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Jeep is rough. it jerk during driving. black smoke is coming out the exhaust.
1999 Jeep Wrangler

Jeep is rough. It jerk during driving. Black smoke is coming out the exhaust.

(1999 Jeep Wrangler)
During idle it shakes the car roughly. Every time I drive normally during 1-4 gear it slows downs then out of nowhere it picks up speed after the fact I press the gas pedal a few second before. So it jerks and black smoke is coming out
What seems to make the problem better or worse? It's worse when engine is warm
How long have you had this problem? Since Monday
Tags: jeep, wrangler
1 answer & 0 comments
Popular Answer
on September 20, 2017
Hello,

Black exhaust typically indicates that your vehicle is using excess fuel.

The vehicle needs to have some testing in regarding engine performance.

Testing must be performed to see what element of the following is of concern:

1) Fuel delivery
2) Ignition spark
3) Air coming into the intake -- either restricted or too much
4) Exhaust flow restricted

Is there a check engine warning light illuminated? If so, testing can start there to find out what trouble codes might be present, aiding with clues as to where to start looking for your problem.
If not, each system I listed must be tested to see if it is working properly. A well trained technician with a good diagnostic tool that has data monitoring capabilities and a shop manual to use for reference will be able to get to the bottom of your concern with little difficulty.
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General Diagnosis
$88 - $111 Learn More
on September 20, 2017
Hello,

Black exhaust typically indicates that your vehicle is using excess fuel.

The vehicle needs to have some testing in regarding engine performance.

Testing must be performed to see what element of the following is of concern:

1) Fuel delivery
2) Ignition spark
3) Air coming into the intake -- either restricted or too much
4) Exhaust flow restricted

Is there a check engine warning light illuminated? If so, testing can start there to find out what trouble codes might be present, aiding with clues as to where to start looking for your problem.
If not, each system I listed must be tested to see if it is working properly. A well trained technician with a good diagnostic tool that has data monitoring capabilities and a shop manual to use for reference will be able to get to the bottom of your concern with little difficulty.
Sign in to reply

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