Tracking down a mystery misfire

Reply Subscribe

Thread Tools

Search this Thread

Dec 31, 2023 | 02:23 AM

#41

czerta

Thread Starter

Three Wheeling

Joined: Aug 2022

Posts: 59

Likes: 12

Quote:

Originally Posted by JohnZo

If valve stem seal is not seated, it will easily lift off. But check compression first, all cylinders with all the plugs out and throttle blocked open, fuel pump disabled.

Understood, thanks.
Compression tester on the way

Jan 4, 2024 | 07:12 PM

#42

disco96sd

Recovery Vehicle

Joined: Dec 2019

Posts: 1,006

Likes: 200

swap coil and plug to another cylinder - if misfire follows you know your issue

I would put in a new coil - set of plugs and leads

Jan 4, 2024 | 08:09 PM

#43

czerta

Thread Starter

Three Wheeling

Joined: Aug 2022

Posts: 59

Likes: 12

Quote:

Originally Posted by disco96sd

swap coil and plug to another cylinder - if misfire follows you know your issue

I would put in a new coil - set of plugs and leads

All coils are new, plugs are a couple hundred mi old at most and same with wires.
Waiting on compression tester.

Mar 15, 2026 | 11:05 AM

#44

augustwillo

Drifting

Joined: Aug 2012

Posts: 38

Likes: 5

From: Oregon and Wisconsin

Quote:

Originally Posted by czerta

All coils are new, plugs are a couple hundred mi old at most and same with wires.
Waiting on compression tester.

Curious to what the outcome was from the compression test and if you found a solve for your misfires?

I’m chasing a P0306, P1313 and P1316. Can’t seem to find the issue.

my cyil 7 and 5 are both under 30psi, but still not sure why.