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Scott K
Scott K, ASE Master Tech/Instructor
Category: Car
Satisfied Customers: 1569
Experience:  20 yrs exp. Electrical; Driveabilty; Undercar; Airconditioning. Domestic and Foreign.
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Heavy black smoke coming from exhaust pipes, what is ...

Resolved Question:

Heavy black smoke coming from exhaust pipes, what is causing the problem?
Submitted: 8 years ago.
Category: Car
Expert:  Scott K replied 8 years ago.


Welcome to Just Answer,

Heavy black smoke typically means a very rich mixture, causes of this could be a leaking fuel pressure regulator diagphram, an Injector stuck open, A faulty PCM or wiring grounded from injector.

Remove vacuum line from fuel pressure regulator and if gasoline is present diagphram is leaking. To test for a leaking fuel injector is a bit more involved. It requires a balance tester.

Object Number: 20434  Size: SH

Object Number: 190817  Size: SH


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