1990 Jeep YJ TBI 2.5 High Idle - Jeep Wrangler Forum
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Old 04-07-2014, 03:17 PM   #1
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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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Interesting fix, thanks for the info!

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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?
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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.
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