How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 22136
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
Type Your Cadillac Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

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: 5 months ago.
Category: Cadillac
Expert:  david craig replied 5 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 5 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 5 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 5 months ago.
I'll ask them this morning and get back to you
Expert:  david craig replied 5 months ago.

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

Expert:  david craig replied 5 months ago.

do you still need assistance?

Expert:  david craig replied 5 months ago.


Expert:  sprinkles08 replied 5 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 5 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 5 months ago.

A failed injector is very likely to be the cause.