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2002 Grand Am 3.4 idle drops and then car stalls

Customer Question
2002 Grand Am 3.4 idle drops and then car stalls
Submitted: 2 years ago.Category: Pontiac
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Answered in 5 minutes by:
12/16/2015
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago
Amedee
Amedee, Pontiac Technician
Category: Pontiac
Satisfied Customers: 27,096
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome! My name is ***** ***** I can assist you with your question. Have you checked the fuel pressure regulator?

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Check to see if the fuel pressure regulator is leaking. If so, the diaphram has ruptured and will need to be replaced.

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Another possible cause would be an air or a vacuum leak or possibly a bad MAP/MAF sensor as they both can cause a stalling condition.

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Customer reply replied 2 years ago
It is good. Dry and holds vacuum
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Excellent!!

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Customer reply replied 2 years ago
No vacuum leaks. How can I test the MAF or MAP sensor?
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

You can use a voltmeter or a scanner

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Customer reply replied 2 years ago
What are the specs
Customer reply replied 2 years ago
We have a snap on modus scanner
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Perfect!

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Watch the readings at idle and see if they drop down before the engine stalls. If so, the sensor is bad.

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Customer reply replied 2 years ago
Waiting for it to stall. Right now the MAF sensor is between 4.23 and 4.42 Volts. MAP Sensor is between 1.45 and 1.61. I will let you know when it stalls. Should we check fuel pressure?
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

I would..

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Customer reply replied 2 years ago
Mechanic just told me that as the car gets warm it is stalling less
Customer reply replied 2 years ago
Could a code P0480 cooling fan circuit caused this stalling?
Customer reply replied 2 years ago
Fuel pressure is within spec. Car has not stalled for the last 10 minutes
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

ok good

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Customer reply replied 2 years ago
Here's what we found. Car was getting hot. Were able to control fans from scanner no problem. not coming on from temp. Unpluged ect and fans came on. Is there a way to test the ect?
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

You can ohm it out or just look at the temp reading on the scanner and make sure it matches the engine temp

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Customer reply replied 2 years ago
ok the car is throwing a p0118 and p115 code. as soon as I put a load on the engine it wants to stall when hot
Customer reply replied 2 years ago
the second code is p1115
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Thats probably because you had the ECT disconnected

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Customer reply replied 2 years ago
Ok we have the car stalling. The Map sensor goes from 1.4 to almost 5 volts when the car stalls. Is this normal? Also when the car stalls it sounds like it is sucking air
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

It sounds to me like you have an air or a vacuum leak.

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Customer reply replied 2 years ago
we have a vacuum gauge on the engine now and it has about 18-19in hg at idle
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

I am going to leave this question open.

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Customer reply replied 2 years ago
thanks for your help. hopefully someone with more knowledge will take over.
Pontiac Mechanic: Tool Hut, ASE Certified Technician replied 2 years ago
Tool Hut
Tool Hut, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 551
Experience: Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles
Verified

Hi, My Name is ***** ***** for posting your question to just answer. I am a ASE Certified Master Auto Technician with 20 years experience. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.I also try to give all of the information you may need expecting a positive rating.

Do you have the air cleaner ducting installed? Have you attempted unplugging the MAF and see if it still stalls?

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Customer reply replied 2 years ago
Actually I believe we have solved the problem. We replaced the ignition control module and it has yet to stall. Thank you
Pontiac Mechanic: Tool Hut, ASE Certified Technician replied 2 years ago

OK. Let me know if you need further assistance

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Pontiac Mechanic: Tool Hut, ASE Certified Technician replied 2 years ago

It has been a couple of days since I have heard from you. Do you still need assistance? I have also noticed that I have not received a rating from you. If for some reason you question did not get answered please reply. I am only compensated for my time when you leave a positive rating. Your understanding is appreciated.

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Tool Hut
Tool Hut
Tool Hut, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 551
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Experience: Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles

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