Question about 2002 Jeep Grand Cherokee

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2.7 crd.grand cherokee 2002. Varying idling speed,dimmng lights

It is a 2.7 crd. When the engine is idling, the idling speed keeps increasing and decreasing at the same pace all the time. It is much worse when I am using the headlights which keep dimming down and coming back up to normal with the varying idle speed of the engine. Your views
please. The battery is fine and the alternator is charging properly. A friend told me it may be the air con.The engine almost stalls at idling speed when I am using the headlights.

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Well it could be the idle control valve or vacuum leak check all vacuum lines for cracks and listen for air sound you may need to check PVC valve

Posted on Feb 08, 2010

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The engine in my 1994 jeep grand cherokee 4.0 idles very low (below 400 r.p.m's) when it sits still, Can I idle it up....how??


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Aug 18, 2010 | 1994 Jeep Grand Cherokee

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I have a problem with my grand cherokee laredo v8 1998 the problem is when its on idle it idle perfect buth sudenley the pump star making a noise and the noise goose high the fuel preshure drops and the...


ok, 2 things are happening, the most obvious is that you are low on fuel the pump spins faster, becauase there is no fuel to pressurise the lines

secondly, and more likely the fuel pump is failing, it is called cavitation. the pump pressurises the lines and there is enough fuel to keep the engine alive at idle, or at 5,000 revs. however, if the pump is failing it is only pumping enough to keep it at idle, and not enough to keep up with the demand of higher engine speeds.

soon enough, the pump will fail altogether, and and the engine will not start

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My oil pressure is dropping and at the same time my car is idleing to where it seems like my fuel pump is dying. Are the 2 related. If I step on the gas the oil pressure picks up and the my car gets gas...


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check for vacum leaks using a spray bottle of water  when the idle frops you found it  if water wont work try starting fluid or carb cleaner  if useing these the idle may increase  when you find it  replace/repair the hose and see if its still happending  could also be a combination of things  idle speed control motor idle air control motor  mass air flow sensor  good luck    

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A faulty gas cap can cause the sensor to come on.
Clean out the throttle body with a cleaner and see if the idle improves.

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