Home » Public Forums » GMCnet » [GMCnet] Power Loss Problem
| [GMCnet] Power Loss Problem [message #261212] |
Sun, 07 September 2014 16:43  |
Chris Herron
Messages: 19
Registered: March 2014
Karma: 0
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I took my '73 Sequoia out for the first time today for about a 70 mile trip
each way. On the way down, it did fine. However, on the return it lost
power several times. I was cruising at about 55-60mph. It happened both
with my foot holding steady on the accelerator at cruising speed and also
when trying to accelerate.
The tach seemed to hold steady. The first few times, the loss in power was
just for a second or two. Then it would occur for a longer period, several
seconds or more. The worst time it dropped my speed from 55 to 45, I could
hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
seconds. Any thoughts on what it could be and how to trouble shoot it?
Thanks!
-Chris
73 Sequoia
Dallas, TX
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| Re: [GMCnet] Power Loss Problem [message #261215 is a reply to message #261212] |
Sun, 07 September 2014 17:26  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Sounds like fuel starvation to me. As a start, check/replace all the fuel
filters, not forgetting the superfluous one at the inlet to the carburetor.
Ken H.
On Sun, Sep 7, 2014 at 5:43 PM, Chris Herron wrote:
> I took my '73 Sequoia out for the first time today for about a 70 mile trip
> each way. On the way down, it did fine. However, on the return it lost
> power several times. I was cruising at about 55-60mph. It happened both
> with my foot holding steady on the accelerator at cruising speed and also
> when trying to accelerate.
>
> The tach seemed to hold steady. The first few times, the loss in power
> was
> just for a second or two. Then it would occur for a longer period, several
> seconds or more. The worst time it dropped my speed from 55 to 45, I could
> hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
> seconds. Any thoughts on what it could be and how to trouble shoot it?
> ..
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Power Loss Problem [message #261222 is a reply to message #261212] |
Sun, 07 September 2014 17:57 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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Check to see if the carb bolts are snug. Not too tight, don't crank down on them, just snug.
Sent on a Sprint Samsung Galaxy S® III
-------- Original message --------From: Ken Henderson Date:09/07/2014 5:26 PM (GMT-06:00) To: gmclist Subject: Re: [GMCnet] Power Loss Problem
Sounds like fuel starvation to me. As a start, check/replace all the fuel
filters, not forgetting the superfluous one at the inlet to the carburetor.
Ken H.
On Sun, Sep 7, 2014 at 5:43 PM, Chris Herron wrote:
> I took my '73 Sequoia out for the first time today for about a 70 mile trip
> each way. On the way down, it did fine. However, on the return it lost
> power several times. I was cruising at about 55-60mph. It happened both
> with my foot holding steady on the accelerator at cruising speed and also
> when trying to accelerate.
>
> The tach seemed to hold steady. The first few times, the loss in power
> was
> just for a second or two. Then it would occur for a longer period, several
> seconds or more. The worst time it dropped my speed from 55 to 45, I could
> hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
> seconds. Any thoughts on what it could be and how to trouble shoot it?
> ..
>
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Power Loss Problem [message #261233 is a reply to message #261212] |
Sun, 07 September 2014 19:58 |
Mike Kilroy
Messages: 80
Registered: July 2006
Location: Farmersville, OH (near D...
Karma: 0
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Member |
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Took me 5 yrs to accept why our 73 did that.... unseeabble crack in intake manifold. Had to fill in ex gas channels.... Ask on net about it if u hve the big engine...
Sent from my Verizon Wireless 4G LTE Smartphone
-------- Original message --------From: Ray Erspamer Date:09/07/2014 6:57 PM (GMT-05:00) To: gmclist@temp.gmcnet.org Subject: Re: [GMCnet] Power Loss Problem
Check to see if the carb bolts are snug. Not too tight, don't crank down on them, just snug.
Sent on a Sprint Samsung Galaxy S® III
-------- Original message --------From: Ken Henderson Date:09/07/2014 5:26 PM (GMT-06:00) To: gmclist Subject: Re: [GMCnet] Power Loss Problem
Sounds like fuel starvation to me. As a start, check/replace all the fuel
filters, not forgetting the superfluous one at the inlet to the carburetor.
