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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,776
Check/replace plugs or more might be misfiring only when under load.

The recurring thread here, if I'm reading all the facts correctly, is that the misfire (when it happens) is always under boost conditions, whereas light load (i.e., no appreciably boost) she runs fine. Which leads to one other possibility - that you have a dried out or dislodged seal or two on the IC and/or turbo pipe plumbing. Under boost is when you would notice that the most, as you would be leaking out the already metered air before the throttle body and end up with the pig-richies to where she sputters and generally runs like $hit 'cause your AFR's have dropped off the scale. With a minor seal or o'ring leak it may not open up enough until you start cramming boost air in there.
Isn't CIS fun?
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 07-27-2010, 02:21 PM
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