dsacton
Contributor
Posts: 383
Loc: Boulder, CO
Reg: 11-01-11
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06-11-12 07:08 PM - Post#2236004
In response to Gibsons
Steve,
I'm pretty much a newbie at this stuff, but thought I would weigh in anyhow. I don't suppose you will get any ideas from me that you have not considered yet...but, hey this is what the CT forum is for, right?
Three things go into an ignition process: fuel, spark, and compression. Compression you have eliminated, but it is hard to see how you could have a serious cam issue without it showing up on a compression test. Somewhere on CT there is a thread that describeds what you should see for compression in each cycle or mode of the running engine. A single scalar value is not sufficient to say that the compression is OK.
I am assuming that you have put your timing light on all three of the back spark-plug wires, and confirmed that you have consistent and uniform spark.
In looking at my intake manifold ('54), it is interesting how the back three cylindars share a common 1/2 of the manifold. Is if possible that fuel is having a hard time getting to the back three? The butterfly valve on my car opens at a slant that, under some circumstances, would give preference to the from three cylinders. How does it run with the throttle 100% open?
The same question with regards to the exhaust manifold. What about that little thermally controled valve down by the exhaust manifold. Could that be broken or stuck in a position that favors the front three cylinders?
Longshots, I realize. Good luck!
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