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Jeep Grand Cherokee
#981 of 1240 Is it really the alternator????
Feb 24, 2012 (11:16 pm)
1999 Jeep Grand Cherokee Limited. About a month ago, I was driving and the gauge lights all came on, lights got dim, meter with battery symbol went to 9 and it died. Got out tightened negative cable and jumped it. It ran a month with battery gauge at 14. 3 nights ago same thing. Moved cables and jumped it, and made it home. got in last night, and battery meter gauge was at about 12, went about a mile and it was draining fast...went to 9. tried to jump, wouldn't start. today put new battery cable ends on, jumped it. It went to 14 on gauge, then 12, back to 14. Took to shop, he put it on machine. His machine read 12 and he said it was alternator. When he backed it out of the shop, mechanic was surprised it went back to 14 at the gauge. He wants us to have alternator rebuilt Monday and bring it to him to install. I can't afford to fix what may not be the issue. Does this sound like the problem to you????
#982 of 1240 Re: 01 Grand Cherokee tough start and no idle when cold [troubleshoot7]
Feb 25, 2012 (9:19 pm)
I have a 99 jeep and am having a problem with it aint shure what it is it had set in the shop for about 3 years bring it to the house it turns over very well but wont even try to start ive put gas in it and even tried starting fluid and it wont even try to start but turns over very well it acts like it aint getting any fire would anyone know what my problem could be?
#983 of 1240 Re: 01 Grand Cherokee tough start and no idle when cold [countryboy88]
Feb 26, 2012 (2:32 am)
Check the fire from the ignition coil. you can buy a spark tester for about 10 buck's at your local part's house. remember a yellow spark is the same as no spark on these jeep's. the spark must be blue . I have recurring issue's with mine only in hot weather. i purchased a coil with a unlimited lifetime warrenty. it cost a little more but they have replaced it 5 time's free.
I purchased a extra coil cause every time it would quit running i would have to call a tow truck. a 10 mm socket is all that's required to change it then i go trade the bad one for another new one. i'm not sure what cause's it unless it's the heat breaking it down. good luck. steve
#984 of 1240 94 JGC idle problem when warmed up after making several stops within 30 min
Mar 04, 2012 (9:19 am)
My friends 94 JGC 4.0L (170,000 Miles) will start up fine but then after temperature stablizes, while driving around town making several stops at various places within a 30 min time frame, she starts up the engine, it idles rough, kind of like it has a mis in several cylinders then will idle just fine after about one minute later. Kind of like smoothes out.
I can hear tapping noises coming from within the valve cover even when it is cold as well as hot and I asked her about this she said this has been going on since she bought the truck used.
The following sensors have been checked.
TPS, IAC, MAP, Intake temp sensor, OX sensor, Fuel rail pressure regulator, water temp sensor, new plugs...a light brown color on plugs...spark plug wires, rotor and cap.
The item replaced was the fuel rail pressure regulator which would allow the pressure to go up to 40 psi and not drop back down to 32-34 psi. After replacement, the fuel pressure stablizes around 34 psi with vacuum variations...No more 40 psi.
I did check the vacuum and during smooth idle, no needle fluctuations 14 inches but when rough idle lots of fluctuations until the engine smooths out. I'm thinking when engine starts up again, possible lack of oil within the lifters or lifter bleed off until oil pressure fills lifters? Oil is thinner.
I have not had the valve cover off as of yet and I hope the rockers have had oil during this period of time whereas if not , then there could be more possible problems.
I'm thinking about adding Gum Out oil treatment to hopefully free up any defective lifters.
Any ideas folks?
#985 of 1240 Re: 94 JGC idle problem when warmed up after making several stops within 30 min [lairbear]
Mar 04, 2012 (5:41 pm)
I have the same symptoms with my '98 JGC Limited 5.2 134K.
