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 Dave Nova Your Own Question
Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
11042942
Type Your Cadillac Question Here...
Dave Nova is online now
A new question is answered every 9 seconds

2008 CADILLAC CTS 3.6L WITH 164,000 MILES. VEHICLE HAS

Customer Question

2008 CADILLAC CTS 3.6L WITH 164,000 MILES.
VEHICLE HAS MULTIPLE MISFIRES. ONLY CYLINDER 1 AND 3 MISFIRE. NEW SPARK PLUGS AND STILL DOING IT. ALL CYLINDERS HAVE A COMPRESSION AROUND 120 PSI. WHAT COULD BE THE PROBLEM? THANKS
Submitted: 9 months ago.
Category: Cadillac
Expert:  Ryan Schott replied 9 months ago.

Have you swapped the coils at all? and the bad news for being bank 1 is there is an updated head for this year as they had a lot of problems with misfires on that bank, if you end up getting a head make sure to get new actuators as well the new design requires 2012 or newer actuators. was there any evidence of oil in your spark plug tubes?

Customer: replied 9 months ago.
we swapped coils with no change. No evidence of oil.
Customer: replied 9 months ago.
Would it need a head if the compression is around 120 psi?
Expert:  Ryan Schott replied 9 months ago.

have you done a leak down test on the suspect cylinders? this can often find problems not seen in a compression test. can you shoot me your vin so i can check which model 3.6 you have

Customer: replied 9 months ago.
1g6df577180209231
Customer: replied 9 months ago.
No that hasn't been done as of yet. I'll speak to my mechanic.
Expert:  Ryan Schott replied 9 months ago.

ok you have an ly7 engine so i would check injector flow and suck in a lot of top end cleaner through a vaccum line as these can get a lot of carbon on the valves, if you have leakage on the leakdown test, cleaning the valves this way can often fix it.

Customer: replied 9 months ago.
Ok I'll let you know. Thanks