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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="DOWNS" data-source="post: 440309" data-attributes="member: 21038"><p>Yeah, just buy a fuel pressure gauge anyway. It's a good number to keep track of when doing other maintenance. Can give you a heads-up on a weak pump or a failing check valve or FPR. </p><p></p><p>Starting spray is...meh. I can use starting spray to make an engine with no carb at all on the intake manifold run. Spark tester can get you going in right direction if it shows no spark. </p><p></p><p>The Crank position sensor gets blamed a lot, and there's no telling how many of those have been wastefully changed when the issue all along was bad grounds or some other issue. If you've never replaced the battery and ground cables, just do that. They can look fine externally, but be a tube full of corrosion that causes electrical gremlins. I'm not saying it's not that, I'm just saying I would troubleshoot more before going down that hole. At least the 2.5's crank sensor is pretty easy to replace. </p><p></p><p>A multimeter is your best friend, especially on Renix based systems. Even the 10 dollar one from harbor freight will get the job done.</p></blockquote><p></p>
[QUOTE="DOWNS, post: 440309, member: 21038"] Yeah, just buy a fuel pressure gauge anyway. It's a good number to keep track of when doing other maintenance. Can give you a heads-up on a weak pump or a failing check valve or FPR. Starting spray is...meh. I can use starting spray to make an engine with no carb at all on the intake manifold run. Spark tester can get you going in right direction if it shows no spark. The Crank position sensor gets blamed a lot, and there's no telling how many of those have been wastefully changed when the issue all along was bad grounds or some other issue. If you've never replaced the battery and ground cables, just do that. They can look fine externally, but be a tube full of corrosion that causes electrical gremlins. I'm not saying it's not that, I'm just saying I would troubleshoot more before going down that hole. At least the 2.5's crank sensor is pretty easy to replace. A multimeter is your best friend, especially on Renix based systems. Even the 10 dollar one from harbor freight will get the job done. [/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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