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| Engine trouble [message #366680] |
Fri, 10 September 2021 17:38  |
Jimmy_Bonez
Messages: 105
Registered: September 2017
Location: NH
Karma: 0
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Senior Member |
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Hello gentlemen,
Need a little trouble shooting. Camper broke down today on the way to our last trip of the season. Driving fine then all of sudden two backfires and engine shut down. Coasted to a stop on the side of the road. Had minimal tools to diagnose anything. After pulling over tried to crank engine over again and nothing. Did check for spark which we had. Didn’t get a chance to check if we were getting fuel. Pregnant wife and a nice sheriff had the rig on truck and towing it back home before I had a chance to mess around with it anymore. Any chance it would be fuel? Working with remanded S&J engine. No upgrades or anything.
Jim DeMellia and Jen Radefeld and our cat Ickis
NH natives
1975 GMC “Palm Beach” ,455, her names Linda
Full time RVers exploring the beautiful and unusual parts of the country.
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| Re: Engine trouble [message #366682 is a reply to message #366680] |
Fri, 10 September 2021 18:06  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Jimmy_Bonez wrote on Fri, 10 September 2021 18:38Hello gentlemen,
Need a little trouble shooting. Camper broke down today on the way to our last trip of the season. Driving fine then all of sudden two backfires and engine shut down. Coasted to a stop on the side of the road. Had minimal tools to diagnose anything. After pulling over tried to crank engine over again and nothing. Did check for spark which we had. Didn’t get a chance to check if we were getting fuel. Pregnant wife and a nice sheriff had the rig on truck and towing it back home before I had a chance to mess around with it anymore. Any chance it would be fuel? Working with remanded S&J engine. No upgrades or anything.
Jimmy,
Many of us have been there.
As it is a 75 and hence HEI, that would be my first checks, but you say you had spark.
Unfortunately, with HEI, it can recover in the time it takes you to get to the engine room. (BTDT, but not my coach)
So, in the morning run the whole diagnostic and if you still have questions, we are here to help.
Sudden shutdowns are common on HEI failures. This is why I suggest that all carry the complete kit. It is not difficult to install, but I have seen every single part fail (module, pick-up and coil) These are not big or expensive parts and do not require special tools.
Sudden shutdowns can happen with fuel system failures, but they are not common. They are usually proceeded by a succinct loss of power. You did not mention that. So, in the morning go out and pop the air filter and stroke the throttle and see if the accelerator pump spits fuel.
With a recent rebuild, it doesn't sound bad.
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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| [GMCnet] Re: Engine trouble [message #366686 is a reply to message #366682] |
Fri, 10 September 2021 19:38 |
Jimmy_Bonez
Messages: 105
Registered: September 2017
Location: NH
Karma: 0
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Senior Member |
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Thanks for the responses. Small update. Noticed fuel leaking to the back of the coach when it was on the hook. Can’t find the leak yet while it’s sitting on level ground.
Sent from my iPhone
> On Sep 10, 2021, at 7:07 PM, Matt Colie wrote:
>
> Jimmy_Bonez wrote on Fri, 10 September 2021 18:38
>> Hello gentlemen,
>> Need a little trouble shooting. Camper broke down today on the way to our last trip of the season. Driving fine then all of sudden two
>> backfires and engine shut down. Coasted to a stop on the side of the road. Had minimal tools to diagnose anything. After pulling over tried to crank
>> engine over again and nothing. Did check for spark which we had. Didn’t get a chance to check if we were getting fuel. Pregnant wife and a nice
>> sheriff had the rig on truck and towing it back home before I had a chance to mess around with it anymore. Any chance it would be fuel? Working
>> with remanded S&J engine. No upgrades or anything.
>
> Jimmy,
>
> Many of us have been there.
> As it is a 75 and hence HEI, that would be my first checks, but you say you had spark.
> Unfortunately, with HEI, it can recover in the time it takes you to get to the engine room. (BTDT, but not my coach)
> So, in the morning run the whole diagnostic and if you still have questions, we are here to help.
>
> Sudden shutdowns are common on HEI failures. This is why I suggest that all carry the complete kit. It is not difficult to install, but I have seen
> every single part fail (module, pick-up and coil) These are not big or expensive parts and do not require special tools.
