| Long story short, I purchased a roller Z a few years back which came with an engine that I am only now getting around to trying to start. The engine will turn over however about all I get is a lot of backfiring. It occurs about every second depending on where I set the cas. Adjusting the cas also seems to affect how hard it backfires. I realize this sounds like an obvious timing issue however I have verified the following:
- timing is on
- ptu ohms out ok
- injectors ohm out ok
- all plugs spark when spinning cas
- all injectors click when spinning cas
- compression is decent across the board although a few cylinders take many cranks before the compression gauge stops moving (I assume due to leak down issues/blow by). Things I haven't tested:
- firing order
- clogged injectors
- leaky injectors
- fuel pressure
- valves seating/bent (no idea how to test this) I've not yet had the time to run these tests as I can only work on the car on the weekend. My main reason for posting is to get some feedback/ideas so I can utilize my time wisely this coming weekend as well as get some parts on order if needed. Thanks in advance for any help.
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