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Tickover 1500 rpm when warm - Grand Cherokee Jeep Cars & Trucks

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  • Jeep Master
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Idles too fast.
what engine?
what year?

on a gas engine, the idle speed is 100% controlled by PCM at all times. hot.
so its out of control that means the PCM closes the ISC valve.
and RPM will not drop. (its stuck open) or vacuum air leaks
jeeps use speed density EFI system using the MAP sensor.
this means all air leaks on jeeps , cause wild fast idle speeds.
that is all you need to know , to find problem (find leaks)

clean the ISC yet (idle speed control) valve.?

Posted on Mar 29, 2015

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Posted on Jan 02, 2017

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What is the factory Idle rpm for 22re efi engine


I've seen from 500 to 1500 RPM in all the manuals I've been through, depending on the year and application (truck/car). In personal experience, 650-800 RPM is acceptable warm operation range. This will also depend on elevation. Will go up to 1200-1500 RPM for cold starting. I live at about 2000ft and my '86 Pickup 22RE idles at 725-750 like a top after about a 3-4 min warm up @ 1250 RPM if it's cold (<45ish).

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1978 Porsche 911SC Cold start with correct tick over of about 800 rpm. Almost immediately however rpm increases up to a tickover speed of about 2800 rpm. This rpm is sustained continuosly up to and...


hello there
can you check if your distributor advance plate is free of movent?
Or your vacuum hose for advance is working(the one on the right)Check your timming as well.it is 5 before tdc.
Check this out and get back to me with an email
Seems like your idle get stuck on high rmp right?
Let me know what do you mean tick over?
proporsche@yahoo.com

proporsche

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When the weather is cold, while driving normally, the RPM will just automatically goes up but when the weather is warm, the car has no problem. is there a thermostat or temperature gauge in the car?


Sounds like a faulty temp sensor,giving a false signal to the cold start fuel injector. Normally at start up this will be obvious in a higher tickover rpm than when in warm weather. If it is doing it when driving along then you temp sensor could well be faulty, or possibly the injector itself,a bit like a carburettor choke on an old car.

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1999 golf 1.6 sr engine tickover 600 jumps to around 900 back to 600 irrattic worse when cold but can do it when warm thx


sounds as if your mass air meter is badthis will cause the fluctuation in rpm it is located on the airfilter box

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Cold idle is right at 2k rpm.


could be a vacume leak. check hose for cracks or lose conections.

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1 Answer

High revs


being a fuel injected engine , there are many reasons this could be happening.
from the top , lets check the Manifold Absolute Pressure (M.A.P.) sensor , as it is easiest.
Find the MAP sensor , it has a couple a wires and a vacuum tube going to it and is on the firewall or fender support under the bonnet.
Disconnect the wire harness from it (small plug with wires).
If the engines RPMs drop to normal , replace the MAP sensor.

Aug 09, 2008 | 1991 Peugeot 405

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