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Unread 05-19-2010, 03:35 PM   #1
reckfield
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Join Date: Apr 2010
Location: Chino Valley, AZ
Posts: 9
Engine Control Unit (ECU)

Where is the ECU located on a 90 Wrangler 2.5L? How difficult is it to remove? Is this something that Autozone or another parts store can test? Thanks for your help.

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Unread 05-19-2010, 04:53 PM   #2
Mark05059
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1989 YJ Wrangler 
 
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Location: quechee Vermont
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it is located behind the glove compartment. Not too hard to remove. A few screws and I believe 4 nuts for the grab handle. I dont know for sure if autozone or another parts store can test.
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Unread 05-20-2010, 06:20 AM   #3
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
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Whats going on? Whats the problem?
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Unread 05-20-2010, 09:50 AM   #4
Que89YJ
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1989 YJ Wrangler 
 
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When I first got the Jeep, I had problems with it idling correctly. It had sat for awhile. I first replaced plugs, wires, distributor cap, rotor and coil. Still had problems. Then I replaced the idle air control valve and helped alot. When I would shut off the engine, the IAC would then open the throttle body. So, when starting it would act normally, stating at about 2 grand and then falling down to just below 1000. Now, it does not do that anymore, except occasionally. I have no idea why. Thus, I am guessing the problem could be in the ignition control module or the ECU. I can have the ICM tested at Autozone. If that is okay, then I'm guessing the issue is the ECU. It starts up and runs okay besides the issue mentioned above with the IAC. But, somedays it will idle way down at 500 and die and other days it will idle at about 800 but will fall down to 500 or less and then pick backup to 800 or so about three times, then be fine. Strange

Ok, this is the post you sent. When you replaced the Iac did you also clean the the throttle body and IAC passages? High idle is usually an indication of a vacuum leak. Check for vacuum leaks and remember that you have vauum lines running to your axle and you heater controller in the insrument panel.
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Unread 05-20-2010, 11:52 AM   #5
Que89YJ
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I think you need to get a meter and measure the temp sensor and the throttle position sensor. I think one of them is bad.
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Unread 05-20-2010, 12:54 PM   #6
reckfield
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I don't have a clue as to how to test them. Any suggestions? If not, off to the dealer, yuck!
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Unread 05-20-2010, 01:29 PM   #7
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Idle issues usually are related to IAC and throttle position sensor. If you can get a meter the people on the forum here can walk you through testing it, there are 2 or 3 sensors that are possibly related to it so you can start with the obvious and with the cost of the dealership replace all 3 and still save $$$ or take it to the shop. If you replaced the IAC it sounds like you have the apptitude to figure out whats going on with a little coaching from the forum.
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Unread 05-20-2010, 04:02 PM   #8
reckfield
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Thanks

Thank you for all your help!!!!!!
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