1999 Pontiac Grand Am Pudderring at braking

ROBUTMOBUT

MEMBER
1999 PONTIAC GRAND AM
4 CYL
FWD
AUTOMATIC
205,000 MILES

I have a 1999 Pontiac Grand Am that recently went to the mechanic I had my catalytic converter changed and my Ignition coil housing and plugs changed but my car is still hesitating when I stop. I was told my car has to build back the pressure it lost from the gas getting into the spark plugs it's been a week and I haven't seen any difference any suggestions?

3 Replies

MASTERTECHTIM

MECHANIC
4,749 POSTS

I have never heard that one before. Sounds like a different problem or same problem you had but not fully fixed yet. Its got nothing to do with back pressure, I would like to know what fuel pressure is and what the mass air flow sensor is reading and youwill need a scan tool and fuel pressure gauge for that. My suggestion is to bring it back to the repair shop and let them try to rediagnose it. Hopefully they will not charge you for the diagnosis and if you think it might be a problem let them know your looking for them to get to the root of your original problem which you already paid to have fixed. Im not saying the coil cover or cat were not needed to be repaired but it sounds like something else is going on too.

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Wednesday, November 12th, 2008 AT 8:23 PM

ROBUTMOBUT

MEMBER
2 POSTS

I maybe didn't explain this too well initially, my car is hesittating upon braking like it wants to kill I was told gas was getting into my spark plug and may have washed out the cylinder 4 because it was not firing the coil housing was changed and the reading went from 0 to 75 and I was told that I would need to drive the car and let the oil surface back to the top but I am still smelling gas fume from my Ac vent it's been 2 weeks and I see no change any suggestions?

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Saturday, November 15th, 2008 AT 3:27 PM

MASTERTECHTIM

MECHANIC
4,749 POSTS

If the cylinder was gas fouled then I hope they changed the oil and it should have cleared up in a couple hours. Sounds like you may need a new look at this because im leary of the advice your mechanic is giving you. If you smell gas its coming from somewhere and it should not be hard for him to find

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Saturday, November 15th, 2008 AT 7:23 PM