Ken H.
On Sun, Sep 7, 2014 at 5:43 PM, Chris Herron wrote:
> I took my '73 Sequoia out for the first time today for about a 70 mile trip
> each way. On the way down, it did fine. However, on the return it lost
> power several times. I was cruising at about 55-60mph. It happened both
> with my foot holding steady on the accelerator at cruising speed and also
> when trying to accelerate.
>
> The tach seemed to hold steady. The first few times, the loss in power
> was
> just for a second or two. Then it would occur for a longer period, several
> seconds or more. The worst time it dropped my speed from 55 to 45, I could
> hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
> seconds. Any thoughts on what it could be and how to trouble shoot it?
> ..
>
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Mike (AC8V) & Vickie Kilroy
'73 Canyon Land 26' sidebath
455/ceramic filled crossovers
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| Re: [GMCnet] Power Loss Problem [message #261256 is a reply to message #261222] |
Sun, 07 September 2014 22:22 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ray,
MM says to torque them to 15 ft lb.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ray Erspamer
Sent: Sunday, September 07, 2014 5:57 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Power Loss Problem
Check to see if the carb bolts are snug. Not too tight, don't crank down on them, just snug.
Sent on a Sprint Samsung Galaxy S® III
-------- Original message --------From: Ken Henderson Date:09/07/2014 5:26 PM (GMT-06:00) To: gmclist Subject: Re: [GMCnet] Power Loss Problem
Sounds like fuel starvation to me. As a start, check/replace all the fuel
filters, not forgetting the superfluous one at the inlet to the carburetor.
Ken H.
On Sun, Sep 7, 2014 at 5:43 PM, Chris Herron wrote:
> I took my '73 Sequoia out for the first time today for about a 70 mile trip
> each way. On the way down, it did fine. However, on the return it lost
> power several times. I was cruising at about 55-60mph. It happened both
> with my foot holding steady on the accelerator at cruising speed and also
> when trying to accelerate.
>
> The tach seemed to hold steady. The first few times, the loss in power
> was
> just for a second or two. Then it would occur for a longer period, several
> seconds or more. The worst time it dropped my speed from 55 to 45, I could
> hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
> seconds. Any thoughts on what it could be and how to trouble shoot it?
> ..
>
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Power Loss Problem [message #261272 is a reply to message #261256] |
Mon, 08 September 2014 06:13 |
Jim at the Co-op
Messages: 291
Registered: May 2014
Location: Orlando Florida
Karma: 2
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Senior Member |
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Yes, it does sound like a vacuum related issue in that you said on the way
out it was fine. A crack on the intake may take a while to effect vacuum
until the block really gets hot. As all the metal expands the crack grows
and exhaust gases contaminate the air/fuel mix. Best way to tell is put a
vacuum gauge on the intake manifold. At idle, cold, in park, AC off you
should have @ 18" of vacuum. You should also have this same number hot.
If vacuum is lower when the motor gets really hot or this symptom begins
to happen that's it. When your vacuum drops below 5", the carb will not
suction fuel and air into the heads. You can watch the vacuum gauge and
when you get below 5" the motor will react.
If this is the case, remove the intake manifold, clean it well and look for
the crack between the large secondary port on that thin wall. Be sure
there are no other cracks then with a Mr Gasket 404 fiber intake gasket set
(loose the turkey tray) and a set of stainless steel blockoff plates ,
reinstall the intake, use a new full carb gasket (has only 4 port holes in
it) put it all back together. The intake crack should no longer give you
troubles. We have had 100% success doing this.
May also be a partially clogged carb. fuel filter at the snout of the carb
but in that it took a while I would still do the blockoff deal, it's good
for the motor and one day it WILL crack but you will be ready.