My mechanic suspects the CPS, (crank position sensor)
And many moons ago on my old '87 JGC 4.0L same thing. Your in luck, the CPS on the 4.0 is a lot easier to get to than on my 5.2. On yours it is on the bell housing, and can be reached from underneath jeep.
The v8 engines require the removal of the wires, cap, and heat shield on the passenger to reach it. And a star tip head on the bolts. Not fun for me.
'87 i had when I lived in FL, and when it went in the heat, it left me stranded. My current address here in up state NY this time of year with the cold weather has allowed me to get away with out having to change it so far, but when the weather gets warmer, I won't have a choice.
I am on call almost 24/7 so finding the time to do it my self is difficult and the look on the mechanics face, well on my Jeep it would be most likely 2 hrs or more to get to the two bolts and plug. So I will try and get it my self when I have no other choice. save my self $150 - $200 in labor.
#986 of 1240 problem's when warmed up after several stop's.
Mar 05, 2012 (3:07 am)
I had a similar issue with my jeep, the tapping noise you hear could be the fuel injecter's. take a long screwdriver and place the handle to your ear and place the other end on each fuel injecter. you should be able to hear very clearly whether it is the injecter's and not a oil issue. if you dont have the correct fuel pressure at the rail the injecter's will make noise . Also if you listen for the fuel pump to run and build up the pressure it will crank easier and may fix the rough idle. ( it did on my 93 with the 5.2 litre engine ) The injector's will sound just like a lifter or push rod knock. Also your fuer pressure regulator may be letting your fuel drain back into the tank after turning off the engine, another reason for listening for the fuel pump to do it's thing before cranking. the fuel pump should only have to run for about 5 second's and you should be able to hear it hum when you turn the ignition switch to the on position. another thing to try is marvel mystery oil. you can use it in the oil and gas however be very careful using fuel additive's because they can release dirt and contaminant's in your fuel system and that is a expensive fix. Is your jeep's check engine light coming on? if it is there's a easy way to retreave the engine code's. turn your key to the on and off position three time's and stop with it on the run position (do not start the engine) the check engine light should start flashing, just count the flashe's and when it flashes five time's then pause's and flashe's five more time's that is code 55 which mean's it has finished it's cycle. autozone or several website's can tell you what the flash / number's mean. have a good day, good luck. steve
#987 of 1240 Re: start an stall problems [96jeepgcl]
Mar 06, 2012 (4:26 am)
Just to let you all know its been almost a month now since I pulled apart pcm and reinstalled. I am happy to say that we have not had a problem since. I guess like a computer that has issues, you open it up and reseat stuff. Seems to have worked here.
Thanks and I wish you all good luck with your trouble shooting.
#988 of 1240 Endless problems! Help please lol.
Mar 12, 2012 (6:31 pm)
Ok so I bought a 96 jeep grand Cherokee Laredo last August.. It started bucking while driving and then dying. When it dies while driving, you can smell fuel. It isn't throwing any codes at all and I have replaced the fuel filter, pump, plugs n wires.. I have taken it to two mechanics but everytime I take it to get checked it runs perfect like it hates me. I recently had a friend check it out and he said that the cover to my pcm isn't there. idk if that has anything to do with it.. anyone else having these weird problems?
#989 of 1240 start problem driving me crazy
Mar 27, 2012 (7:20 pm)
hi, i have a 2001 jeep grand cherokee v6, 4.0, this happen to my twice,try to start my car after work and i didnt turn over. take the battery to autozone and they said its fine. next morning my car start right away. i don't know what it could be , any ideas?
#990 of 1240 Re: start an stall problems [96jeepgcl]
Apr 01, 2012 (4:27 am)
my 04 cherokee is idleing really high and even higher in park neutral and reverse and when im stoping it jerks the gas lights on i went to autozone and did thr trouble suprot code and it said p1294 do you have any ideah what it could be and i put the bosch platnum plugs in and now the gas mileage will rise and drop lowes to 8mpg and highest at 13