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#11 |
![]() Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,384
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Dry soot vs Oily soot on plugs would indicate fuel or spark issue as opposed to oil fouling from guides or rings. 4 & 8 are not paired cylinders so it would require 2 coil or 2 plug wire issues.
No fuel pressure leak-down would indicate the injectors are not at fault mechanically. Question: is the engine missing? Have you tried a low rpm (12~1500 rpm) pull in 6th gear? Does the engine buck or does it pull smoothly/gradually? Weak spark is usually the culprit if engine acts like it has modified camshafts. Also of note: You mentioned the ECM being replaced. What is the background on the replacement ECM? Used, reconditioned, new, known to be good by test in another ZR-1?
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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