Hey Guys,
After some opinions and potential ideas on a problem I have.
I bought a 3.0 that was rebuilt, hadn't been started and was good to go as far as I was aware.
I have finished building the itb intake, wiring it etc and went for a run on the dyno to get a tune. We had a few dramas (as you always do on dyno day) and while diagnosing issues we pulled the spark plugs, only to find cylinder one plug looked brand new, nothing had ignited in that cylinder.
We then pulled out the laptop and did a test on the spark, all ok. Then tested the injector, again ok. Then tested the compression and only have 90psi. The other 5 cylinders all have 190-195psi.
We took it off the dyno and I suspected it may have been the valve adjustment too tight, pushing the valves open ever so slightly. I adjusted the valves on cylinder one to be loose to ensure the rockers weren't going to be holding it open and did a compression test. Still only 90psi.
To ensure it was the valves I put some oil in the cylinder to try and see if that raised the compression and eliminate it being the rings. Still 90psi.
So I am fairly confident it is the valves not seating correctly.
Has anyone else had an issue similar?
Do I have any tricks I can try before pulling the motor and subsequently the head(s)?
Am I way off and its actually something else?