It's what we do all the time,
Jim Bounds
---------------------
On Sun, Sep 7, 2014 at 11:22 PM, Rob Mueller
wrote:
> Ray,
>
> MM says to torque them to 15 ft lb.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> USA '75 Avion - Double Trouble TZE365V100426
> AUS '75 Avion - The Blue Streak TZE365V100428
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:
> gmclist-bounces@temp.gmcnet.org] On Behalf Of Ray Erspamer
> Sent: Sunday, September 07, 2014 5:57 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Power Loss Problem
>
> Check to see if the carb bolts are snug. Not too tight, don't crank down
> on them, just snug.
>
>
> Sent on a Sprint Samsung Galaxy S® III
>
> -------- Original message --------From: Ken Henderson hend4800@bellsouth.net> Date:09/07/2014 5:26 PM (GMT-06:00)
> To: gmclist Subject: Re:
> [GMCnet] Power Loss Problem
> Sounds like fuel starvation to me. As a start, check/replace all
> the fuel
> filters, not forgetting the superfluous one at the inlet to the carburetor.
>
> Ken H.
>
> On Sun, Sep 7, 2014 at 5:43 PM, Chris Herron wrote:
>
>> I took my '73 Sequoia out for the first time today for about a 70 mile
> trip
>> each way. On the way down, it did fine. However, on the return it lost
>> power several times. I was cruising at about 55-60mph. It happened both
>> with my foot holding steady on the accelerator at cruising speed and also
>> when trying to accelerate.
>>
>> The tach seemed to hold steady. The first few times, the loss in power
>> was
>> just for a second or two. Then it would occur for a longer period,
> several
>> seconds or more. The worst time it dropped my speed from 55 to 45, I
> could
>> hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
>> seconds. Any thoughts on what it could be and how to trouble shoot it?
>> ..
>>
> _______________________________________________
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| Re: [GMCnet] Power Loss Problem [message #261274 is a reply to message #261256] |
Mon, 08 September 2014 06:21 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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Thanks Rob. When I had Dick Paterson rebuild my carb he had given me
the number but I couldn't remember it. He mentioned that often people
will crank on the bolts and warp the carb.
On Sun, Sep 7, 2014 at 10:22 PM, Rob Mueller wrote:
> Ray,
>
> MM says to torque them to 15 ft lb.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> USA '75 Avion - Double Trouble TZE365V100426
> AUS '75 Avion - The Blue Streak TZE365V100428
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ray Erspamer
> Sent: Sunday, September 07, 2014 5:57 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Power Loss Problem
>
> Check to see if the carb bolts are snug. Not too tight, don't crank down on them, just snug.
>
>
> Sent on a Sprint Samsung Galaxy S® III
>
> -------- Original message --------From: Ken Henderson Date:09/07/2014 5:26 PM (GMT-06:00) To: gmclist Subject: Re: [GMCnet] Power Loss Problem
> Sounds like fuel starvation to me. As a start, check/replace all the fuel
> filters, not forgetting the superfluous one at the inlet to the carburetor.
>
> Ken H.
>
> On Sun, Sep 7, 2014 at 5:43 PM, Chris Herron wrote:
>
>> I took my '73 Sequoia out for the first time today for about a 70 mile trip
>> each way. On the way down, it did fine. However, on the return it lost
>> power several times. I was cruising at about 55-60mph. It happened both
>> with my foot holding steady on the accelerator at cruising speed and also
>> when trying to accelerate.
>>
>> The tach seemed to hold steady. The first few times, the loss in power
>> was
>> just for a second or two. Then it would occur for a longer period, several
>> seconds or more. The worst time it dropped my speed from 55 to 45, I could
>> hold it steady at 45, but couldn't accelerate beyond that for a good 5-10
>> seconds. Any thoughts on what it could be and how to trouble shoot it?
>> ..
>>
> _______________________________________________
> GMCnet mailing list
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--
Ray Erspamer
78 Royale - "The Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMCRoyale@gmail.com
414-484-9431
Web Site: http://ray-lisa.page.tl/
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Power Loss Problem [message #261276 is a reply to message #261272] |
Mon, 08 September 2014 06:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Jim at the Co-op wrote on Mon, 08 September 2014 06:13Yes, it does sound like a vacuum related issue in that you said on the way
out it was fine. A crack on the intake may take a while to effect vacuum
until the block really gets hot. As all the metal expands the crack grows
and exhaust gases contaminate the air/fuel mix. Best way to tell is put a
vacuum gauge on the intake manifold. At idle, cold, in park, AC off you
should have @ 18" of vacuum. You should also have this same number hot.
