Question about 2002 Jeep Grand Cherokee

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High idle lost comunication with you

Something happened here where are you?

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I wil assist you through e-mail due to the fact that someone else may get the chat if you try again. have you tried replacing the ecm?

Posted on Aug 15, 2008

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2 Answers

Idles high in park or neutral what could be the problem?


The idling must be adjusted manually. When does this started? Was it after a service? Does this happen all the time or just when the engine is hot?

Higher Idling isn't usually something too serious. It just mean at zero throttle (could be problem with your throttle pedal too), the engine is getting more air-fuel mixture than it used to. There's no way this can be resolved via online. You need to consult the mechanic, I'm sure its small problem that can be resolved in a couple of minutes.

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1997. Idle seems a bit high. How can I adjust it? I'm getting awesomely high mileage both city and highway but i think it could improve still more and the idling speed feels too high.


The idle speed is controlled by the engine computer through the idle air control valve , there are no provisions for adjusting idle . If idle is to high or you just think it's high , you need to test ,don't guess . Watch this video that shows what happens when you adjust thing's that you should not . Ford IAC valve test how to adjust minimum idle speed How to do it correctly !

Jan 16, 2016 | Mercury Sable Cars & Trucks

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Rough idle but car runs fine


If its a simple rough idle consider a few things given you have a Subaru. Your basic spark plugs and even coils at this point with mileage. Goods foundation for well taken care of high mileage cars. The engine has proven its self, just keep taking care of it.

Another thing to check if you do this and its still acting up is Subaru has issues with coolant getting corrosive and "eating" away at the head gaskets. If this is an issue you will have noticed a bit of coolant being lost. Check the spark plugs for coolant contamination Via google images or something. They get very clean because in a sense an internal leak does a kind of steam cleaning in a very distinct way.

Next would be check for an external leak which should not cause rough idle, but low coolant and over heating is easy with your engine design. Air pockets are too easy to get on your design. Do what is needed to keep coolant sealed and air pocket free.

Rough idle should also check vacuum hoses for cracks with high mileage. Rubber cracks and gets weak over this amount of time exposed to high heat of an engine. It just happens, its a rubber product. Silicone hoses are the best if you can get a hold of them. Pricey, but well worth it if you plan on keeping this or any car you plan on keeping to go this long.

Anything else would need more testing that would require different tools and diagnostic evidence to go further.

Good Luck

Jun 03, 2014 | 2003 Subaru Impreza

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1999 Land Rover Scaner Canot comunicate with vehcle


This can be cuased by dirty oil and or a worn cat converter as well as weak O2 sensor signals that switch to slowly.

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High idle car lunges forward


If you have a high idle and lunging...that usually happens when there is a leak on the intake manifold side allowing more air to get in, then the computer senses the increase in air and adds more fuel. There in turn has to be one more failure in the system to allow the idle to run away, may be a tps sensor (throttle position sensor) or something down the line.

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New Subaru, idles up and down (high/low) during cold startup


this is down to the idle control valve or the sensors on the exhaust being faulty.
please rat this advce.

Sep 04, 2008 | 2008 Subaru Outback

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Runing high rpm while in idle


First check for a loose hose or a vacuum leak. If you do not find a leak most likely the throttle position sensor is stuck and causing the truck to idle high. The throttle position sensor sticks, and if this happens you will need to replace it.

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1 Answer

1999 Taurus. A/C issues


ok firstible who recharge the system? you or an autorepair? or are you a mechanic? if you say the pressures are ok, what are the pressures at? and sound to me like the system is overcharge, please answer my questions so we can comunicate better, are you just a car onwer, or are you a mechanic because i see on you ranking than you have it high, that way we will comunicate better,

Jun 12, 2008 | 1999 Ford Taurus

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