>
> Sudden shutdowns can happen with fuel system failures, but they are not common. They are usually proceeded by a succinct loss of power. You did not
> mention that. So, in the morning go out and pop the air filter and stroke the throttle and see if the accelerator pump spits fuel.
>
> With a recent rebuild, it doesn't sound bad.
>
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim DeMellia and Jen Radefeld and our cat Ickis
NH natives
1975 GMC “Palm Beach” ,455, her names Linda
Full time RVers exploring the beautiful and unusual parts of the country.
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| [GMCnet] Re: Engine trouble [message #366689 is a reply to message #366686] |
Fri, 10 September 2021 21:07 |
Randy Hecht
Messages: 93
Registered: March 2019
Location: Roswell, GA
Karma: -5
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Member |
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Look at hose and clamps
Randy Hecht
Roswell, GA
1974 Canyon Lands GMC Motor-coach
> On Sep 10, 2021, at 19:38, Jim DeMellia wrote:
>
> Thanks for the responses. Small update. Noticed fuel leaking to the back of the coach when it was on the hook. Can’t find the leak yet while it’s sitting on level ground.
>
> Sent from my iPhone
>
>> On Sep 10, 2021, at 7:07 PM, Matt Colie wrote:
>>
>> Jimmy_Bonez wrote on Fri, 10 September 2021 18:38
>>> Hello gentlemen,
>>> Need a little trouble shooting. Camper broke down today on the way to our last trip of the season. Driving fine then all of sudden two
>>> backfires and engine shut down. Coasted to a stop on the side of the road. Had minimal tools to diagnose anything. After pulling over tried to crank
>>> engine over again and nothing. Did check for spark which we had. Didn’t get a chance to check if we were getting fuel. Pregnant wife and a nice
>>> sheriff had the rig on truck and towing it back home before I had a chance to mess around with it anymore. Any chance it would be fuel? Working
>>> with remanded S&J engine. No upgrades or anything.
>>
>> Jimmy,
>>
>> Many of us have been there.
>> As it is a 75 and hence HEI, that would be my first checks, but you say you had spark.
>> Unfortunately, with HEI, it can recover in the time it takes you to get to the engine room. (BTDT, but not my coach)
>> So, in the morning run the whole diagnostic and if you still have questions, we are here to help.
>>
>> Sudden shutdowns are common on HEI failures. This is why I suggest that all carry the complete kit. It is not difficult to install, but I have seen
>> every single part fail (module, pick-up and coil) These are not big or expensive parts and do not require special tools.
>>
>> Sudden shutdowns can happen with fuel system failures, but they are not common. They are usually proceeded by a succinct loss of power. You did not
>> mention that. So, in the morning go out and pop the air filter and stroke the throttle and see if the accelerator pump spits fuel.
>>
>> With a recent rebuild, it doesn't sound bad.
>>
>> 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
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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| [GMCnet] Re: Engine trouble [message #366691 is a reply to message #366689] |
Fri, 10 September 2021 22:25 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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l leak is possibly from the fuel level sensor on top of the tank .
That should have nothing to do with the engine issue.
If your going to replace the coil or module, replace both as One can ruin
the other .
On Fri, Sep 10, 2021 at 7:07 PM Randy Hecht wrote:
> Look at hose and clamps
>
> Randy Hecht
> Roswell, GA
>
> 1974 Canyon Lands GMC Motor-coach
>
>
>> On Sep 10, 2021, at 19:38, Jim DeMellia
> wrote:
>>
>> Thanks for the responses. Small update. Noticed fuel leaking to the
> back of the coach when it was on the hook. Can’t find the leak yet while
> it’s sitting on level ground.
>>
>> Sent from my iPhone
>>
>>> On Sep 10, 2021, at 7:07 PM, Matt Colie wrote:
>>>
>>> Jimmy_Bonez wrote on Fri, 10 September 2021 18:38
>>>> Hello gentlemen,
>>>> Need a little trouble shooting. Camper broke down today on the way
> to our last trip of the season. Driving fine then all of sudden two
>>>> backfires and engine shut down. Coasted to a stop on the side of the
> road. Had minimal tools to diagnose anything. After pulling over tried to
> crank
>>>> engine over again and nothing. Did check for spark which we had.
