04 grand prix stalls above 1800rpm

**pclute** · 03-26-2013

Hello. Im new to this forum and I'm hopping I can get some advice. Last week my car stalled on me when I was backing out of the driveway. It seems to stall when ever the RPM's get above 1800. I will idle all day until the gas runs out. I Changed the fuel filter since I have 256,000 miles on the car. I've cleaned the MAF sensor. still didn't work so I took it to a shop after they said that it was the fuel pump. So I changed that out and still does the same thing. There is no miss, studdering of any kind. It just stall when you push on the gas.

**BillBoost37** · 03-26-2013

Hmmm

Not the average problem here.

Supercharged or not?
Any work done recently before the issue occurred?
Have you checked for a vacuum leak say at the hose to the brake booster? That elbow into the booster is a check valve and they can go bad.

**pclute** · 03-26-2013

non-supercharged. No recent work done. No I haven't checked for vacuum leaks. I was told that the catalytic converter might be plugged up.

**BillBoost37** · 03-26-2013

It could be.. easy way to test is to remove the front O2 sensor. Wear hearing protection and don't beat it, but try and see if it stalls.

**pclute** · 03-26-2013

if you very slowly accealerate you can drive it anywhere but as soon as you give it to much gas it stalls.

**justinhvr1** · 03-26-2013

I had this same problem on my old car it turned out to be the cam shaft position/precision sensor

**pclute** · 03-26-2013

@justinhvr1. thanks haven't thought of that. I'll have to test it.

**rperry435** · 03-26-2013

I have seen this problem before

One was a clogged cat.

The other was a broken purple/white wire on the Crankshaft Position harness.

A third possibility would be a bad crank sensor

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**Sudden** · 03-27-2013

I got the stability error everytime I stepped on it at all hard. Replaced both front hubs, PCM. it turned out to be a vac line that fell off.

**pclute** · 03-29-2013

sorry working alot. But pulled O2 sensor before cat. car still stalls. All Vac. lines seem ok. What about the Throttle Position Sensor? auto Zone says I have to buy the whole throttle body.

**UCF04GPGTPCompG** · 04-18-2013

I get a similar stalling issue above 3000rpms when trying to accelerate. I'll check th vacuum line from the brake booster, but where are the other vacuum lines? I figured I should check them all out to be sure they are fine but I'm not sure where to look. Thanks for the help.

**UCF04GPGTPCompG** · 04-19-2013

I found most of the vacuum lines, replaced two of them and did seafoam (in gas & vacuum line). Still have the same issue but atleast I know the vaccum lines are better and the engine is a bit cleaner. Couldn't find any leaks in any exhaust parts when the smoke from seafoaming the vacuum line was coming out the back.

**dsmuts** · 04-19-2013

Did you pull the tb and clean it up?

**UCF04GPGTPCompG** · 04-19-2013

I didn't unbolt it but I cleaned the outside and as far back as I could reach by hand with a rag and TB cleaner about a week ago. Also, cleaned MAF Sensor & Air Filter on the CAI

**dsmuts** · 04-19-2013

Pull it off and make it spotless

**UCF04GPGTPCompG** · 04-19-2013

If I do, do I need to use anti-seize or anything else on the bolts or the mating surface?

**dsmuts** · 04-20-2013

No Don't have to replace the gasket either

**UCF04GPGTPCompG** · 05-07-2013

Anything specific to clean the gasket with before putting it back on or just rub off any dirt/debris on it? I'm going to have a new one with me just incase the gasket falls apart. Gonna do the TB once my gift card from Advance Auto comes in.

**dsmuts** · 05-07-2013

Just wipe the gasket off and reinstall.

**UCF04GPGTPCompG** · 06-28-2013

Since my last post I took off TB, cleaned it, replaced the TB Gasket, cleaned the MAF Sensor. These didn't fix the misfire problem. I finally had a chance today to replace both spark plug wires I had gotten for free from MSD. They were the cylinder 4 & 6 wires, replaced them, took off all other wires and used dieletric grease on the coil & spark plug end of the wires. This fixed the misfiring issue. I'm very excited.