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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?
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Thursday, October 20th, 2016 AT 6:24 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,878 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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