> Didn’t get a chance to check if we were getting fuel. Pregnant wife and a
> nice
>>>> sheriff had the rig on truck and towing it back home before I had a
> chance to mess around with it anymore. Any chance it would be fuel? Working
>>>> with remanded S&J engine. No upgrades or anything.
>>>
>>> Jimmy,
>>>
>>> Many of us have been there.
>>> As it is a 75 and hence HEI, that would be my first checks, but you say
> you had spark.
>>> Unfortunately, with HEI, it can recover in the time it takes you to get
> to the engine room. (BTDT, but not my coach)
>>> So, in the morning run the whole diagnostic and if you still have
> questions, we are here to help.
>>>
>>> Sudden shutdowns are common on HEI failures. This is why I suggest
> that all carry the complete kit. It is not difficult to install, but I
> have seen
>>> every single part fail (module, pick-up and coil) These are not big or
> expensive parts and do not require special tools.
>>>
>>> Sudden shutdowns can happen with fuel system failures, but they are not
> common. They are usually proceeded by a succinct loss of power. You did
> not
>>> mention that. So, in the morning go out and pop the air filter and
> stroke the throttle and see if the accelerator pump spits fuel.
>>>
>>> With a recent rebuild, it doesn't sound bad.
>>>
>>> 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
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Engine trouble [message #366694 is a reply to message #366680] |
Sat, 11 September 2021 01:29 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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There are probably 10 things we could guess at. So with an instant stop without any missing or reduced power before that, I am going to guess it is electrical and probably ignition failure. Maybe the module. I can think if a lot of mechanical problems too. If you think it is fuel. Take off the air cleaner lid and look down the throat of the carb while you step on the gas a couple of times.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Engine trouble [message #366963 is a reply to message #366680] |
Sun, 26 September 2021 10:10 |
Jimmy_Bonez
Messages: 105
Registered: September 2017
Location: NH
Karma: 0
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Senior Member |
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Well gentlemen finally got a chance to work on the camper. Swapped out the ignition parts that Mr. Colie suggested. I swapped out the module, pick-up and coil. Low and behold she fired right up. Now when I pulled the distributor to replace the pickup coil and reinstalled I was sure to mark everything as to line it back up with the reinstall. Now when I start it up it feels like it grabs “hard” when I start it up. It fires up every time I go to start it up but not sure what is going on with startup now. Could I have advanced the timing on the distributor when reinstalling it just enough for it have that feeling of grabbing more aggressively at startup.
Thanks again for the help
Jim DeMellia and Jen Radefeld and our cat Ickis
NH natives
1975 GMC “Palm Beach” ,455, her names Linda
Full time RVers exploring the beautiful and unusual parts of the country.
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| Re: Engine trouble [message #366967 is a reply to message #366682] |
Sun, 26 September 2021 12:10 |
boybach
Messages: 566
Registered: December 2020
Location: Vancouver Island
Karma: 4
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Senior Member |
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[quote title=Matt Colie wrote on Fri, 10 September 2021 16:06]Jimmy_Bonez wrote on Fri, 10 September 2021 18:38
Sudden shutdowns are common on HEI failures. This is why I suggest that all carry the complete kit. It is not difficult to install, but I have seen every single part fail (module, pick-up and coil) These are not big or expensive parts and do not require special tools.
Matt
Matt, Sounds like I need a spares kit for my '77 coach with the 403 and HEI setup.
Just wondering - would I order the 77 Olds Toronado parts?
Was looking at Rock Auto just now and looking at the three parts you recommended (module, pick-up and coil), do I need any other parts or are these enough?
TIA
Larry
Larry - Victoria BC -
1977 ex-Palm Beach "Ol' Leaky" 40,000 miles, PO said everything working but forgot the word NOT. Atwood helium fridge, water heater & furnace. SS exhaust system, Onan, Iota Converter, R134A, New fuel lines & heat exchange hoses
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| [GMCnet] Re: Engine trouble [message #366969 is a reply to message #366967] |
Sun, 26 September 2021 12:36 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Larry
I am going to share something with you that I have learned over the years.
