Hi Steve, I also wanted to mention a couple of other little variables that could influence your readings. The rubber seal at the dipstick and consider adding a hose clamp where the plastic oil filler neck slips over the metal oil filler tube- it's junction is right in them middle of the alternator belt's path. It seems that these two items have a tendency to allow "false air" to enter the system, that why they are sealed. The oil filler is just a friction fit over a raised lip in the steel pipe. Since they are source of additional un-metered air their effect is a lean idle. Also on the emissions side of things, crankcase oil can have gas in it which also would be a false reading point. I think this last point get's overlooked, but it seems I read a considerable number factors that need to be address, but basically baby the oil until your done testing. Avoid lots of cold starts without letting the engine oil recover from the rich mixture, the testing instructions in your CO meter may address this too. An oil change along the way could give your more accurate readings too. Sincerely, Mark Keller 91 Carat Cowichan Bay, BC |
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