Random misfire

Tiny
KEVIN MELTON
  • MEMBER
  • 2006 NISSAN FRONTIER
  • 4.0L
  • V6
  • AUTOMATIC
  • 205,000 MILES
I am having a problem with misfire I check cylinders one through five by taking coil off no result. I took two cylinder coil off engine gets weak. I replaced coil packs and boots. I replaced all the plugs, replaced both valve covers, a variable valve timing solenoid. I disconnected the fuel Injector that runs to cylinder two and before I tried that it makes a loud popping sound even with the fuel injector disconnected. Can you please tell me what I need to do?
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Sunday, July 16th, 2017 AT 7:00 PM

6 Replies

Tiny
MHPAUTOS
  • EXPERT
Start with a compression test and please post the results.

Here is a guide to help you:

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

Please let us know what happens.
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Monday, July 17th, 2017 AT 4:58 AM
Tiny
KEVIN MELTON
  • MEMBER
Okay, I think I have a stuck valve and no idea how to free it.
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Monday, July 17th, 2017 AT 10:04 AM
Tiny
KEVIN MELTON
  • MEMBER
Okay, I did a compression test both cylinders two and four were 150.
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Monday, July 17th, 2017 AT 12:34 PM
Tiny
KEN
  • ADMIN
Hello,

Can you do the rest of the cylinders becasue if you have a burnt intake valve it will effect the remaining cylinders.

Please let us know what you find.

Cheers, Ken
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Tuesday, July 18th, 2017 AT 10:09 AM
Tiny
KEVIN MELTON
  • MEMBER
Did the rest of the cylinder 120 all around
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Tuesday, July 18th, 2017 AT 7:23 PM
Tiny
KEN
  • ADMIN
Does it seem like the engine is misfiring in a constant rhythm or completely random?
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Wednesday, July 19th, 2017 AT 10:55 AM

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