Genuine GM parts are different than "white box" or "tan box" parts. The
internal components are of a higher tolerance and are more voltage spike
resistant than the other aftermarket stuff is. Nowhere is it more
noticeable than it is in modules.and coils and alternator regulators. I am
a GM trained technician, and there is a reason why genuine GM stuff is
expensive. It is better. GMC motorhomes are all 40 plus years old and their
electrical stuff is loose and corroded from weather and time. Voltage
spikes are common.
But, it is your hard earned money that you are spending. Just spend it
once for the same stuff.
Jim Hupy
Salem, Oregon
On Sun, Sep 26, 2021, 10:10 AM wrote:
> [quote title=Matt Colie wrote on Fri, 10 September 2021 16:06]Jimmy_Bonez
> wrote on Fri, 10 September 2021 18:38
>> Sudden shutdowns are common on HEI failures. This is why I suggest that
> all carry the complete kit. It is not difficult to install, but I have
>> seen every single part fail (module, pick-up and coil) These are not
> big or expensive parts and do not require special tools.
>>
>> Matt
>
> Matt, Sounds like I need a spares kit for my '77 coach with the 403 and
> HEI setup.
>
> Just wondering - would I order the 77 Olds Toronado parts?
>
> Was looking at Rock Auto just now and looking at the three parts you
> recommended (module, pick-up and coil), do I need any other parts or are
> these
> enough?
>
> TIA
>
> Larry
> --
> Larry - Victoria BC -
>
> 1977 Palm Beach 40,000 miles, PO said everything working but forgot the
> word NOT. New Atwood fridge, water heater & furnace. New SS exhaust system,
> 6000w Onan, Iota Converter, R134A A/C, New fuel lines & heat exchange hoses
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| Re: Engine trouble [message #366980 is a reply to message #366680] |
Mon, 27 September 2021 10:25 |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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While replacing the timing chain (and a lot of other stuff) on mine earlier this year, I discovered the mechanical advance was frozen. After soaking the top of the shaft with Kroil for a couple of days, it freed up.
There was a noticeable increase in power on our first trip since the maintenance this week, probably some from the replacement of the very loose timing chain, and the rest from having a mechanical advance actually working. The pins and weights on my advance are very worn, and I am going to send another distributor to Dick Paterson for a rebuild.
If you haven't already done so, you should replace the timing chain and check the advance for proper operation.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| [GMCnet] Re: Engine trouble [message #366991 is a reply to message #366980] |
Mon, 27 September 2021 16:50 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Or spend the kid’s inheritance and install the Howell EFI with electronic distributor and EBL!
Larry Davick
1976 Palm Beach
> On Sep 27, 2021, at 8:48 AM, Greg Crawford wrote:
>
> While replacing the timing chain (and a lot of other stuff) on mine earlier this year, I discovered the mechanical advance was frozen. After soaking
> the top of the shaft with Kroil for a couple of days, it freed up.
>
> There was a noticeable increase in power on our first trip since the maintenance this week, probably some from the replacement of the very loose
> timing chain, and the rest from having a mechanical advance actually working. The pins and weights on my advance are very worn, and I am going to send
> another distributor to Dick Paterson for a rebuild.
>
> If you haven't already done so, you should replace the timing chain and check the advance for proper operation.
> --
> Greg Crawford
> KM4ZCR
> Knoxville, TN
>
> "Ruby Sue"
> 1977 Royale
> Rear Bath
> 403 Engine
> American Eagle Wheels
> Early Version Alex Sirum Quad bags
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Re: Engine trouble [message #366993 is a reply to message #366991] |
Mon, 27 September 2021 18:51 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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You were fortunate. The rusted weights sometimes stick partially advanced. I have seen a few that wore the weight pivot point holes and the pins badly. I have a Dick Paterson rebuilt distributor and he puts a very small spot of grease on those points during rebuild. I checked mine after 15 years and the points were still lubed beautifully.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| [GMCnet] Re: Engine trouble [message #366994 is a reply to message #366993] |
Mon, 27 September 2021 23:33 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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I suspect a bad coil or module.
On Mon, Sep 27, 2021 at 4:51 PM Ken Burton wrote:
> You were fortunate. The rusted weights sometimes stick partially
> advanced. I have seen a few that wore the weight pivot point holes and the
> pins
> badly. I have a Dick Paterson rebuilt distributor and he puts a very
> small spot of grease on those points during rebuild. I checked mine after
> 15
> years and the points were still lubed beautifully.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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