Crappy runing problem

MYOLDS

MEMBER
1993 OLDSMOBILE CUTLASS
99,000 MILES

Have very little power at take off. Bucks and jumps and backfires in engine compartment sumwhere. Once on open road runs fine. Have changed plugs, wires, done induction cleaning, ran 44K through system. Changed mass airflow sensor, also have a strong gas smell when backfires. Stalls at traffic lights. HELP !

5 Replies

SATURNTECH9

MECHANIC
30,870 POSTS

Do you have any codes?

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Wednesday, January 4th, 2012 AT 4:34 AM

MYOLDS

MEMBER
3 POSTS

No codes

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Wednesday, January 4th, 2012 AT 5:18 AM

SATURNTECH9

MECHANIC
30,870 POSTS

Have you performed a compression test?

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Wednesday, January 4th, 2012 AT 5:22 AM

MYOLDS

MEMBER
3 POSTS

Compression was fine. Fuel pump pressure good to. She runs great once I get to highway speed. Have had it to 90 mph and runs great. Just the stand still thing. Hot or cold it does it. Been told could be converter but no smell of rotten eggs, just gas smell like it is dumping to much gas

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Wednesday, January 4th, 2012 AT 5:36 AM

SATURNTECH9

MECHANIC
30,870 POSTS

I have replaced tons of cats plugged and just not working correctly and very few of them smelled like rotten eggs. Why dont you have a back pressure test done on the exhaust to rule out a plugged cat.