Random hesitation issues - highway speeds/idling
Long story short - 1997 Cherokee Sport. 150,000 miles. Since summer there have been intermittent hesitation problems. The entire charging system including battery has tested good. From time to time it will hesitate and cut out at highway speeds. Also, if it hesitates at idle at a stop light putting it in park seems to cure it. Check engine light comes and goes off just as fast. Can't pull a code because it does not stay on long enough. Am I looking at a fuel issue - clogged filter, bad gas, etc? Never had anything like this before. We thought it might have something to do with hot weather but it is 33 degrees here this morning. Any ideas? TIA.
Originally Posted by XJIceQueen98 View Post
Originally Posted by micifus
A flakey CPS can cause things like that. For a short spell I could only drive in reverse--put it in drive and it would stall. Sometimes it would hesitate, then run OK. Now it's fine. Weird. They are known to fail quite regularly. There is a test procedure--voltage check. You can search or someone may chime it. There are other things that can cause hesitation as well, obviously.
'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.
I had this issue with a bad O2. Would just lose power for a second then come back. Most likely the O2 on mine was just slow to react which happens with age. $60 part and if it has not been changed in years then it is most likely the problem. They are normally only good for about 60,000 miles.
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