Misfire codes on cylinder one and six

Tiny
V LUCIO
  • MEMBER
  • 2005 CADILLAC SRX
  • 3.6L
  • V6
  • RWD
  • AUTOMATIC
  • 119,000 MILES
When it is at idle it shake, but when driving it drives fine. The misfiring codes that pop up are cylinder one and cylinder six and a random misfire. I changed all the plugs replaced the coil on cylinder six and it still pops up as cylinder six and cylinder one. So I swapped the cylinder six injector with cylinder two to see if the code would jump to cylinder two and it is still at cylinder six. What else could it be?
Thursday, October 20th, 2016 AT 6:24 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,859 POSTS
Hello V,

This could be an intake valve leak, can you remove all of the plugs and do a compression test, we are looking for one low cylinder that would leak combustion into the intake manifold which would affect 1 and 6.

Here is a guide.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please let us know what you find so it will help others.

Best, Ken

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Monday, October 24th, 2016 AT 7:23 PM

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