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Jeep Wrangler YJ
YJ General Discussion
Engine cutting out after warm up
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<blockquote data-quote="HDSlowride" data-source="post: 432246" data-attributes="member: 19912"><p>Still chasing this gremlin. My stock four banger starts easy, runs smooth when cold, good throttle response and pulls well. Until you get about 7 or 8 miles down the road. At first just a few sputters and misses, couple of pops and backfire. If I turn around when it starts doing this I am limping back in a much lower gear before I get home. It won't pull over 2K rpm once it starts cutting out. The warmer it gets, the worse the missing is.</p><p>I went to O'Reilly's and bought a throttle position sensor and changed it out. Didn't help at all. Repeat of the same thing. Runs good until it warms up then starts missing. I'm convinced it has to be electrical and interfering with firing but what do I know??? Ha.</p><p>So I've changed spark plugs, distributor cap and rotor button, and now TPS. I guess next I'll change the coil out. </p><p>Well, I am learning again after not wrenching on too much for many years. Noticed that it had no thermostat...don't know why. Like I say, have only had it a few days and no history is known to me. It looks as if most all of the original pollution control stuff is still in place. Mass air sensor voltage checked while running and it seems in normal range. The crank position sensor has been changed in the past (by its appearance) but these usually work, or don't work at all...correct?</p><p></p><p>Ideas appreciated, TIA</p></blockquote><p></p>
[QUOTE="HDSlowride, post: 432246, member: 19912"] Still chasing this gremlin. My stock four banger starts easy, runs smooth when cold, good throttle response and pulls well. Until you get about 7 or 8 miles down the road. At first just a few sputters and misses, couple of pops and backfire. If I turn around when it starts doing this I am limping back in a much lower gear before I get home. It won't pull over 2K rpm once it starts cutting out. The warmer it gets, the worse the missing is. I went to O'Reilly's and bought a throttle position sensor and changed it out. Didn't help at all. Repeat of the same thing. Runs good until it warms up then starts missing. I'm convinced it has to be electrical and interfering with firing but what do I know??? Ha. So I've changed spark plugs, distributor cap and rotor button, and now TPS. I guess next I'll change the coil out. Well, I am learning again after not wrenching on too much for many years. Noticed that it had no thermostat...don't know why. Like I say, have only had it a few days and no history is known to me. It looks as if most all of the original pollution control stuff is still in place. Mass air sensor voltage checked while running and it seems in normal range. The crank position sensor has been changed in the past (by its appearance) but these usually work, or don't work at all...correct? Ideas appreciated, TIA [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Engine cutting out after warm up
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