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Old 08-21-2020, 09:15 PM
Kaajot Kaajot is offline
Micro Machine Manager
Join Date: Jul 2014
Location: Bumblebee's Junkyard
Posts: 268
Kaajot is an unknown quantity at this point
Leak Down Check Complete

Not great....

Triggered the Check Engine light that has been off for months upon months by doing these tests.

Broke a spark plug, going to put a new one in the morning in.

Tests show Compression at 90 or so and all but one are below the MINIMUM 78.5 (one was 80 on the leak). There is a hiss out of the engine service cap of the engine during these. No bubbling from radiator either.

When parked but on, pulling Spark Plug #1 off the distributor does not affect idle.

#1 Cylinder appears to be providing some power during driving as it has the broken spark plug right now and it was much worse.

There is skipping from #1 that can be heard/felt prior to breaking the spark plug.

Unsure what's going on with this engine.

The Heat Tab on the back was not melted. Did not overheat the engine.

I guess the theory is possibly the valves are not seated or piston rings are not seated or the engine needs more than 6K miles of break-in driving? Keith also theorized doing the oil change its due for right now and putting straight 30W Conentional in for further break-in.

Have to call S&J on Monday to see waht they will say. At least I didn't overheat the engine, so the warranty is intact.
1992 F-150 Custom "Red IX"
1991 F-250 302 5.0 Plowtruck Project
1983 F-700 10K Dump Truck, no CLD Req'd :-)

"Not too impressed.... often."
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