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Unread 05-06-2014, 10:55 PM   #1
bmarotz
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Join Date: May 2014
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Helpp

need help my jeep idols really rough and dies sometimes at a stop or I'll have to keep my foot on the gas and brake at same time to keep it going to 2000 Jeep Cherokee sport four liter six-cylinder engine fuel pump? Injectors? PCM? Fuel filter?

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Unread 05-07-2014, 07:42 AM   #2
bmarotz
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Anyone got an opinion
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Unread 05-07-2014, 07:48 AM   #3
cruiser54
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1990 MJ Comanche 
 
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Try this:

Courtesy of TJWalker:
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The Idle Air Control (IAC) is mounted on the back of the throttle body. (front for 87-90) The valve controls the idle speed of the engine by controlling the amount of air flowing through the air control passage. It consists of a stepper motor that moves a pintle shaped plunger in and out of the air control passage. When the valve plunger is moved in, the air control passage flows more air which raises the idle speed. When the valve plunger is moved out, the air control passage flows less air which lowers the idle speed. Over time and miles, the IAC can get carboned up which can have an adverse affect on idle quality. Cleaning the IAC may restore proper function and is an easy procedure to perform and good preventive maintenance so it is never a bad idea.

CLEANING THE JEEP 4.0 IDLE AIR CONTROL

Remove the air filter cover, associated hoses and the rubber boot that goes from the air filter cover to the throttle body. Remove the IAC with a torx driver (2 bolts; one can be kind of hard to get to)

“Gently” wiggle out the IAC from the throttle body. Gasket on the IAC can be re-used if it is not damaged

Clean the IAC with a spray can of throttle body cleaner; inexpensive and available at any place that sells auto parts. Throttle body cleaner is recommended rather than carburetor cleaner as it is less harsh, safe for throttle body coatings and is best for this task. Use cleaner, a rag and a toothbrush and or Q-Tips. Be gentle; don’t twist or pull on the pintle that protrudes from the IAC as it is fragile and you could damage it.

Thoroughly spray clean and flush where the IAC seats in the throttle body with the same spray cleaner

It is also a good idea to clean the entire throttle body itself, the butterfly valve inside of the throttle body and all associated linkage as long as you have things disassembled



An FYI: Titling threads HELP almost always guarantees folks who could probably help you, will skip over the thread. counter productive way to title a thread. Fact.....
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 05-07-2014, 11:41 AM   #4
CJ7-Tim
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Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
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After you do all the stuff TJWalker recommends, if the problem continues, have the battery and alternator tested.
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Unread 05-08-2014, 12:36 PM   #5
bmarotz
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I tried all that even replaced the iacv after cleaning didn't work. New battery and alternator. I said screw it and bought a new head gasket set and cylinder head bolts. Last thing I can think if is maybe the head gasket cracked intern causing it to misfire. If this dot work idk. Could bad fuel injectors cause these symptoms?
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Unread 05-08-2014, 04:56 PM   #6
CJ7-Tim
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Location: out in the garage - Minneapolis, Minnesota
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Rather than opening the hood and throwing random new parts at an undiagnosed problem, you should do some research on the Interwebs and some testing/inspecting on your Cherokee.

Are ALL the tune-up parts fresh, including the coil ? Have you tested the fuel pressure ? Have you tested the fuel injectors ? Have you tested the O2 sensors and the Coolant Temperature Sensor ? If you think the head or head gasket is the cause, have you tested for failure ?
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Between 2009 when Obama took office, and 2013, median annual household incomes have fallen by more than $2,100.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ......

Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.
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Unread 05-09-2014, 11:25 AM   #7
Kalali
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Quote:
Originally Posted by bmarotz View Post
I tried all that even replaced the iacv after cleaning didn't work. New battery and alternator. I said screw it and bought a new head gasket set and cylinder head bolts. Last thing I can think if is maybe the head gasket cracked intern causing it to misfire. If this dot work idk. Could bad fuel injectors cause these symptoms?
That seems awfully drastic but go for it if you really enjoy replacing head gaskets just for giggles... There are a lot of things to be ruled out and a head gasket is definitely not one of them. Any engine codes?
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