2000 Grand Prix GT stalling at stop

2000GPGTBlue2dr · 07-11-2006, 08:27 AM

My Grand prix (3800 engine) is occasionally stalling at stop signs. Is this a fuel sending/ injection problem??? I watch the rpm gauge, and when I hit the brakes the gauge drops below 1000 rpms and sometimes it corrects itself and but sometimes it just drops to zero and the car turns off. I have no codes on the car whatsoever (checked it out with a handheld code reader I bought from Advance Auto). Has anyone else had this problem. Any help would be appreciated. Thanks!!!!!

BNaylor · 07-11-2006, 09:15 AM

You have one of three possible problems.

If stalling is only at low rpms or around idle possible defective idle air controller or just dirty. Try cleaning the IAC with carb or throttle body cleaner. Also, clean the seat where it mounts to the throttle body.

Second, it coud be an ignition related problem. So far maybe symptoms of a flaky crank position sensor (CKPS).

Third possibiity is a fuel delivery problem (not fuel injector). Check the fuel pressure at the Schader valve located at front fuel injector rail to see if in specs. Also, replacing the fuel filter won't hurt.

2000GPGTBlue2dr · 07-12-2006, 08:57 PM

Well I cleaned the idle air controller- and man it was dirty (lots of black carbon deposits on it). The car no longer stalls at stops. It just turns off while it's sitting and idling. I think it's the fuel filter. I will change that out to see if that fixes the problem. Where is the crank position sensor (CKPS) located on my engine- is it easy to replace?? I read some other threads and people said a possible symptom for my problem is the vacuum lines on the intake manifold may be loose. I'm not sure how many there are and where they are all located to make sure they are on tight or not????

BNaylor · 07-12-2006, 09:08 PM

Quote:

Originally Posted by 2000GPGTBlue2dr

Well I cleaned the idle air controller- and man it was dirty (lots of black carbon deposits on it). The car no longer stalls at stops. It just turns off while it's sitting and idling. I think it's the fuel filter. I will change that out to see if that fixes the problem. Where is the crank position sensor (CKPS) located on my engine- is it easy to replace?? I read some other threads and people said a possible symptom for my problem is the vacuum lines on the intake mainfold may be loose. I'm not sure how many there are and where they are all located to make sure they are on tight or not????

Try the fuel filter first. Here is a procedure for location and changeout for the crank position sensor:

http://mykidz.net/GTP/CrankPosSensor.shtml

The main vacuum lines are located on the Throttle Body (TB) and Upper Intake Manifold (UIM). From the TB one goes to the fuel pressure regulator and the other to the purge valve. There is an accessory vacuum line that goes to the HVAC system. Vacuum related to the PCV valve is internal to the UIM so that will not be visible.

Grim4208 · 07-14-2006, 01:58 PM

Man, I was having the same problems with my 2000 GT, I checked it out and it turned out to be the Mass Air Flow Sensor... I got it replaced for about 367 part and labor and it runs like a charm now.

amesjm0431 · 07-14-2006, 04:18 PM

I agree with Grim. I was having the same issue with my 2001 GTP and I changed the MAF and it worked great. It is pretty easy to do it yourself.

2000GPGTBlue2dr · 07-17-2006, 08:17 AM

Yep. You guys are correct. It was the Mass Air Flow Sensor that was causing it to stall at idle and also when I would accelerate (because slowly but surely it was getting worse- before it would only stall at stops). I also replaced the fuel filter for good measure since it's original and I have 88000 miles. Now my car is back to normal. Thanks to everyone for their help.

iT90accord · 07-24-2006, 01:27 PM

Where exactly is the Mass Air Flow Sensor located? Mines bad and needs replacing and it was at a mechanics and they said its under the engine cover by the manifold and that looks like the throttle body to me. Is the MAF in all the black casing for the air intake?

BNaylor · 07-24-2006, 01:34 PM

It is the black module right on top of the throttle body. Two Torx safety screws hold it on. Here is one removed.

BTW - What year, model and engine Grand Prix? Make sure you get the right one for your year and engine.

iT90accord · 07-24-2006, 01:54 PM

Theres something else to it besides that sensor though. I think there is a part in the actual casing of the intake that is quite a bit bigger. I dont see how just that black sensor is $220.

Its a 2000 Grand Prix GT 3.8L

BNaylor · 07-24-2006, 02:14 PM

Quote:

Originally Posted by iT90accord

Theres something else to it besides that sensor though. I think there is a part in the actual casing of the intake that is quite a bit bigger. I dont see how just that black sensor is $220.

Its a 2000 Grand Prix GT 3.8L

No there is not. The MAF sensor new from GM is expensive. $221.13 is the GM List price.

You could get a remanufactured one from one of those national auto parts stores for 1/2 the price but those have a high failure rate especilly is it is an A1 Cardone part.

Checkout ZZPerformance.com. They have the GM MAFs for around $119 plus shipping.

http://www.zzperformance.com/grand_p...ee46203e7acd96

iT90accord · 07-25-2006, 09:13 AM

Are those good quality ones at ZZperformance?

BNaylor · 07-25-2006, 09:28 AM

Quote:

Originally Posted by iT90accord

Are those good quality ones at ZZperformance?

It is the GM OEM MAF sensor brand new not reman. I have never had a problem with any part I got from ZZP.

iT90accord · 07-25-2006, 10:02 AM

Quote:

Originally Posted by bnaylor

It is the GM OEM MAF sensor brand new not reman. I have never had a problem with any part I got from ZZP.

Thanx a bunch man I really appreciate the help

kstorlien · 04-05-2011, 10:16 PM

Don't buy the MAF not made by GM. The cheap one lasted me 2 years and now I have to replace it again. I will be buying the GM part this time for sure.

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