Home » Public Forums » GMCnet » [GMCnet] Losing Power
| [GMCnet] Losing Power [message #294171] |
Fri, 22 January 2016 16:16  |
bdub
Messages: 1578
Registered: February 2004
Location: Central Texas
Karma: 5
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Senior Member |
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A friend is having his "new to him" '76 Birchaven driven from Chattanooga,
TN to Detroit, MI. The driver is in Richmond, KY and says it won't go any
faster than 30 mph. . It started out pulling hills like a champ and
gradually became anemic.
Shop there says there is a knock that sounds like a rocker arm
Does this make sense?
I imagined a fuel filter at first, but didn't know about the "knock".
Looking for opinions.
bdub
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bdub
'76 Palm Beach/Central Texas
www.bdub.net
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| Re: [GMCnet] Losing Power [message #294174 is a reply to message #294172] |
Fri, 22 January 2016 16:31  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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First replace the fuel filter and check if there are other fuel filters in
the system and also replace the tank selector switch if it has not been
done recently, as the rubber in it is being attacked by Ethanol.
Also the fuel pump if older one need to be replaced as the rubber diaphram
is going out.
After that the power should be up and the check the knocking noise.
On Fri, Jan 22, 2016 at 2:20 PM, D C _Mac_ Macdonald
wrote:
> Loss of cooling may cause lack of pull AND knock.
>
> Don't ask.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ Since 30 November '53 ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ Member GMCMI and Classics ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~~ k2gkk + hotmail dot com ~~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ______________
> |[ ]~~~[][ ][]\
> "--OO--[]---O-"
>
>
>
>> From: bdub@bdub.net
>> To: gmclist@list.gmcnet.org
>> Date: Fri, 22 Jan 2016 16:16:08 -0600
>> Subject: [GMCnet] Losing Power
>>
>> A friend is having his "new to him" '76 Birchaven driven from
> Chattanooga,
>> TN to Detroit, MI. The driver is in Richmond, KY and says it won't go
> any
>> faster than 30 mph. . It started out pulling hills like a champ and
>> gradually became anemic.
>>
>> Shop there says there is a knock that sounds like a rocker arm
>>
>> Does this make sense?
>>
>>
>>
>> I imagined a fuel filter at first, but didn't know about the "knock".
>>
>>
>>
>> Looking for opinions.
>>
>> bdub
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Losing Power [message #294175 is a reply to message #294171] |
Fri, 22 January 2016 17:09 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Loss of power on hills usually relates to ignition advance. The weights begin to hang up.
Overall loss more likely fuel.
If a rocker is knocking -- loss of one cylinder is usually not that detrimental to power. Checking the driver side is reasonably easy. The rocker bridges have been known to break.
Dennis
bdub wrote on Fri, 22 January 2016 16:16A friend is having his "new to him" '76 Birchaven driven from Chattanooga,
TN to Detroit, MI. The driver is in Richmond, KY and says it won't go any
faster than 30 mph. . It started out pulling hills like a champ and
gradually became anemic.
Shop there says there is a knock that sounds like a rocker arm
Does this make sense?
I imagined a fuel filter at first, but didn't know about the "knock".
Looking for opinions.
bdub
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Losing Power [message #294177 is a reply to message #294174] |
Fri, 22 January 2016 17:08 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Senior Member |
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Depending on temperatures, if it's freezing or close to it, dump in a
bottle of gas line antifreeze. Should be less than $5 and may help get rid
of any ice and or water...
Mike in NS
On Fri, Jan 22, 2016 at 6:31 PM, Jim Kanomata wrote:
> First replace the fuel filter and check if there are other fuel filters in
> the system and also replace the tank selector switch if it has not been
> done recently, as the rubber in it is being attacked by Ethanol.
> Also the fuel pump if older one need to be replaced as the rubber diaphram
> is going out.
> After that the power should be up and the check the knocking noise.
>
> On Fri, Jan 22, 2016 at 2:20 PM, D C _Mac_ Macdonald
> wrote:
>
>> Loss of cooling may cause lack of pull AND knock.
>>
>> Don't ask.
>>
>> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>> ~~ ~ D C "Mac" Macdonald ~ ~~
>> ~ ~ Amateur Radio - K2GKK ~ ~
>> ~ ~ Since 30 November '53 ~ ~
>> ~ ~ USAF and FAA, Retired ~ ~
>> ~ Member GMCMI and Classics ~
>> ~ ~ ~ Oklahoma City, OK ~ ~ ~
>> ~~ ~ ~ "The Money Pit" ~ ~ ~~
>> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
>> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
>> ~~ k2gkk + hotmail dot com ~~
>> ~ www.gmcmhphotos.com/okclb ~
>> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>> ______________
>> |[ ]~~~[][ ][]\
>> "--OO--[]---O-"
>>
>>
>>
>>> From: bdub@bdub.net
>>> To: gmclist@list.gmcnet.org
>>> Date: Fri, 22 Jan 2016 16:16:08 -0600
>>> Subject: [GMCnet] Losing Power
>>>
>>> A friend is having his "new to him" '76 Birchaven driven from
>> Chattanooga,
>>> TN to Detroit, MI. The driver is in Richmond, KY and says it won't go
>> any
>>> faster than 30 mph. . It started out pulling hills like a champ and
>>> gradually became anemic.
