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Jeep Comanche MJ (1985 - 1992) Jeep's Cherokee-based compact pickup technical forum.

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Old November 1st, 2019, 13:46
pyrohildy pyrohildy is offline
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Location: Yorba Linda ca
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Comanche starts, runs, sputters out

It'll start, and it'll run for a bit, but it dies shortly after firing up, whether left to idle or giving it throttle.

Anybody know why an '89 4cy would be doing that? It has fuel, new fuel pump, and it ran fine for better than a half hour a week ago, and good for a couple minutes at a time two days ago, and nothing this morning.
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Old November 1st, 2019, 15:23
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smokeyyank smokeyyank is offline
Join Date: Jul 2014
Location: Gypsum, Crawlarado
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Re: Comanche starts, runs, sputters out

is a good starting point.

If you haven't yet get on comancheclub
88 MJ, 4.0, 4wd, 3 pedals, Shortbed.
Mods; ACOS, quick discos, HD tie rod and a bitchin air fresher
04 WJ, 4.7HO
Mods; 3" IRO lift, ADDCO rear sway bar, 4.7HO with bored fastman TB, AFE intake and Superchip tuner, 32s, lunchbox rear 242HD, 3" Kolak exhaust
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Old November 1st, 2019, 16:03
00rottweiler00 00rottweiler00 is offline
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Location: Delaware county, Pennsylvania
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Comanche starts, runs, sputters out

I dont have any experience with the 4 cylinder jeeps, do the 4 cylinders have a CPS like the i6s do? If so, that sounds exactly like a failed crank position sensor to me and probably worth checking out

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Old December 3rd, 2019, 22:44
tm8chris tm8chris is offline
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Location: GA
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Re: Comanche starts, runs, sputters out

Check the crank position sensor, TPS and CTS.
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