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 john -aka eauto Your Own Question
john -aka eauto
john -aka eauto, The Car Guy
Category: Cadillac
Satisfied Customers: 16286
Experience:  15 years as a auto tech
Type Your Cadillac Question Here...
john -aka eauto is online now
A new question is answered every 9 seconds

2006 Cadillac CTS: cylinders..running rough..idle and at stable speeds

This answer was rated:

I have a 2006 Cadillac CTS w/53k miles showing misfire codes on cylinders 2, 4, & 6 (all same side). The car is running rough in idle and at stable speeds, it only evens out during acceleration. This problem started overnight, not gradually. Is this an electrical problem or might I be able to just solve with fuel injector cleaner and/or replacing the fuel filter?
how many miles on the car?
Customer: replied 7 years ago.

Most missfires are spark plug or coil related ..... I would start with spark plugs and a check of the ignition coils for signs of arching or burning


Customer: replied 7 years ago.

Why would all 3 spark plugs (2,4, & 6) go out simultaneously on one side of the engine though? I've never heard of 3 plugs or coils (they are mounted on the plug) going out at the same time

they have been know to, one easy way to tell if there is no damage is to move the coils to 1 3 and 5 and see if the miss fires move ...if they do you just solved your issue.

it could be a wireing issue to the injectores it could be a clogged injector rail it could be a head or intake gasket leak, some basic trouble shooting will be required to pinpoint the issue

Customer: replied 7 years ago.
Ok, you don't think bad gas would be the reason? I'll pay you after this one...
Customer: replied 7 years ago.
Relist: Incomplete answer.

its very unlikley, i would check the plugs and coiuls first

you can try a fuel system treatment like chevron techtron and see if it clears it up

john -aka eauto and 4 other Cadillac Specialists are ready to help you