Home » Public Forums » GMCnet » [GMCnet] Stall when revving.
| [GMCnet] Stall when revving. [message #258599] |
Tue, 12 August 2014 14:12  |
Daniel DeLuca
Messages: 120
Registered: June 2014
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Hello,
The coach is still up on blocks, but with most major mechanical work done, I am waiting on the tires before taking it for its first spin. One source of frustration has been the many different ways the car idles when I start it. Recently, the coach has been idling well but when given gas the engine cuts out at about 3,000 rpm and returns to idle. If I keep my foot on the gas it will cut out. There is a little hesitation before it starts to rev.
The problems seems to go away when the engine is fully warmed. Also, I think the engine is running a little rich.
Any ideas? I could adjust the float level, but I would rather not take the carb apart again.
Dan
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| Re: [GMCnet] Stall when revving. [message #258604 is a reply to message #258599] |
Tue, 12 August 2014 15:24  |
emerystora
Messages: 4442
Registered: January 2004
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Yes, they can have a leaky bowl and years ago when I still used a carb I sealed under the bowl with epoxy but I still had the same problem. I finally decided that it was gasoline evaporating out of the carb chamber due to the high temperature of the motor and the motor box. I could smell strong fumes when I would open the engine cover. Not much you can do about this. When you go to start again you have to crank a lot to fill the float chamber with fuel.
Emery Stora
On Aug 12, 2i014, at 2:21 PM, Daniel DeLuca wrote:
> Hey Everyone,
>
> I just realized that every time the engine does this it is after it has been sitting for a week or so. When the engine sits, it takes a it of cranking (10 -15 seconds) to get it started. I have heard that these carbs can have leaky bowls. Could the cranking waiting for bowl to fill be causing a “flooded” state? Leading to these symptoms. I let the motorhome cool off for a few hours and just started it again and she rain perfectly.
>
> Dan
> On Aug 12, 2014, at 3:34 PM, Daniel DeLuca wrote:
>
>> If i keep my foot on the gas the engine stalls.
>>
>> On Aug 12, 2014, at 3:28 PM, A. wrote:
>>
>>> Daniel DeLuca wrote on Tue, 12 August 2014 14:12
>>>> ... If I keep my foot on the gas it will cut out. ...
>>> Does that mean it dies, it recovers and revs like it is supposed to, or it runs at idle RPM with the throttle open????
>>> --
>>> '73 23' Sequoia For Sale
>>> '73 23' CanyonLands For Sale
>>> Upper Alabama
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| Re: [GMCnet] Stall when revving. [message #258605 is a reply to message #258601] |
Tue, 12 August 2014 15:21 |
Daniel DeLuca
Messages: 120
Registered: June 2014
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Hey Everyone,
I just realized that every time the engine does this it is after it has been sitting for a week or so. When the engine sits, it takes a it of cranking (10 -15 seconds) to get it started. I have heard that these carbs can have leaky bowls. Could the cranking waiting for bowl to fill be causing a “flooded” state? Leading to these symptoms. I let the motorhome cool off for a few hours and just started it again and she rain perfectly.
Dan
On Aug 12, 2014, at 3:34 PM, Daniel DeLuca wrote:
> If i keep my foot on the gas the engine stalls.
>
> On Aug 12, 2014, at 3:28 PM, A. wrote:
>
>> Daniel DeLuca wrote on Tue, 12 August 2014 14:12
>>> ... If I keep my foot on the gas it will cut out. ...
>> Does that mean it dies, it recovers and revs like it is supposed to, or it runs at idle RPM with the throttle open????
>> --
>> '73 23' Sequoia For Sale
>> '73 23' CanyonLands For Sale
>> Upper Alabama
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Stall when revving. [message #258606 is a reply to message #258599] |
Tue, 12 August 2014 15:21 |
emerystora
Messages: 4442
Registered: January 2004
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If it works fine when warmed up that would lead me to believe that it is the choke. It might be hanging up or is not properly adjusted.
Emery Stora
On Aug 12, 2014, at 1:12 PM, Daniel DeLuca wrote:
> Hello,
>
> The coach is still up on blocks, but with most major mechanical work done, I am waiting on the tires before taking it for its first spin. One source of frustration has been the many different ways the car idles when I start it. Recently, the coach has been idling well but when given gas the engine cuts out at about 3,000 rpm and returns to idle. If I keep my foot on the gas it will cut out. There is a little hesitation before it starts to rev.
>
> The problems seems to go away when the engine is fully warmed. Also, I think the engine is running a little rich.
>
> Any ideas? I could adjust the float level, but I would rather not take the carb apart again.
>
> Dan
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| Re: [GMCnet] Stall when revving. [message #258627 is a reply to message #258599] |
Tue, 12 August 2014 18:51 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Yeah, i agree with Emory. I'd suspect the choke. The 'runs fine when warm' is the giveaway.
Also, if your crossovers are not blocked, the heat under the carb will boil the gas out of the bowl when you shut off the engine and you'll have to crank a while to refill the bowl. You'll also usually smell gas.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Stall when revving. [message #258630 is a reply to message #258627] |
Tue, 12 August 2014 19:40 |
Daniel DeLuca
Messages: 120
Registered: June 2014
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Thanks guys,
I’ll troubleshoot that. It certainly looks like its working, but I will try to follow the guide in the manual.
Dan
On Aug 12, 2014, at 7:52 PM, Kerry Pinkerton wrote:
> Yeah, i agree with Emory. I'd suspect the choke. The 'runs fine when warm' is the giveaway.
