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SUVs Jeep Cherokee and Jeep Grand Cherokee Jeep Cherokee Start Stall Idle Problems
180 messages, Last post on Nov 18, 2009 at 5:07 PM
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1990 Jeep Cherokee: Takes up to 30 seconds of cranking to start. Once started, will idle a little rough but straightens out with some revs. Has been hard to start for a while but recently degraded to the point of no road time. Put it in gear and it immediately runs rough, begins to backfire, won't take load. When put back into Park/Neutral it straightens out. Replaced fuel filter, TPS needed slight adjustment and I ran a bypass ground from the TPS as the ground was a little weak (runs a little better after that) and checked for vacuum leaks. Also verified the engine->firewall ground is ok. CPS generates .2 to .3 VAC when cranking (as per testing on lunghd's website). I have a new CPS and ready to replace it as it seems to be the common culprit in many posts that I've read. Anything else I should look for while I'm at it?
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Replying to: magicmaster (Jul 14, 2008 7:40 pm)
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Hi, I was hoping someone might be able to help. Hopefully, I can phrase my problem correctly.... I have a 2000 Cherokee Sport 4.0 auto. It has 98000 miles on it, I bought it new and kept up all the maintenance. About two weeks ago, it started giving me problems with hot start after a really hot day driving with the A/C on. It started fine cold. When hot, I had to really give it gas to get it to start and not immediately stall out. After a few minutes, the idle leveled out and all was well. A week later, the condition reversed. Hot starts were easy; one crank and good, no rough idle. Cold starts became troublesome, long crank, rev the engine until it levels out, all is well. Unfortunately, the cranks are wearing down the battery and the problem is one my local mechanic can't nail down. His only comment was the battery seemed drained-- 11 volts (no wonder with all the cranking). I plan on replacing it as it's four years old already and probably won't cut it for a New England winter, but I'm skeptical that it's the problem. Any thoughts? TPS? CPS? Coolant sensor? Plugs are three months old, Champion truck. I have the Haynes manual and I was planning on checking voltage resistance on each sensor. BTW, I checked the forum already and saw the bit about priming the fuel pump by switching it on and off twice. It seems to make no difference. Any and all suggestions would be great. Thanks in advance. --John
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Replying to: jkratman (Aug 05, 2008 1:10 pm)
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I own a 98 jeep grand cherokee laredo 4x4 straight 6 cylinder, my problem is i started it one night drove for about 30 yards I noticed my headlights went out first then the engine shut off. I thought this was weird so i tried starting it back up... it would not start nor did I have any headlights or horn or radio ... and i could'nt get my windows back up. I checked fuses I did not see any blown fuses. the real weird thing is that a jump will not help but the vehicle turns over, just wont start and no electric.... what could be my problem?
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Replying to: tuggajb (Aug 05, 2008 7:37 pm) 
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Replying to: johnnyb173 (Dec 21, 2006 5:17 am) |
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Replying to: magicmaster (Aug 01, 2008 7:14 am) TPS voltages check out across the sweep range? (A Digital volt meter might miss any dead spots -heck an analog might miss a dead spot too but an old school volt meter with a needle will catch a dead spot easier.)
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Replying to: harry44 (Aug 08, 2008 7:15 am) |
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