2000 Pontiac Grand Prix

BRIAN85

MEMBER
2000 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
18,000 MILES

Yesterday I went to pass a car and had no acceleration, this had happened once before before so I pulled off the road cut the car off, waited a while and started it up again. The first time this occured it went on just fine except this time I got it up to about 45 mph and it lost acceleration again, I had to do this the rest of the way home about (10 miles). What could be the problem?

5 Replies

JAMES W.

MECHANIC
2,395 POSTS

First thought is fuel filter. Any check engine light? On your way back home was it popping and spitting or you just stepped on the gas and nothing would happen. Have you driven the car since and if "yes", how did it run after it sat for a while? Please advise.

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Sunday, November 23rd, 2008 AT 8:01 PM

BRIAN85

MEMBER
3 POSTS

Yes the check enging light is on, and there was no popping or spitting in just stepped on it and nothing happened. I tried to drive it today and I got it up to about 45mph and the same thing happened it lost acceleration. So I pulled over, turned the car off and cranked it again and the same thing happened, I even stepped on the gas and it just slowly decelerated. I have had codes read on it once before I got something about the I wanna say something about the catalytiic converter on the transmission and thermostat.

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Sunday, November 23rd, 2008 AT 11:02 PM

JAMES W.

MECHANIC
2,395 POSTS

Going by the information you have posted, I have to say your catalytic convertor is plugged. This will cause the symptoms you described. Hope this helps.

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Monday, November 24th, 2008 AT 10:16 AM

BRIAN85

MEMBER
3 POSTS

Is that dealing with the T.C.C. Because the last time I had it checked that was mentioned in one of the codes.

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Saturday, November 29th, 2008 AT 9:05 AM

JAMES W.

MECHANIC
2,395 POSTS

The TCC is part of your transmission. From your description, that is not the problem. The catalitic convertor, on the other hand, is part of the exhaust emissions system. If this unit is plugged, the exhaust can't get out of the engine and it will stall from the back pressure.