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So I’ve been dealing with misfire codes on all cylinders for some time, took my car to have my head rebuilt at InlinePro about 40k ago, turned out to be bent intake valves. Got my head rebuilt with AP2 components, and the car ran good. A little over a year later my misfire codes come back. I took out my plugs and did a compression test:
cylinder 1- 170
cylinder 2- 90
cylinder 3- 150
cylinder 4- 180
Is this an issue with the block? Here are pics of the spark plugs
How long were you driving around with misfires, a simple ignition misfire going untreated can cause excess fuel to wash out a cylinder. Low compression can be caused by many things including valve adjustment.
A leakdown test is def the next step imo as is checking the valve adjustment
If loose guides, or a bent valve, it could have ovaled the valve seat. Did they recondition or replace the seats, or lap new valves, or install new guides?
How long were you driving around with misfires, a simple ignition misfire going untreated can cause excess fuel to wash out a cylinder. Low compression can be caused by many things including valve adjustment.
A leakdown test is def the next step imo as is checking the valve adjustment
I’ve been driving the car on weekends for about 3 months with the CEL on just ignoring it. It’s been 40k since the head rebuild and Valve adjustment
If loose guides, or a bent valve, it could have ovaled the valve seat. Did they recondition or replace the seats, or lap new valves, or install new guides?
originally the car had bent intake valves and InlinePro put in a used F22C head. They put in New AP2 keepers and new valve guide seals. Then hot tank/soda blasted valves and bases. Compression was even across all cylinders after the rebuild 180-190.
06-01-2019, 11:38 AM
AP1 Low Compression After Head Rebuild
