So Mitch and I did some testing. Car has mk4 headgasket, autotech 268º cams. Misfire has existed since engine went in (when cams/headgasket happened)
Wiring is good, we have continuity across the harness. Front cylinders compression was over 200 across the board. They were all right around 210
Leakdown revealed 90/85 cylinder 1, 95/90 cylinder 3 and 95/90 cylinder 6. Theres a 1% leakdown on 3 and 6 and about 5-6% on cylinder 1. Not terrible but its showing some leakage on cylinder one.
Now here's where it gets interesting. Cylinder 1 is a bit wet with what appears to be oil. Not alot but a little. Air is not leaking from overflow bottle, at tailpipe, oil cap or throttle body/egr/valve cover. The slight leak appears to be at piston ring. It's holding steady when under air but is a bit low so it's obvious theres a little leak.
Could the misfire come from a bit of oil blowing past the rings? We also heard a bit of clatter from the cylinder 1 side of the engine. Possibly the misfire slapping the valve closed or popping off it?
right now were gonna swap injectors/test them before we look at rebuilding the bottomend.
any insight?
Wiring is good, we have continuity across the harness. Front cylinders compression was over 200 across the board. They were all right around 210
Leakdown revealed 90/85 cylinder 1, 95/90 cylinder 3 and 95/90 cylinder 6. Theres a 1% leakdown on 3 and 6 and about 5-6% on cylinder 1. Not terrible but its showing some leakage on cylinder one.
Now here's where it gets interesting. Cylinder 1 is a bit wet with what appears to be oil. Not alot but a little. Air is not leaking from overflow bottle, at tailpipe, oil cap or throttle body/egr/valve cover. The slight leak appears to be at piston ring. It's holding steady when under air but is a bit low so it's obvious theres a little leak.
Could the misfire come from a bit of oil blowing past the rings? We also heard a bit of clatter from the cylinder 1 side of the engine. Possibly the misfire slapping the valve closed or popping off it?
right now were gonna swap injectors/test them before we look at rebuilding the bottomend.
any insight?