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How do you find vacuum leak on a 91 pontiac grand am?

My car is kinda rough at idle...and stumbles bad when I give it gas while driving?

  • Its a 1994 Pontiac Trans Am 25th-v8 special. I accidently put bad gas in it and ran on it for a couple miles. Realizing what i did I flushed my tank. (nothing nasty was in it). I have replaced the fuel pump, fuel filter, fuel injectors, distributor, spark plug wires, spark plugs, air filter. No kinked gas lines, cant find a vacuum leak. No antifreeze is missing or in my oil. What can it be??

  • Answer:

    I don't have an answer but I have the same exact problem with my car, same year, V8. Stumbles really bad when I give it gas and runs better when I let up a little, still accelerating, if that makes any sense. It also idles really rough, high, then low. Makes me look like an idiot at the stop light. I just bought the car and would really like to figure this out. I've replaced plugs, wires, fuel filter, cleaned the injectors, checked all lines, etc...... I've had a few mechanics look at it and one seems to think it's some contacts or something in the distributor, but I'm kind of tired of tearing the damn thing apart trying to figure this out. Would love to find the person who can tell me exactly what it is and I'm sure the person with the same question would too, haha. I have a feeling I'm replacing everything and it's something much simpler than that. Thanks for any and all the info!!

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Clean The EGR

THE DAWG.

how could you have changed all of this stuff and not realized it is a pile -o-crap?

heavyhauldad

Well I know from my friend who knows his car very well. It may be that as old as your car is, the crankshaft might be bent, damaged, etc. Or, even worse is that if your car runs under 1000 rpm (1 at tachometer) the slower idling is slow enough for you to feel it. This isn't a problem, just get the idle adjusted if possible. This vibration can shake parts and loosen screws, anything like that. However, there is an even more worse possibility. The engine piston(s) might be bent, causing the piston to strike the casing inside each cylinder. However unlikely this is, it may be quite possible especially because it is not visible, and because of the car's age. I highly recommend that an authorized shop do an analyzation of your car. If he can't find anything, then it might be inside the engine or other parts that he or she cannot access. If the predicament is that the piston, transmission, crankshaft, etc, then you might want to buy a new car, as overhauling or repairing this kind of situation will cost several hundred, if not thousands. Just my honest opinion.

asianmaster939

It's an old car, maybe the timing is off. Another thing you can try is when starting have the starter motor on a teeny-bit longer. Sometimes, having that moment too short can cause "power issues" or timing issues. With all those things you changed, it really shouldn't be related with fuel anymore. Have you had a shop look at it at all? How are the drive belts? Try a machine flush

Brian L

try and check the coil pack

toyfinder

drive it for awhile and see if it clears up and if it doesn't maybe the oxygen sensor got messed up.

mister ss

if your car ran good before u put bad fuel in it...I would recommend you check that you got the plug wires on right ...getting two of them wrong could cause your problem..i would also buy new plugs and replace them again as they are not firing right they will be bad

wwwstat

By bad gas what do you mean? Dirty? Wrong Kind? Their is another thing that comes to mind, can you trust the person/garage who claimed to have done all that. It seems to me that doing all that work before diagnosing the problem is someone trying to rip you off. Otherwise try a compression test.

Curious George

Have you checked you O2 sensor(s)?

brokemxer

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