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Old 04-10-2016, 06:53 PM
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johnny ray is on a distinguished road
1999 Grand Cherokee

Hello Jeepsters Having issues that I can not figure out cold start rough idle I've changed cam sensor timing off 20degrees fixed changed crank sensor,spark plugs, coil rail, fuel filter still wants to die and will any suggestions please help Jeep Jeepin ON

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Old 04-10-2016, 09:00 PM
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Re: 1999 Grand Cherokee

Have you checked your idle air control (IAC) sensor. Sounds like you've covered a lot already, check for fuel at rail? Good luck, I've found a lot of good information on this forum. Frango especially helpful
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Old 04-10-2016, 09:21 PM
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No not yet thank you just went and bought throttle pos sensor gonna change tomorrow did check fuel pressure 44psi that's what it's suppose to be according to this jeep book 1993 to 2004 so good with that thanks man we'll see what happens..
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Old 04-10-2016, 10:07 PM
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Re: 1999 Grand Cherokee

Another post guy had similar problem turned out to be temperature sensor bad, but can't remember why that tied into it, something about computer reading wrong temp, causing it to run too lean. Sean
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Old 04-11-2016, 08:43 PM
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Re: 1999 Grand Cherokee

Hey there Jeepters sandkwagers thank you changed throttle and iac sensor so far so good took on highway rough shift in 4 I believe then it was all good first throttle pos sensor I got was no good had it idling at 1500 after it was warm man I pray this was it Jeepin on thank you much keep you posted Johnny Ray
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