Kandice292

About a week ago my 2002 Pontiac Grand Am GT 3.4L 6 cyl started revving a extremely high RPMs during acceleration. Sometimes it will work fine but majority of the time it just jumps to 3K-4K RPMs without accelerating at all. Pretty sure it's only hitting on about 3 cylinders right now. I have to constantly let off the gas, like pump the gas pretty much, til it'll catch all or enough cylinders to accelerate to a reasonable speed. Also VERY horrible gas mileage right now. I took it to Autozone and had a diagnostic test ran but bc they are so general all I found out was it could be the crankshaft sensor, camshaft sensor, or ignition coils. I replaced the spark plugs and wires last weekend but that changed nothing. The car was flooded about 2 months ago so I've had to replace an IAC valve sensor and the intake oxygen sensor already...which makes me lean towards the idea its another sensor issue. Any ideas? Also wondering if its worth the money to just take it to a shop and pay $50-$75 for them to run a better computer test and tell me exactly what is causing the prob. Only thing is, bc of the flood I'm thinking I will end up doing that multiple times cause I probably have lots of sensors to replace so should I just start replacing all sensors? Please advise. Thanks.

maxwedge

A flood deep enough to get into the enginer compt wiil cause many problems over the long term. AZ is no help here, you need a full scan not just for codes but to analyze what is happening. Corroded grounds are another issue as well as corrosion in critical connectors all depends on what happened to the car.

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xeroinfinity

with Max !

Corrosion on any of your connectors could be a big prob.

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1999 Grand Am SS & Grand Am GT 3.4 OHV


Who'd ever thought the "G" in GM would stand for Government Motors.

Kandice292

It was flooded half way up the doors pretty much. I had water in the floor boards. We turned the engine over by hand to drain out all the water but obviously I'm still going to have some issues. Maybe its time to trade my baby in for something else...I have a feeling I'm going to have constant problems from here on out. Thanks for your help.

MT-2500

If it was turned into comp insurance or fixed under comp/insurance you may get them to reopen your case on it.
MT

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Remember proper testing gives us the answer to many problems.
MT

98gpking

if you go out and start replacing all sensors then it could get costly some of those sensors get mighty in cost. like an ABS sensor for instance is not cheap on my 95 NAPA wanted like 68 bucks for it. but anyways ill agreee youll prob just have problem after problem its time to let it go but the fact that you turned it over to insurance its now on te cars record. and if you go trade it in or selll it its gonna show up. i know for sure i wouldnt buy a car involved in flood damage.

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2000 grand prix GTP. CAI, 180 t-stat, u-bend and res delete, custom tuned PCM, shift kit

xeroinfinity

Kandice292,
Couple things here, If the car was flooded in the Ocean water its not worth fixing.

If it was just plain water, you can fix thing much easier.

You might want to start disconnecting the sensors on the motor and make sure they are clean and dry. Some caned air(though expensive) will help blow out any moisture inthese connections.

But from what you explained in your first post, it sounds like your coils could be wet or damaged from being wet.

I think the Zone might be able to check that for you also.
If not, I'll see if I can locate the procedure to check them.

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1999 Grand Am SS & Grand Am GT 3.4 OHV


Who'd ever thought the "G" in GM would stand for Government Motors.