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Jeep Wrangler YJ
YJ General Discussion
91 Jeep YJ - Cranks but No start - Have spark and have fuel at fuel rail
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<blockquote data-quote="TimberTim" data-source="post: 434433" data-attributes="member: 20208"><p>I have a 91 yj 4 cyl and I speak from this experience. My distributor timing is not operator adjustable. there's a tab on the engine block that prohibits it from being turned, the computer sets the timing from information collected from the engine parameters while it is running. That being said I had an experience similar to yours and replaced the timing chain and Timing gear and received no noticeable improvement in the engine performance. I will spare you the details and get right to my solution. i removed my exhaust manifold and inspected the underneath side to find 3 sizeable heat cracks that I could not see from above. Apparently fresh oxygen was being sucked through the cracks after the combustion process and the computer was seeing this from the oxygen senser. The computer rightfully increased the fuel ratio to richen what it perceived to be a LEAN condition. But in reality more fuel wasn't needed and it was over fueling the engine. open your hood and listen to your engine, if it seems loud you might check for exhaust leaks. I know some will call BS on this but let me say since I repaired this my YJ has passed California Smog with Flying Colors for the last 10 yrs. hope this helps</p></blockquote><p></p>
[QUOTE="TimberTim, post: 434433, member: 20208"] I have a 91 yj 4 cyl and I speak from this experience. My distributor timing is not operator adjustable. there's a tab on the engine block that prohibits it from being turned, the computer sets the timing from information collected from the engine parameters while it is running. That being said I had an experience similar to yours and replaced the timing chain and Timing gear and received no noticeable improvement in the engine performance. I will spare you the details and get right to my solution. i removed my exhaust manifold and inspected the underneath side to find 3 sizeable heat cracks that I could not see from above. Apparently fresh oxygen was being sucked through the cracks after the combustion process and the computer was seeing this from the oxygen senser. The computer rightfully increased the fuel ratio to richen what it perceived to be a LEAN condition. But in reality more fuel wasn't needed and it was over fueling the engine. open your hood and listen to your engine, if it seems loud you might check for exhaust leaks. I know some will call BS on this but let me say since I repaired this my YJ has passed California Smog with Flying Colors for the last 10 yrs. hope this helps [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
91 Jeep YJ - Cranks but No start - Have spark and have fuel at fuel rail
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