Holley Sniper 2GC to 2F Install using Mosley Motors adapter (4 Viewers)

[wngrog]

I would think a valve would have to be way loose to cause that but it's worth popping the cover off to check.

I've had a couple customers DUI ignition module die but it kills the engine and you won't get the spark to run at all.

 

[Jdc1]

Yes, Along with checking the timing, vacuum caps and lines, I put in new spark plugs, and a new O2 sensor. With the help of the forum I have been able to go a few steps further and rule out a few more things.

If the ECU is good, could a bad HEI Coil cause that miss?

Is a valve spring, rocker, or something else in the top end a possibility?

Worth checking the valve lash. One of the first things our local engine guru checks on an engine. And you’ll be able to check that off the list of potentials. Have you checked for spark at the plugs?

If you’ve seen Royalty Auto service on FB, he fixed a misfire code on an S2000 with a valve adjustment.

 

[FJ60Cam]

Do you have any videos of it running awesome to compare to?

The latest video looks like everything is working like it’s supposed to Sniper-wise and not chasing its tail. No weird rpm glitching

I’m only going off listening to the video - if I was standing there I’d add more timing to see if it sounded better and got more responsive.

Do you have a digital gun or are eyeballing it?