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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 22990
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Backfiring and smoke coming out of tailpipes, loose engine

Customer Question

Backfiring and white smoke coming out of tailpipes, loose engine power, 2009 Cadillac STS, smells of gas
Submitted: 11 months ago.
Category: Cadillac
Expert:  david craig replied 11 months ago.

Hi Im David. with those symptoms, it sounds like a timing issue. fault codes will need to be pulled from the computer before anything else.

Customer: replied 11 months ago.
I'm being told that I need to have 2,000.00 worth of work done because they have to tear down the passenger side of the engine and replace everything..fuel injection system
Expert:  david craig replied 11 months ago.

Dont fall for that. ask them what fault codes were found. ask them if they checked the injectors for pulse. ansk the if they did a compression test. before you let them do anything.

Customer: replied 11 months ago.
I'll ask them this morning and get back to you
Expert:  david craig replied 11 months ago.

ok. because certain thing need to be tested before they start ripping apart the engine.

Expert:  david craig replied 11 months ago.

do you still need assistance?

Expert:  david craig replied 11 months ago.


Expert:  sprinkles08 replied 11 months ago.

Hello and welcome to JustAnswer!

The white smoke from the tailpipe is almost surely from unburned fuel if you also have a fuel smell. Burning coolant would produce white smoke but if you're smelling fuel I don't think that's the case.

If you have enough fuel leaving unburned then you have an injector that's stuck on, whether it's a mechanical failure of the injector, a shorted injector driver circuit in the harness or a driver stuck on in the powertrain control module. Were you ever able to find out what fault codes were setting, or the actual repair that was recommended?

Customer: replied 11 months ago.
I wast told that the enjector( piston) stuck open, shoild have the car back tomorrow, they told me this is a common problem with the 2009 Cadillac 2009 STS.
Expert:  sprinkles08 replied 11 months ago.

A failed injector is very likely to be the cause.