>
> Also, if your crossovers are not blocked, the heat under the carb will boil the gas out of the bowl when you shut off the engine and you'll have to
> crank a while to refill the bowl. You'll also usually smell gas.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, Manny Brakes, 1 ton, tranny also a 76 Eleganza to be re-bodied as an Art Deco car hauler
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| Re: [GMCnet] Stall when revving. [message #258636 is a reply to message #258599] |
Tue, 12 August 2014 20:30 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Daniel DeLuca wrote on Tue, 12 August 2014 13:12Hello,
The coach is still up on blocks, but with most major mechanical work done, I am waiting on the tires before taking it for its first spin. One source of frustration has been the many different ways the car idles when I start it. Recently, the coach has been idling well but when given gas the engine cuts out at about 3,000 rpm and returns to idle. If I keep my foot on the gas it will cut out. There is a little hesitation before it starts to rev.
The problems seems to go away when the engine is fully warmed. Also, I think the engine is running a little rich.
Any ideas? I could adjust the float level, but I would rather not take the carb apart again.
Dan
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Actually, I think you are running lean. As for the float bowl plugs, it's no big deal and will cause longer crajnking after sitting but really will have no affect on anything else. Many GMC'rs have had this condition for 30 years.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Stall when revving. [message #258637 is a reply to message #258635] |
Tue, 12 August 2014 20:34 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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I agree with Rob. Your fuel bowl is bone dry, due to heat from the intake manifold boiling out the gasoline. Gasoline is a good cooling agent. I have an auxiliary in-line electric fuel pump that I energize for a few seconds before attempting to start the engine. Works like a champ. I also use it to help defeat vapor lock.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Stall when revving. [message #258660 is a reply to message #258650] |
Wed, 13 August 2014 00:14 |
james Ernst
Messages: 79
Registered: December 2013
Location: Lincoln, NE
Karma: -4
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I had a similar problem on my 77 Kingsley. Everytime you wanted to start
it you had to take the air cleaner lid off and hold the choke shut to start
it cold. After it warmed up you could smell it a mile away because it ran
so rich.
The cure: New vac pull off and electric choke. Boom prob solved for me.
Jim Ernst
77 Kingsley
77 PB
Columbus, NE
On Aug 12, 2014 9:32 PM, "Daniel DeLuca" wrote:
> I am not too worried about cranking the engine a little to start it. I
> would like to get the cold running issue ironed out.
>
> Should i set the choke before I start engine every time? Sorry, I can
> turn a wrench but this is my first “classic” vehicle!
>
> Dan
>
> On Aug 12, 2014, at 9:34 PM, Thomas Phipps wrote:
>
>> I agree with Rob. Your fuel bowl is bone dry, due to heat from the
> intake manifold boiling out the gasoline. Gasoline is a good cooling
> agent. I
>> have an auxiliary in-line electric fuel pump that I energize for a few
> seconds before attempting to start the engine. Works like a champ. I also
> use
>> it to help defeat vapor lock.
>> Tom, MS II
>> --
>> 1975 GMC Avion
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Jimbalaya
No Coach yet
60 Olds 88
66 Toro
76 Toro
86 cutlass Supreme
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| Re: [GMCnet] Stall when revving. [message #258856 is a reply to message #258798] |
Thu, 14 August 2014 23:02 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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USAussie wrote on Thu, 14 August 2014 06:49Dan,
I depress the gas pedal to the floor ONCE every time I start Double Trouble.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Daniel DeLuca
I am not too worried about cranking the engine a little to start it. I would like to get the cold running issue ironed out.
Should i set the choke before I start engine every time? Sorry, I can turn a wrench but this is my first "classic" vehicle!
Dan
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If it is stone cold, you definitely need to push the pedal at least once. If warm, I would depress the pedal while cranking and the choke will come on if needed or not if not needed.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Stall when revving. [message #260392 is a reply to message #258798] |
Thu, 28 August 2014 20:08 |
Daniel DeLuca
Messages: 120
Registered: June 2014
Karma: 0
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Senior Member |
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Just an update to this thread. After giving the carb a tune up including all new vacuum lines and an electric choke I still had the problem. I let me head clear a day or two and brought over a friend with some GM carb experience, we figured that the bowl was emptying faster than it was being filled. Starting with what is most simple, I took off the fuel filter, which was filled with solid matter and at least one bug. I did put a new filter on when I rebuilt the carb, but obviously some gunk got into the line. Anyway all better now, and looking into adding an external filter.
Dan
78 Eleganza II
On Aug 14, 2014, at 8:49 AM, Rob Mueller wrote:
> Dan,
>
> I depress the gas pedal to the floor ONCE every time I start Double Trouble.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> USA '75 Avion - Double Trouble TZE365V100426
> AUS '75 Avion - The Blue Streak TZE365V100428
>
>
> -----Original Message-----
> From: Daniel DeLuca
>
> I am not too worried about cranking the engine a little to start it. I would like to get the cold running issue ironed out.
>
> Should i set the choke before I start engine every time? Sorry, I can turn a wrench but this is my first "classic" vehicle!
>
> Dan
>
>
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| Re: [GMCnet] Stall when revving. [message #260393 is a reply to message #260392] |
Thu, 28 August 2014 20:21 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Daniel DeLuca wrote on Thu, 28 August 2014 20:08Just an update to this thread. After giving the carb a tune up including all new vacuum lines and an electric choke I still had the problem. I let me head clear a day or two and brought over a friend with some GM carb experience, we figured that the bowl was emptying faster than it was being filled. Starting with what is most simple, I took off the fuel filter, which was filled with solid matter and at least one bug. I did put a new filter on when I rebuilt the carb, but obviously some gunk got into the line. Anyway all better now, and looking into adding an external filter.
Dan
78 Eleganza II That's our fault (senior members). Everyone should put an inline filter before the location of the mechanical pump, and we should include that early in the noob intro process.
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