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Topic: Pop, Stutter, Stall (Read 280 times) previous topic - next topic
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Pop, Stutter, Stall
1989 Chevy G30, 5.7l, 8 Cyl.
It idles just fine
When I try to drive, after about 1/3 miles, it begins to pop, stutter and then stalls.
When I immediately try to retart, it won't.
If I leave it for about an hour, it' starts and drives a short distance and then the popping etc. cycle begins again.
The fuel filter has about 1 1/2 miles on it and is known installed correctly.
I have checked and cleaned electrical connectrs and checked vacuum hoses for leaks.
I have spent the last week researching thoroughly (including this site) what the causes might be and therefore understand there are myriad possible reasons. e.g., Fuel Filter/pump. EGR Valsve, O2 Sensor, MAF,  Injectors and more.
I am adopting the process of elimination regarding the fuel system. First of which was the fuel filter. Fuel pump next?
Any tips on how to move forward would be most welcome.
OBD1 shows no error codes. (Unless I am using it incorrectly).

LD 22', 1989 Custom Build. Chassis 1990 Chevy Van G30, 5.7l.
Re: Pop, Stutter, Stall
Reply #2 –
It does sound like a fuel problem. A failing fuel pump or a plugged filter sock on the fuel pump are possible causes.
I would start by testing the fuel pressure and fuel volume flow. It does require the proper tools.
https://www.harborfreight.com/basic-fuel-injection-service-kit-64939.html

Larry




Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
 
Re: Pop, Stutter, Stall
Reply #3 –
Quote from: Larry W  - 
It does sound like a fuel problem. A failing fuel pump or a plugged filter sock on the fuel pump are possible causes.
I would start by testing the fuel pressure and fuel volume flow. It does require the proper tools.
https://www.harborfreight.com/basic-fuel-injection-service-kit-64939.html

Larry

As usual, thanks Larry! Given the vehicles' age, and that I can do the work, I may just get a new fuel pump assembly. What is confusing me, is that it idles great and does not cut out when I raise the revs. (While doing that, I checked the fuel being injected, and it has a circular outside spray with more of a drippig in the center). However, the moment I try to drive, it stutters and cuts out. Could that mean something electrical?






LD 22', 1989 Custom Build. Chassis 1990 Chevy Van G30, 5.7l.
Re: Pop, Stutter, Stall
Reply #4 –
Are you throttle body fuel injection? The in tank pump usually just quits. How about the distributer Have you looked at the cap, rotor and coil? The coil is built into the cap. I think I'd bet on a fuel pump or coil. Coils usually work cold and quit as they get hot. I just reread your post and saw that you are throttle body injection. I had a pickup that had one injector quit it would run but wouldn't pull itself. I also lost the pump one time and it just quit. yours could be failing.

Jon
1994 MB
Re: Pop, Stutter, Stall
Reply #5 –
Quote from: Mindispower  - 
I may just get a new fuel pump assembly. What is confusing me, is that it idles great and does not cut out when I raise the revs. (While doing that, I checked the fuel being injected, and it has a circular outside spray with more of a drippig in the center). However, the moment I try to drive, it stutters and cuts out.

A weak pump may provide just enough fuel to idle or rev in neutral. When asked to do real work, the fuel supply may be inadequate and would cause stumbling.
The throttle body may be dirty or partially plugged, I never owned a vehicle with TBI so little experience with it.
There may be an obstruction in one of the fuel lines that limits fuel flow.
Testing for fuel pressure and volume continues to be where I would start looking before changing any parts. It appears your LD's fuel pump is in the tank, it could be difficult to change.

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
Re: Pop, Stutter, Stall
Reply #6 –
Quote from: Larry W  - 
A weak pump may provide just enough fuel to idle or rev in neutral. When asked to do real work, the fuel supply may be inadequate and would cause stumbling.
The throttle body may be dirty or partially plugged, I never owned a vehicle with TBI so little experience with it.
There may be an obstruction in one of the fuel lines that limits fuel flow.
Testing for fuel pressure and volume continues to be where I would start looking before changing any parts. It appears your LD's fuel pump is in the tank, it could be difficult to change.

Larry
It is a difficult change, but I have done this before. I have to watch my pennies.
LD 22', 1989 Custom Build. Chassis 1990 Chevy Van G30, 5.7l.
Re: Pop, Stutter, Stall
Reply #7 –
Thanks all! It was the fuel pump. I put in a complete module and she purrs like a cat. (Actually, better than a cat).
LD 22', 1989 Custom Build. Chassis 1990 Chevy Van G30, 5.7l.
Re: Pop, Stutter, Stall
Reply #8 –
Quote from: Mindispower  - 
Thanks all! It was the fuel pump. I put in a complete module and she purrs like a cat. (Actually, better than a cat).


Thank you for the update.

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Sam