If vacuum is lower when the motor gets really hot or this symptom begins
to happen that's it. When your vacuum drops below 5", the carb will not
suction fuel and air into the heads. You can watch the vacuum gauge and
when you get below 5" the motor will react.
If this is the case, remove the intake manifold, clean it well and look for
the crack between the large secondary port on that thin wall. Be sure
there are no other cracks then with a Mr Gasket 404 fiber intake gasket set
(loose the turkey tray) and a set of stainless steel blockoff plates ,
reinstall the intake, use a new full carb gasket (has only 4 port holes in
it) put it all back together. The intake crack should no longer give you
troubles. We have had 100% success doing this.
May also be a partially clogged carb. fuel filter at the snout of the carb
but in that it took a while I would still do the blockoff deal, it's good
for the motor and one day it WILL crack but you will be ready.
It's what we do all the time,
Jim Bounds
---------------------
Jim,
Add to that a new gasket for the choke heater and a choke heater block off plate on the intake manifold. I realize that crossover chamber is now dead air space with the blocking plates in, but I still feel that these still should be changed / upgraded. It is only two bolts to do it. I assume you sell these and I know Jim K does.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Power Loss Problem [message #261361 is a reply to message #261276] |
Tue, 09 September 2014 05:43 |
Jim at the Co-op
Messages: 291
Registered: May 2014
Location: Orlando Florida
Karma: 2
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Senior Member |
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If Jim K. has them call him. Yes, even though the original choke is not
being used still I would not want "stuff" to get in there. Be prepared to
have to drill & tap the holes, seems many times those 2 bolts are rusted in
place. If the gasket is really bad we will pull it all down but if it
looks clean and stable we will leave it there. I mean time to drill and
tap is something we don't have to charge if we don't have to do it. But
yes, you do need to address that gasket.
Jim Bounds
----------------
On Mon, Sep 8, 2014 at 7:42 AM, Ken Burton wrote:
> Jim at the Co-op wrote on Mon, 08 September 2014 06:13
>> Yes, it does sound like a vacuum related issue in that you said on the
> way
>> out it was fine. A crack on the intake may take a while to effect vacuum
>> until the block really gets hot. As all the metal expands the crack
> grows
>> and exhaust gases contaminate the air/fuel mix. Best way to tell is put
> a
>> vacuum gauge on the intake manifold. At idle, cold, in park, AC off you
>> should have @ 18" of vacuum. You should also have this same number hot.
>> If vacuum is lower when the motor gets really hot or this symptom begins
>> to happen that's it. When your vacuum drops below 5", the carb will not
>> suction fuel and air into the heads. You can watch the vacuum gauge and
>> when you get below 5" the motor will react.
>>
>> If this is the case, remove the intake manifold, clean it well and look
> for
>> the crack between the large secondary port on that thin wall. Be sure
>> there are no other cracks then with a Mr Gasket 404 fiber intake gasket
> set
>> (loose the turkey tray) and a set of stainless steel blockoff plates ,
>> reinstall the intake, use a new full carb gasket (has only 4 port holes
> in
>> it) put it all back together. The intake crack should no longer give you
>> troubles. We have had 100% success doing this.
>>
>> May also be a partially clogged carb. fuel filter at the snout of the
> carb
>> but in that it took a while I would still do the blockoff deal, it's good
>> for the motor and one day it WILL crack but you will be ready.
