CAMARO6 - View Single Post - Stock Intake Valve Seat Failure on TSP PRC Ported Heads with Big Cam

cmitchell17 · 02-20-2021, 11:40 PM

So I changed the oil last weekend I think and only drove the car a few times since then.

I was actually taking a HP Tuners log when it happened, but everything really looks normal, the only sign of the misfire is the rapid cycling, far higher than the normal switching frequency, that I drew an arrow too:
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Views: 985
Size: 192.8 KB

So it started misfiring right after a WOT pull from dead stop to 3rd gear.

Tomorrow I am going to try to look for for some valves to make a valve cut off to do a leakdown. I might just buy a harbor freight one if they have it though. I did also check cylinder #5 and #3 and they were at 182 psi and 178 psi.

02-20-2021, 11:40 PM	#14
cmitchell17 Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016 Location: US Posts: 1,204	So I changed the oil last weekend I think and only drove the car a few times since then. I was actually taking a HP Tuners log when it happened, but everything really looks normal, the only sign of the misfire is the rapid cycling, far higher than the normal switching frequency, that I drew an arrow too: So it started misfiring right after a WOT pull from dead stop to 3rd gear. Tomorrow I am going to try to look for for some valves to make a valve cut off to do a leakdown. I might just buy a harbor freight one if they have it though. I did also check cylinder #5 and #3 and they were at 182 psi and 178 psi.