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StephenVA · #6 12-22-2016, 11:09 AM

Quote:

Originally Posted by Gray035

Yes. This is helpful. I've already completed most of this list:

(1) 1K on new spark plugs
(2) haven't checked fuel pressure yet
(3) the air intake has been smoke tested...will replace DISA O-ring. The DISA itself appears to be in good working order.
(4) Need to look into oil separator (aka CCV right?), but PO said it was replaced. No mayo under oil cap.
(5) the misfire is stays on cyl 5 even though coil has been moved (need to inspect spark plug and switch that to another cyl to see if any effect).

I think there's not much more I can do while I'm waiting for DISA O-ring. Once that leak is plugged I can continue trouble shooting.

Thanks for the insight.
You only need three things to make a internal combustion engine to run> Fuel, spark and compression. That is it.
If the issue is Cyl five, then I would recommend a few simple tests, Pull plug> Fuel fouled - oil fouled? Dry as toast?

Quick tests: Replace plug (it only 5 bucks) Run better or same? NO?
With the plug installed, start the engine run at idle. Does each injector click with the same pacing, especially #5? Just place your finger on it you will feel it. There are lots of tools out there to read the signal it self if the answer is NO.
Quick Fuel pressure test. The rail has a Schrader type valve on it. Connect a fuel pressure gauge. (you can buy or rent one). Replace fuel filter if not done on your watch. While you are there grab a fuel sample and look up Fuel testing for water) The water in fuel test> Here is what is done on aircraft...
Find the low point on the fuel system and drain out a fair amount into a clear glass container and let it sit for a minute. IF there is water in the fuel it will appear on the bottom of the container in "drops." It is easy to spot and proves the point water is heavier than fuel and for sure doesn't mix with it.

Quick cylinder compression test, using a compression test gauge (Sears sells 'em). All within 10% of each other and over 135? Note Must be done with all the plugs removed. Lots of info this procedure all over the internet.

This will get you started.

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