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Hard to start/revs by itself/whitish blue smoke
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tulsa442
Novice
Jul 23, 2010, 5:56 AM
Post #1 of 8
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Hard to start/revs by itself/whitish blue smoke
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I have a 2002 Jeep Grand Cherokee 4.7HO w/ 114k. It has a few problems I will list seperately in case they are not related.
When I start it, it cranks for a moment like its not getting enough fuel, then sputters before it starts. When it does it revs up to about 2200.
When its idling, it will start reving on its own. I have also noticed RPM change while driving steady and flat.
It also smokes sometimes. The smoke is white, maybe a little blue. It starts smoking when the idle starts going crazy.
There are no trouble codes. I tested the IAC valve and it's fine. I tried back probing the MAP sensor and am getting very low voltage .1v or .2v. Could this be it? What other sensors could I check? Would an O2 or temp sensor cause this?
Thanks!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 23, 2010, 7:58 AM
Post #2 of 8
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Re: Hard to start/revs by itself/whitish blue smoke
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Have you had to add any coolant or has it overheated recently?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tulsa442
Novice
Jul 23, 2010, 8:11 AM
Post #3 of 8
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Re: Hard to start/revs by itself/whitish blue smoke
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Not a drop. Just checked it again and still completely full. The temp doesn't get any hotter than 210, I guess that's what thermostat it has in it.
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Hammer Time
Ultimate Carjunky
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Jul 23, 2010, 8:50 AM
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Re: Hard to start/revs by itself/whitish blue smoke
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Has the check engine light come on at all?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tulsa442
Novice
Jul 23, 2010, 9:04 AM
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Re: Hard to start/revs by itself/whitish blue smoke
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No, no check engne light at all. I had it scanned just in case and didn't get any codes.
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Hammer Time
Ultimate Carjunky
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Jul 23, 2010, 9:10 AM
Post #6 of 8
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Re: Hard to start/revs by itself/whitish blue smoke
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That's strange. With what your describing the computer should be picking up on that stuff. Check it over for any vacuum leaks and then check the fuel pressure while your trying to start it so you can see what the fuel pressure does during this problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
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Jul 26, 2010, 5:45 PM
Post #7 of 8
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Re: Hard to start/revs by itself/whitish blue smoke
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tulsa; Another thought....Check the oil...does it smell like gas?
Loren
SW Washington
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tulsa442
Novice
Jul 26, 2010, 6:26 PM
Post #8 of 8
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Re: Hard to start/revs by itself/whitish blue smoke
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Just checked it. No gas smell
I did a flash reset on the computer and it was better for a little bit, but then the wierd idle and smoke comes back sometimes.
(This post was edited by tulsa442 on Jul 26, 2010, 6:33 PM)
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