>>
>> It's what we do all the time,
>>
>> Jim Bounds
>> ---------------------
>
> Jim,
> Add to that a new gasket for the choke heater and a choke heater block off
> plate on the intake manifold. I realize that crossover chamber is now dead
> air space with the blocking plates in, but I still feel that these still
> should be changed / upgraded. It is only two bolts to do it. I assume you
> sell these and I know Jim K does.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Power Loss Problem [message #261368 is a reply to message #261361] |
Tue, 09 September 2014 07:14 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Jim at the Co-op wrote on Tue, 09 September 2014 05:43If Jim K. has them call him. Yes, even though the original choke is not
being used still I would not want "stuff" to get in there. Be prepared to
have to drill & tap the holes, seems many times those 2 bolts are rusted in
place. If the gasket is really bad we will pull it all down but if it
looks clean and stable we will leave it there. I mean time to drill and
tap is something we don't have to charge if we don't have to do it. But
yes, you do need to address that gasket.
Jim Bounds
----------------
If they look bad, I would soak them for 4 or 5 days with Kroil before attempting to take them out. Mine came right with out soaking them.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Power Loss Problem [message #261370 is a reply to message #261368] |
Tue, 09 September 2014 07:42 |
Jim at the Co-op
Messages: 291
Registered: May 2014
Location: Orlando Florida
Karma: 2
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Senior Member |
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Can happen, taking the time to do that can make a difference. The question
is not "what to do" rather "where to stop". If the original gasket is not
really messed up we leave it, if you like replacing it cannot hurt. Just
one of those decisions someone has to make.
Jim Bounds
-------------------------
On Tue, Sep 9, 2014 at 8:14 AM, Ken Burton wrote:
> Jim at the Co-op wrote on Tue, 09 September 2014 05:43
>> If Jim K. has them call him. Yes, even though the original choke is not
>> being used still I would not want "stuff" to get in there. Be prepared
> to
>> have to drill & tap the holes, seems many times those 2 bolts are rusted
> in
>> place. If the gasket is really bad we will pull it all down but if it
>> looks clean and stable we will leave it there. I mean time to drill and
>> tap is something we don't have to charge if we don't have to do it. But
>> yes, you do need to address that gasket.
>>
>> Jim Bounds
>> ----------------
>> If they look bad, I would soak them for 4 or 5 days with Kroil before
> attempting to take them out. Mine came right with out soaking them.
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
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| Re: [GMCnet] Power Loss Problem [message #261699 is a reply to message #261382] |
Fri, 12 September 2014 14:33 |
Mike Kilroy
Messages: 80
Registered: July 2006
Location: Farmersville, OH (near D...
Karma: 0
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Been a while since I posted. my 9/7 post did not go thru. perhaps this
one will?
From: mike
Date:09/07/2014 8:58 PM (GMT-05:00)
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Power Loss Problem
Took me 5 yrs to accept why our 73 did that.... unsee-able crack in
intake manifold; needed magna flux to find it. Had to fill in exhaust
gas channels.... Ask on net about it if u have the big engine - it
is/was very common problem and causes what you experience...
On 9/9/2014 9:46 AM, Chris Herron wrote:
> Thanks for the tips, everyone. I'll report back what I find...
>
> -Chris
> 73 Sequoia
> Dallas, TX
>
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Mike (AC8V) & Vickie Kilroy
'73 Canyon Land 26' sidebath
455/ceramic filled crossovers
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| [GMCnet] Fwd: Re: Power Loss Problem [message #261769 is a reply to message #261699] |
Sat, 13 September 2014 09:45 |
Mike Kilroy
Messages: 80
Registered: July 2006
Location: Farmersville, OH (near D...
Karma: 0
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try sending again....
Been a while since I posted. my 9/7 post did not go thru. perhaps this
one will?
From: mike
Date:09/07/2014 8:58 PM (GMT-05:00)
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Power Loss Problem
Took me 5 yrs to accept why our 73 did that.... unsee-able crack in
intake manifold; needed magna flux to find it. Had to fill in exhaust
gas channels.... Ask on net about it if u have the big engine - it
is/was very common problem and causes what you experience...
On 9/9/2014 9:46 AM, Chris Herron wrote:
> Thanks for the tips, everyone. I'll report back what I find...
>
> -Chris
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Mike (AC8V) & Vickie Kilroy
'73 Canyon Land 26' sidebath
455/ceramic filled crossovers
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