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Rough idle bogs and backfires
1991 Pontiac Firebird

Rough idle bogs and backfires

(1991 Pontiac Firebird)
i am clueless on the prob rough idle.idles at about 700rpm.boggs down when accelerating. bickfires when u giver gas. and a very rich gas odor please any ideas hopfully u know a lil more than i do?????
1 answer & 2 comments
Popular Answer
on March 24, 2011
Sounds like for one thing you could have an exhaust restriction - like a restricted catalytic converter.

Sounds also like you could have a serious vacuum leak at the engine and/or an air intake leak.

A diagnosis by a qualified technician is required to really pin point the source of your problem; but I wouldn't wait because further damage from raw fuel consumption could be occurring.
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i changed all plugs plug wires checked the codes nothin came up wouldnt a vac leak trip a code????
on March 24, 2011
Plugs and wires will not cause the bogging down on acceleration.

A vacuum leak will not necessarily trip a check engine light on this year of a car. The engine processors were not as sophisticated as they are today.
General Diagnosis
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on March 24, 2011
Sounds like for one thing you could have an exhaust restriction - like a restricted catalytic converter.

Sounds also like you could have a serious vacuum leak at the engine and/or an air intake leak.

A diagnosis by a qualified technician is required to really pin point the source of your problem; but I wouldn't wait because further damage from raw fuel consumption could be occurring.
Sign in to reply
i changed all plugs plug wires checked the codes nothin came up wouldnt a vac leak trip a code????
on March 24, 2011
Plugs and wires will not cause the bogging down on acceleration.

A vacuum leak will not necessarily trip a check engine light on this year of a car. The engine processors were not as sophisticated as they are today.

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