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Jeep Wrangler YJ
YJ General Discussion
My 1995 YJ misfire issue
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<blockquote data-quote="Rio95" data-source="post: 437615" data-attributes="member: 20874"><p>Hello,</p><p></p><p>I’m new to the forum, my name is Nick. thanks for the add!</p><p></p><p>Looking for help. I am pulling my hair out…</p><p>I have a 1995 YJ 4cyl w about 100k on it.</p><p>Recently it started misfiring when at idle, and under load. I got a check engine light and the code I got was TPS sensor. Replaced that and the code went away. But the misfire stayed…</p><p></p><p>I have replaced all the following and it is still misfiring..</p><p></p><p>Spark plugs and wires</p><p>New distributor</p><p>Ignition coil</p><p>Fuel filter</p><p>Fuel rail and fuel injectors</p><p>Tested injector wires with noid light</p><p>New MAP sensor</p><p>Throttle position sensor</p><p>Idle air control</p><p>Crankshaft position sensor</p><p>Air charge sensor</p><p>Coolant temp sensor</p><p>Checked valve springs</p><p>New valve cover seal</p><p>Changed battery ground cable</p><p>Ground to fuel injector</p><p>Fuel pressure good</p><p>Compression good</p><p>No head gasket leak</p><p>Pigtail for distributor connection</p><p>Pigtail for injector 3</p><p>Checked grounds and used grinder to expose metal</p><p></p><p></p><p>Note- after changing the valve cover seal (checked valve springs) the misfire was gone but only for about two hours… hasn’t gone away since. I assumed I moved a wire so I’ve been chasing the electric gremlin the last few weeks…</p><p></p><p>I have had numerous mechanics try to diagnose the issue, no luck…</p><p></p><p>Anyone have advice for me? Or anyone recommend a Jeep specialist near cape cod, MA? I’m on Nantucket.</p><p></p><p>Best,</p><p>Nick</p><p></p><p>[ATTACH=full]121088[/ATTACH]</p></blockquote><p></p>
[QUOTE="Rio95, post: 437615, member: 20874"] Hello, I’m new to the forum, my name is Nick. thanks for the add! Looking for help. I am pulling my hair out… I have a 1995 YJ 4cyl w about 100k on it. Recently it started misfiring when at idle, and under load. I got a check engine light and the code I got was TPS sensor. Replaced that and the code went away. But the misfire stayed… I have replaced all the following and it is still misfiring.. Spark plugs and wires New distributor Ignition coil Fuel filter Fuel rail and fuel injectors Tested injector wires with noid light New MAP sensor Throttle position sensor Idle air control Crankshaft position sensor Air charge sensor Coolant temp sensor Checked valve springs New valve cover seal Changed battery ground cable Ground to fuel injector Fuel pressure good Compression good No head gasket leak Pigtail for distributor connection Pigtail for injector 3 Checked grounds and used grinder to expose metal Note- after changing the valve cover seal (checked valve springs) the misfire was gone but only for about two hours… hasn’t gone away since. I assumed I moved a wire so I’ve been chasing the electric gremlin the last few weeks… I have had numerous mechanics try to diagnose the issue, no luck… Anyone have advice for me? Or anyone recommend a Jeep specialist near cape cod, MA? I’m on Nantucket. Best, Nick [ATTACH type="full" alt="E963286B-5989-49FD-84CB-6B81F61ABCF0.jpeg"]121088[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
My 1995 YJ misfire issue
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