1990 Jeep YJ TBI 2.5 High Idle - Jeep Wrangler Forum
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Old 04-07-2014, 03:17 PM   #1
MrWROLguy's Avatar
Join Date: Mar 2014
Location: Texas
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1990 Jeep YJ TBI 2.5 High Idle

I have just repaired my high idle on my Jeep.. I just wanted to share to help others with the same problem

After reading the service book.. I discovered the Idle on my jeep is controlled by the ECM via the IAC on the TPI...

The A.C unit / Power Steering Pump have control sensors that report back to the ECM due to load and change the Jeep Idle accordingly...

Well my problem being I don't have A.C is the power steering module reporting back to the ECM was under load all the time... Which inturn caused my idle to be very high... 2000 rpms. Well I have ordered a replacement but I swapped out my spark plugs for kicks and unplugged my power steering module reporting back to ECM.. and TADA the Jeep now idle's between 800 and 900 rpm's in closed loop.

Hope this helps someone.

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Old 04-08-2014, 07:39 PM   #2
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Location: Melbourne, FL
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Interesting fix, thanks for the info!

95' YJ 4-Banger, 5" black diamond lift, Bilstein shocks, shackle reversal kit front and revolvers rear, 33 x 12.5 BFG A/Ts, Dynatrac D60 Axles front and rear, ARB air lockers front and rear, custom drive shafts, 3/4 ton break calipers, 10k LB Engo syth winch, 50" LED windshield light bar, black Monstaliner inside, Predator Green Monstaliner outside, marine speaker sound system, marine vinyl dash and seats. Many other little goodies!
Swap to a 4BT diesel in the future? Most likely.
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Old 04-22-2014, 09:39 PM   #3
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Thanks for the 411. Did it idle high all the time or only when cold?
"The difference between my vehicle and your vehicle is that mine won a war."
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Old 04-23-2014, 06:19 AM   #4
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it idled around 2000-2500 all the time before unplugging power steering sensor.
A Jeep Factory Service Manual is your best friend.
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