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Unread 02-08-2011, 05:14 AM   #1
RedChickadee
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Join Date: Oct 2010
Location: Pearl River
Posts: 4
Odd problem.

This will happen occasionally.... Moving along at highway speed and the engine will cut out for about five seconds and then come right back without me restarting it manually. Doesn't seem that the electrical system is effected because the headlights and radio and such continue to function normally. So far, i got nothing. Any theories?

Edit: it's a 1994 Cherokee.

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Unread 02-08-2011, 05:19 AM   #2
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,467
Crankshaft position sensor is a primary suspect here. They can become intermittent and provide you with the symptoms that you mention. It is probably the most common sensor failure on the Jeep 4.0

Read this thread.

http://www.jeepforum.com/forum/f11/c...ailing-639123/
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Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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Unread 02-08-2011, 07:36 AM   #3
RedChickadee
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Thanks for the info and the link. Looks like a little investigation with a multi tester is in order.
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Unread 02-08-2011, 08:13 AM   #4
mecompco
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1994 XJ Cherokee 
 
Join Date: Jul 2005
Location: Fairfield, Maine
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Quote:
Originally Posted by RedChickadee View Post
Thanks for the info and the link. Looks like a little investigation with a multi tester is in order.
The problem with this sort of intermittent failure is that the CPS is generally "good" but intermittently "bad". Of course, this makes it very difficult to test.

My '94 was doing exactly what you describe. The CPS still tests "good" with the MM but a replacement eliminated the stalling, so obviously it was "bad".

If the thing fails completely, (as the one in my '95 did), then it should, indeed, test "bad" with the MM.

Michael
__________________
'94 Cherokee Country
Engine: 4.0 HO, Sealed canister filter, 3 core CSF steel radiator, CatCo cat, Dynomax Turbo Flow muffler.
Electronics: Remote start/locks, Pioneer DEH-P7800MP w/XM, Polk Audio speakers, Garmin Nuvi 660 GPS, Cobra 148 GTL P&T w/Wilson 1000.
Suspension: Old Man Emu 3" lift+OME AAL, JKS adjustable trackbar, QDs, LCAs UCAs, A.C.O.S., DPG Offroad adjustable bumpstop plate, Daystar poly bumpstops.
Steering: Currie HD steering, C-ROK steering box reinforcement, OME stabilizer.
Armor/Recovery: T&T Custom belly skid, Mopar gas tank skid, JKS LCA mini skids, Rock Lizard Super Skink Sliders, Mopar 2" receiver, ARB Bull Bar/Ramsey REP 8.5 winch.
Drive train: D30 front axle w/Superior Chromo D30 axles & outter seals, D/S 4.56 R&P, ARB locker, Ruff Stuff cover. Ford 8.8 rear axle w/Superior Super 88 kit, Ford Motor Sports 4.56 R&P, ARB locker, SOLID cover, Russell stainless lines. Front and rear Tom Woods HD drive shafts, 242 x-fer case w/Tom Woods SYE.
Tires/Wheels: 33x10.5x15 BFG Mud Terrains on Alcoas.
Misc: Garvin Wilderness rack, Safari Snorkel, Redline Tuning hood lifts.
Awaiting installation: Autometer A pillar gauge pod, oil, water, & tranny temp guages, PIAA driving lights, Goferit tie-rod flip bushing, '95 Brake booster and M/C, M.O.R.E. Motor mounts, TnT Custom 1.5" Shackle.
Stroker Project: HO Block, '99 intake manifold, bored TB, 1" TB spacer, Dynomax Blackjack Header, Permacool electric fan.
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Unread 02-09-2011, 12:04 PM   #5
RedChickadee
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Quote:
Originally Posted by mecompco View Post
The problem with this sort of intermittent failure is that the CPS is generally "good" but intermittently "bad". Of course, this makes it very difficult to test.

My '94 was doing exactly what you describe. The CPS still tests "good" with the MM but a replacement eliminated the stalling, so obviously it was "bad".

If the thing fails completely, (as the one in my '95 did), then it should, indeed, test "bad" with the MM.

Michael
Well then, it looks like I'm replacing the CPS this weekend. Supposed to be decent weather, might as well get it done. Not like a new one would be the worst of things, and at the very least it would take it out of the equation. My other car is a 1986 BMW 325es... I'm used to equations. LOL
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Unread 03-12-2011, 04:13 PM   #6
RedChickadee
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Update: replaced the CPS and have driven locally and on the highway for a bit. Everything seems to be back to normal. Thanks for the heads up! Seems to have done the trick!
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Unread 03-12-2011, 04:18 PM   #7
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,467
Quote:
Originally Posted by RedChickadee View Post
Update: replaced the CPS and have driven locally and on the highway for a bit. Everything seems to be back to normal. Thanks for the heads up! Seems to have done the trick!
Another happy Jeep Forum ending. Glad we could help!

If you own an XJ with a 4.0 long enough, you WILL be replacing the crank sensor.

It's just a matter of "WHEN".
__________________
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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Unread 03-12-2011, 04:32 PM   #8
mecompco
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1994 XJ Cherokee 
 
Join Date: Jul 2005
Location: Fairfield, Maine
Posts: 4,253
Thanks for the update!

Michael
__________________
'94 Cherokee Country
Engine: 4.0 HO, Sealed canister filter, 3 core CSF steel radiator, CatCo cat, Dynomax Turbo Flow muffler.
Electronics: Remote start/locks, Pioneer DEH-P7800MP w/XM, Polk Audio speakers, Garmin Nuvi 660 GPS, Cobra 148 GTL P&T w/Wilson 1000.
Suspension: Old Man Emu 3" lift+OME AAL, JKS adjustable trackbar, QDs, LCAs UCAs, A.C.O.S., DPG Offroad adjustable bumpstop plate, Daystar poly bumpstops.
Steering: Currie HD steering, C-ROK steering box reinforcement, OME stabilizer.
Armor/Recovery: T&T Custom belly skid, Mopar gas tank skid, JKS LCA mini skids, Rock Lizard Super Skink Sliders, Mopar 2" receiver, ARB Bull Bar/Ramsey REP 8.5 winch.
Drive train: D30 front axle w/Superior Chromo D30 axles & outter seals, D/S 4.56 R&P, ARB locker, Ruff Stuff cover. Ford 8.8 rear axle w/Superior Super 88 kit, Ford Motor Sports 4.56 R&P, ARB locker, SOLID cover, Russell stainless lines. Front and rear Tom Woods HD drive shafts, 242 x-fer case w/Tom Woods SYE.
Tires/Wheels: 33x10.5x15 BFG Mud Terrains on Alcoas.
Misc: Garvin Wilderness rack, Safari Snorkel, Redline Tuning hood lifts.
Awaiting installation: Autometer A pillar gauge pod, oil, water, & tranny temp guages, PIAA driving lights, Goferit tie-rod flip bushing, '95 Brake booster and M/C, M.O.R.E. Motor mounts, TnT Custom 1.5" Shackle.
Stroker Project: HO Block, '99 intake manifold, bored TB, 1" TB spacer, Dynomax Blackjack Header, Permacool electric fan.
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