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Jeep Wrangler YJ
YJ General Discussion
1991 2.5 doesn't like to start when engine is hot
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<blockquote data-quote="deadpool1" data-source="post: 440281" data-attributes="member: 21229"><p>lost spark or not when dead the test to find this is 100 years old ,unchanged.</p><p>if spark is good, and engine is presumed good 30+ years old. then we </p><p>add air. right foot %5 throttle cranking to add air to hide bad iAC (just for the start) it may stall if foot is raised at the starts now event.</p><p>if its flooding, as in spark tips soaking in fuel (oil or antifreeze) we crank WOT, WIDE OPEN THROTTLE, THIS CLEARS THE FLOOD, WOT CRANKS CUTS THE INJECTORS DEAD. FOR THE CRANK.</p><p>AND LAST TEST FUEL , SPRAY AS MY SCOTTY POST CLEARLY SHOWS ABOVE. (instant start spray in a can sold at all autostores)</p><p> this hides dead fuel pressure problems.</p><p>lots causes do not go to the dark side and modify the jeep engine EFI system now. just do the test, and work the problem to a logical conclusion.</p><p><strong>if spark is lost</strong>, check out why at the ASD relay. ask.</p><p></p><p>ASD cuts fuel and spark both, if it sees ASD output overloaded, even shorted 02 sensors, shorts. see wires shorting at the 02 yet a very common failure on all cars. shorted injector wires. shorted primary spark coil or any of those intermittent.</p><p></p><p>do the tests at the FAILURE< will not start.</p><p>work quickly</p><p></p><p>the 10min dead symptom, hints flooding to me but is just wise guess. base on time factor.</p><p>WOT cranking the ECU detects you doing that and cuts all fuel at the injectors.</p><p>called WOT unflood mode,</p><p></p><p><a href="https://www.youtube.com/watch?v=064Ilsz8Fzg" target="_blank">watch scotty.</a></p></blockquote><p></p>
[QUOTE="deadpool1, post: 440281, member: 21229"] lost spark or not when dead the test to find this is 100 years old ,unchanged. if spark is good, and engine is presumed good 30+ years old. then we add air. right foot %5 throttle cranking to add air to hide bad iAC (just for the start) it may stall if foot is raised at the starts now event. if its flooding, as in spark tips soaking in fuel (oil or antifreeze) we crank WOT, WIDE OPEN THROTTLE, THIS CLEARS THE FLOOD, WOT CRANKS CUTS THE INJECTORS DEAD. FOR THE CRANK. AND LAST TEST FUEL , SPRAY AS MY SCOTTY POST CLEARLY SHOWS ABOVE. (instant start spray in a can sold at all autostores) this hides dead fuel pressure problems. lots causes do not go to the dark side and modify the jeep engine EFI system now. just do the test, and work the problem to a logical conclusion. [B]if spark is lost[/B], check out why at the ASD relay. ask. ASD cuts fuel and spark both, if it sees ASD output overloaded, even shorted 02 sensors, shorts. see wires shorting at the 02 yet a very common failure on all cars. shorted injector wires. shorted primary spark coil or any of those intermittent. do the tests at the FAILURE< will not start. work quickly the 10min dead symptom, hints flooding to me but is just wise guess. base on time factor. WOT cranking the ECU detects you doing that and cuts all fuel at the injectors. called WOT unflood mode, [URL='https://www.youtube.com/watch?v=064Ilsz8Fzg']watch scotty.[/URL] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
1991 2.5 doesn't like to start when engine is hot
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