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Kaitlyn Gawley

Kaitly ... 1/13/2018

2004 Pontiac Sunfire SE 4 Cyl 2.20L

Engine

Stalling issues on a 2004 Pontiac Sunfire

I have had random stalling while driving over the past 4 weeks, have had the car in and out of the shop, replaced air box, idle air control valve and ignition switch, we have cleaned the throttle body and tested fuel lines as well as putting dry gas in the tank. The car usually, but not always, stalls after running for at least 20 minutes and is always at low rmps. I can travel fine on the highway at 60 mph and then as soon as I come to the off ramp and stop at the light it will stall, or at stop lights and stop signs. Recently the issue has gotten worse and once it starts stalling will stall over and over until you cannot get it to turn over and stay on. The car will start the rpm will go up to about 1000 and then drop off instantly. Any help would be greatly appreciated.

3 Answers


wayne snyder

wayne snyder 1/13/2018

I had similar problem with my honda civic. I thought it may be fuel pump but had to replace the ecm (computer) to fix the problem. I think you may have the same problem. Do you hear the fuel pump running when you car stops running?

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wayne snyder

Kaitlyn Gawley 1/14/2018

Not that I've noticed. It usually will stall once, I can then throw it into neutral and it will stall again. At this point it stalls quicker and quicker each time. If I let it sit for bit I can restart it and let it idle but it will usually stall again.

I then have it towed to the mechanic and when he looks at it the following day he can't get it to stall. I take it back and it works fine and then will randomly stall.

It has been pretty cold out each time it happens & is worse w/ headlights

HouseCallAuto

HouseCallAuto 1/14/2018

Most driveability concerns must be diagnosed by first reading fault codes stored in the vehicle's computer memory. You have made no mention of anyone talking about codes, not that you are supposed to know about such things but many people are aware of the diagnostic process while trying to get a tough problem solved. That being said, what codes have been seen and has the check engine light been illuminated at all during these drives? Buy at code reader at Amazon for under $20 and read the codes yourself in a minute. The top causes for the stalling you are describing are the idle speed control circuit which can also include broken or poor connections in the wiring for this component as well as other very different causes. It will require the person trying to diagnose this to know if there are codes, and if there are codes he has to know what the code numbers are. If there are no codes ever, that in itself helps knowing this.

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HouseCallAuto

Kaitlyn Gawley 1/14/2018

The mechanic that has been working on the car is GM trained and has been working on these cars for thirty years; however he can't find what is causing this problem.

He said that the computer doesn't show anything. And the check engine light never comes on.

Thanks

HouseCallAuto

HouseCallAuto 1/14/2018

OK, I understand. he has one of the tougher ones to solve. Glad you have a good guy lookin at it and not just anyone. We all get difficult ones to deal with. When there are driveability issues and the computer gives up no info is the worst possible diagnostic to do. Many people just start throwing parts at it.
Tell him this - Adjust (if necessary) the base idle speed to achieve 10-15 counts on the IAC motor (base on the scanner), when at a hot idle, in park and all accessories off including the cooling fan and see if it helps, and also tell him that if he used any other brand of idle speed control but ACDELCO to replace it again with ACDELCO only. I had one GM car (a Cadillac Deville) beat me up because of a low quality ISC motor. The ACDELCO part solved my issue soon as I changed it out. I wish him luck, I understand. The best mechanics are the ones that can solve issues like this with minimal parts replacement.

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HouseCallAuto

Kaitlyn Gawley 1/14/2018

Okay, so we have changed the IAC out, but it wasn't ACDELCO. However today we had a look at it. Changed the ignition control module and car still wouldn't start. We tested for fuel pressure and there wasn't anything this time so now we are going to be replacing the fuel pump.

You're right though we've basically been throwing parts at the vehicle like crazy.

HouseCallAuto

Teddy B 1/14/2018

Why does a 30 year Veteran Mechanic throw parts at a vehicle ?
I was going to suggest a Fuel Pump day's ago when you posted
the question, but apparently your guy does his testing differently
than I do, or never road tests with test equipment along for the ride.

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