>>>
>>> Shop there says there is a knock that sounds like a rocker arm
>>>
>>> Does this make sense?
>>>
>>>
>>>
>>> I imagined a fuel filter at first, but didn't know about the "knock".
>>>
>>>
>>>
>>> Looking for opinions.
>>>
>>> bdub
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
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| Re: [GMCnet] Losing Power [message #294181 is a reply to message #294174] |
Fri, 22 January 2016 18:00 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Smell the oil for gas and maybe looks to thin? A ruptured fuel pump could thin the oil and make a lifter tap and lose fuel pressure. What Jim says about the filters and if you can remove the gas cap and blow shop air back into tanks to clear pick ups. In my case the reason I had to replace the fuel pump and change oil and filter in AZ parking lot was the old pump was trying to pull thru plugged up filters and pick ups. I did have a air line.
jimk wrote on Fri, 22 January 2016 17:31First replace the fuel filter and check if there are other fuel filters in
the system and also replace the tank selector switch if it has not been
done recently, as the rubber in it is being attacked by Ethanol.
Also the fuel pump if older one need to be replaced as the rubber diaphram
is going out.
After that the power should be up and the check the knocking noise.
On Fri, Jan 22, 2016 at 2:20 PM, D C _Mac_ Macdonald
wrote:
> Loss of cooling may cause lack of pull AND knock.
>
> Don't ask.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ Since 30 November '53 ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ Member GMCMI and Classics ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~~ k2gkk + hotmail dot com ~~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ______________
> |[ ]~~~[][ ][]\
> "--OO--[]---O-"
>
>
>
>> From: bdub@bdub.net
>> To: gmclist@list.gmcnet.org
>> Date: Fri, 22 Jan 2016 16:16:08 -0600
>> Subject: [GMCnet] Losing Power
>>
>> A friend is having his "new to him" '76 Birchaven driven from
> Chattanooga,
>> TN to Detroit, MI. The driver is in Richmond, KY and says it won't go
> any
>> faster than 30 mph. . It started out pulling hills like a champ and
>> gradually became anemic.
>>
>> Shop there says there is a knock that sounds like a rocker arm
>>
>> Does this make sense?
>>
>>
>>
>> I imagined a fuel filter at first, but didn't know about the "knock".
>>
>>
>>
>> Looking for opinions.
>>
>> bdub
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Losing Power [message #294183 is a reply to message #294171] |
Fri, 22 January 2016 19:04 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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bdub wrote on Fri, 22 January 2016 17:16A friend is having his "new to him" '76 Birchaven driven from Chattanooga,
TN to Detroit, MI. The driver is in Richmond, KY and says it won't go any
faster than 30 mph. . It started out pulling hills like a champ and
gradually became anemic.
Shop there says there is a knock that sounds like a rocker arm
Does this make sense?
I imagined a fuel filter at first, but didn't know about the "knock".
Looking for opinions.
bdub
Billy,
For all but the ticking, this does fit fuel filter, or at least a lack of fuel delivery.
With the amount of alcohol in fuel, there is almost no chance of fuel line freeze.
It is very possible that the shake of finally being driven has loosened some debris in the tanks. If it is the pickup socks, he will have to blow back through the fuel line before (flow relative) the pump.
I hope he has tools, I would first go after the carburetor filter. That is almost impossible to service without removing the carburetor enough to get the steel fuel line clear. It takes a big wrench to get the filter out of the carburetor and the filter flows inside to out, so you can't visually inspect it. Just replace it. Have him call someone to talk him through this if he has never done it. (Yes, I am volunteering to be that guy.)
If our new friend can get as far north as Ohio, I can be with him in four hours.
Does he have a black list?
Give him my contact info. anyway. If he is coming my way, we can stand by until he is where he needs to be (or in my drive not far off I-275).
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Losing Power [message #294186 is a reply to message #294171] |
Fri, 22 January 2016 20:17 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
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Senior Member |
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A cracked intake under the carb can make it run bad once warm as well.
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: [GMCnet] Losing Power [message #294188 is a reply to message #294171] |
Fri, 22 January 2016 21:35 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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bdub wrote on Fri, 22 January 2016 15:16A friend is having his "new to him" '76 Birchaven driven from Chattanooga,
TN to Detroit, MI. The driver is in Richmond, KY and says it won't go any
faster than 30 mph. . It started out pulling hills like a champ and
gradually became anemic.
Shop there says there is a knock that sounds like a rocker arm
Does this make sense?
I imagined a fuel filter at first, but didn't know about the "knock".
Looking for opinions.
bdub
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A knock can have many interpretations but it ominously sounds like the end of the engine.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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