Misfire mystery

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Feb 17, 2026 | 05:31 PM

#11

Xtract

Thread Starter

Joined: 02-16-2026

Posts: 6

What would be the best way to verify valve health outside of removing the head?

Feb 17, 2026 | 05:43 PM

#12

donbrew

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Joined: 01-23-2009

Posts: 26,541

From: Fredericksburg,VA

A) compression test
B) a camera

I guess you are calling the lash adjusters lifters.
I had a detached retina fixed last Saturday, reading is difficult.

Feb 17, 2026 | 06:33 PM

#13

Oldblue

Administrator

Joined: 10-13-2011

Posts: 40,097

From: Welland,Ont Canada

A boroscope camera works well, inserted into the spark plug holes to look at the top of tge piston for crescent moon marks indicating the valves have struck the piston.

Feb 17, 2026 | 08:05 PM

#14

RJ_RS_SS_350

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Joined: 05-01-2014

Posts: 8,512

From: California

Cylinder leak down test would also show a valve issue.

Feb 23, 2026 | 01:51 PM

#15

Xtract

Thread Starter

Joined: 02-16-2026

Posts: 6

Thank you all for this advice! I've ordered a scope and leak down tester! I will report back with an update once I've completed these tests and had the CPS relearn process programmed!