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96 Merc 9.9 revs out in reverse, but not forward??
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<blockquote data-quote="Redthies" data-source="post: 397055" data-attributes="member: 19640"><p>I spent some time on the phone with a couple of Merc dealer techs, and got a few responses. Base gasket turned to mush, exhaust carbon build up/tarring, carb clogged, coil cracked/broken and on and on. </p><p>Some times it's really simple though. I figured I'd change the plugs and test spark, and while doing that I went back and forth a few times from cylinder to cylinder and noticed one with lower spark. Tried swapping plug wires from one to the other and while doing that I felt a "soft" spot in the longer plug wire. Cut the wire at the soft spot and there it wasn't! The plug wire had completely corroded through at that spot. I pulled the coil end crimp off, moved it to good side of the wire, plugged it back in and next thing I know I'm doing 20 mph +/-! </p><p>I figured I'd post up the solution here as when I was researching this, 90% or more of the threads I read the OP never posted what his outcome was. It's hard enough to diagnose things over the web, but even harder when you read a bunch of problems but don't see any results. I wouldn't have thought my engine was only running on one cylinder because it started so easily and ran so smoothly! Hope this helps somebody else.</p></blockquote><p></p>
[QUOTE="Redthies, post: 397055, member: 19640"] I spent some time on the phone with a couple of Merc dealer techs, and got a few responses. Base gasket turned to mush, exhaust carbon build up/tarring, carb clogged, coil cracked/broken and on and on. Some times it's really simple though. I figured I'd change the plugs and test spark, and while doing that I went back and forth a few times from cylinder to cylinder and noticed one with lower spark. Tried swapping plug wires from one to the other and while doing that I felt a "soft" spot in the longer plug wire. Cut the wire at the soft spot and there it wasn't! The plug wire had completely corroded through at that spot. I pulled the coil end crimp off, moved it to good side of the wire, plugged it back in and next thing I know I'm doing 20 mph +/-! I figured I'd post up the solution here as when I was researching this, 90% or more of the threads I read the OP never posted what his outcome was. It's hard enough to diagnose things over the web, but even harder when you read a bunch of problems but don't see any results. I wouldn't have thought my engine was only running on one cylinder because it started so easily and ran so smoothly! Hope this helps somebody else. [/QUOTE]
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96 Merc 9.9 revs out in reverse, but not forward??
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