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Sedans Pontiac Grand Prix Pontiac Grand Prix Starting / Stalling Issues
208 messages, Last post on Nov 02, 2009 at 2:18 PM
You are in the Pontiac Grand Prix Forum. Your Hosts are pat & karens
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Replying to: jessewoo15 (Sep 22, 2009 1:16 pm) |
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Replying to: jessewoo15 (Sep 22, 2009 1:16 pm) My 1999 Grand Prix has been acting up with all the same symptoms many people described. Engine cut out at highway or low speed; hard to start after a hot shut down; the Trac light stayed on after the engine cut out and immediate restart in neutral etc. It was getting worse lately with the hot weather. I contemplated replacing the crank position sensor, mass air flow sensor, PCM one at a time, and hundreds of $ at a time, like many people before me. Then, I found the way to fix my problem at ZERO DOLLAR! I figured that it could be a voltage problem. I used a multi-meter. I measured the voltage across my battery, which show the normal 12.7 V. But from the positive terminal junction to a good ground on the engine (e.g. Al engine mount) the voltage has dropped down. I also measure the conductivity as well, and I did not get zero Ohm between the negative terminal to the good ground spot on the engine. I removed the grounding cable attached to the body panel and found that it was bolted on to a part with original body paint! What a bad design! Paint is not the best conductor in the world! After years of dirt and rust build-up, the conduction between the bolt threads won't be as good as before. So you get intermittent voltage drops that stalled the engine. I gave the contact a good rubbing with sand paper. I check voltage and conductivity after and it was good as you would expect. Since than, I never had a single staling. It has been three weeks with lots of kilometers in hot weather. I trust that the same remedy will solve a lot of your problems. I apologize to many garages for reducing tens of thousands of dollars of their potential business.
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Replying to: pat_from_grove (Sep 27, 2009 7:36 am) I have a 2005 GP base model - I had similar issues. My engine did not die at hwy speeds BUT the computer would crash leaving me to fly a dead elephant down the hwy with no gas or instruments. There is a secret GM TSB I pasted it a while back for Chev, Pontiac and Buick cars running on the Impala platform. The first recommendation is to check the ground strap and the second procedure is to flash the PCM's with a firmware update (not your naked body - although you can try this for kicks). I did what you did and cleaned off the strap and have had no issues apart from a rough start after a hard drive which is likely an oxy sensor on its way out or a filter. Good on yah dude - that's a good fix. Sorry you had to spend so much money - but it sure feels good when you stop! |
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Hello everyone. First off, thanks for taking the time to read my post. I have recently bought a 1998 Pontiac Grand Prix SE 3.1 for $600. When I purchased it, it had the Low Coolant light on, and check engine light on. I knew right off the go what the coolant light was. Damage to the intake manifold gasket due to the DexCool that was in the cooling system. I had that replaced. The Low Coolant light is still blinking, I'm thinking it is a bad sensor because I had also just replaced the radiator cap and upper hose, no further leaks are found in a pressure test. Oil was changed when intake was replaced as to get out all the coolant/water from the engine oil. This is not my main problem. The main problem is the car has a somewhat of a rough idle. More now than before.When you start the car (It starts fine by the way) the RPMs fluctuate from 500 RPM - 1000 RPM. It doesn't die out, but sounds sluggish. It is fine while moving, and when it slows back down to idle, it fluctuates only minorly. The Check Engine light I am getting is for a Camshaft Positioning Sensor. I know where it is, and how to change it. But, would this be the reason of why it is acting so strangely?
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Replying to: esone (Oct 06, 2009 9:20 pm) |
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Hey all, I had my 2002 grand prix at a local mechanic with stalling issues. Sometimes it would start, and stalls near idle, but has also stalled while driving. He initially fixed some vacuum seal and that didn't do the trick. He replaced the crankshaft position sensor and that didn't work either. I took it to a dealership where they put in a new PCM and ignition control module, not a damn thing. The service engine light just came on (after all of this work) and it's reading P0300, multiple random misfires, and i have no idea what the problem is. It will start and run beautifully sometimes, other times it takes multiple attempts to stay running (will turn over, quickly die), and often it will run very rough and will "rev" for no reason. Anyone!?
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Replying to: jessewoo15 (Oct 12, 2009 3:13 pm)
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| I have a '99 Grand Prix GTP with about 65K on it. Car never had any problems until recently, and I'll explain: I purchased gas at a diff gas station than I normally do (I try to stay with one particular "brand"), got the premium as always, no issues. After getting home and trying to start the car back up again it kept sputtering when I accelerated, and died out when at a complete stop. The car will start back up again, no problem. If I get the car to maintain a certain speed (highway driving, for example) I have no issue with stalling or sputtering when accelerating. It seems to happen if I am: A) at a complete stop - it will sputter, jerk forward, then sometimes die out (not always though). B )if I am starting to accelerate after a stop/starting up the car will start to sputter. If I let it run idle the car will sputter, and the lights will dim as well with each sputter, as well as the RPM gauge moving up with each sputter. I have already changed my fuel filter, and I had added some Lucas fuel additive in case it was bad gas. Is that a possibility? I still have not run all of this gas out of my tank (I got a full tank) I also had taken the car to both Autozone and Advanced Auto Parts for the free diagnostic check and neither place showed my car as to having any codes to figure out what the problem could be. (also there is no Check Engine Light on). I don't have a lot of money (paycheck to paycheck living here lol), and since no codes/engine light are coming up then what could the issue be? Any help would be appreciated, thank you so much!! | |
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Replying to: severedstar (Oct 13, 2009 12:23 pm)
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Replying to: severedstar (Oct 13, 2009 12:23 pm) However, I'll also say: The guys at the garage NEVER had a problem with the car. For them, it always ran great. For me, it often refused to start or just died in the middle of traffic. The car runs fine now, but I feel some loss in power -- as if the V6 has gone down to a fully functioning 4-cylinder.
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