Question about 1985 Jeep Cherokee

1 Answer

Warning lights flashing on 2001 jeep, low idle rpm

The warning lights on the dash of my 2001 jeep wrangler 4.0 flash when it is at idle. When I give it gas they stop. The idle is below 500 rpm per the tach. Here's the weird part, when I drive it in the rain it doesn'tdo it. I re-grounded the battery and engine with heaver wire thinking it could be a ground problem, had the alternator checked, it was fine. Have undone all the elec. connectors cleaned them and put anti corr spray on them. Any ideas?

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  • fritzcrich Jun 16, 2009

    Yes I did re-ground the body and dash and motor and battery with heavier wire and sanded the area around the ground. I saw on another web site about the rpm sensor around the bell housing. It would be wet in the rain and controls the idle. I'm a marine electrican working on the mega boats, this is driving me crazy...Why the drop in rpm's and why when I give it gas the flashing stops? Talked to Massie Yardly the local Jeep dealer, told them the problem, the service writer said,"Geez, never heard of that before,"doesn't give me a warm and fuzzy feeling about taking it there for them to get an education at my expense... Thanks

  • Richard Scordino May 11, 2010

    Sounds a lot like a body or dash ground problem...did you check that?

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  • Jeep Master
  • 6,982 Answers

The sensor on the bellhousing is a crank position sensor...rpm is read from the ignition coil. It sounds like you have gone everywhere I would have gone, but, what if the flashing lights are the result of low charge rate from low idle (not the other way around)? Then you would be looking at an idle air control valve or something causing low idle condition.If the passageway is clogged up it could be lowering the idle speed. When it rains the air density changes, but It dosen't make a lot of sense. Map sensor is pressure sensitive but usually causes rough running if failed, manifold temp sensor could have something to do with it, but I've never seen one do that.
Just a couple of thoughts...can't offer more, but this is definitely one I'd have to be there for!

Posted on Jun 16, 2009

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On these issue,there are few solved help links for troubleshooting the issue easily.-------

Click the link below:---
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

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Car will not go into 4WD high or 4WD low?


http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

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No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

----------
2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

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Traction control switch will not engage on 4WD High or Low

http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

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4WD light flashing and 4WD will engage after few minutes

http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

------------
2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?

http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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4x4 front differential will not engage the axle on ford?

http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

-------
4x4 will not engage on Ford F150? http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

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Dodge Ram 4x4 light keeps flashing 4X4 LOW LIGHT IS FLASHING ON DASH

http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

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Ford 4x4 front wheels will not engage?

http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html

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Car will not go into 4WD high or 4WD low? http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

------------
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

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Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html

-----------
Car automatically switches to 4wd low?

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------------
Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html
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http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

---------------
4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high? http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
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