Random high idle at startup
04-18-2017, 08:23 PM
#1
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Year: 1989
Model: Cherokee
Engine: 4.0L
Random high idle at startup
This issue is getting old... time to ask for help.
89 4.0 that will randomly idle up around 2000 rpm on startup.
Happened a while back, so I took the TB apart and cleaned it as well as the IAC. Seemed to help for a while... but now the issue has reared it's ugly head again.
TPS maybe? Any other ideas?
EDIT: Forgot about the TPS test and adjustment on cruiser's page. Going to start there first.
89 4.0 that will randomly idle up around 2000 rpm on startup.
Happened a while back, so I took the TB apart and cleaned it as well as the IAC. Seemed to help for a while... but now the issue has reared it's ugly head again.
TPS maybe? Any other ideas?
EDIT: Forgot about the TPS test and adjustment on cruiser's page. Going to start there first.
Last edited by Jimbo Slice; 04-18-2017 at 08:29 PM.
04-18-2017, 10:01 PM
#2
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
This issue is getting old... time to ask for help.
89 4.0 that will randomly idle up around 2000 rpm on startup.
Happened a while back, so I took the TB apart and cleaned it as well as the IAC. Seemed to help for a while... but now the issue has reared it's ugly head again.
TPS maybe? Any other ideas?
EDIT: Forgot about the TPS test and adjustment on cruiser's page. Going to start there first.
89 4.0 that will randomly idle up around 2000 rpm on startup.
Happened a while back, so I took the TB apart and cleaned it as well as the IAC. Seemed to help for a while... but now the issue has reared it's ugly head again.
TPS maybe? Any other ideas?
EDIT: Forgot about the TPS test and adjustment on cruiser's page. Going to start there first.
06-21-2017, 04:39 PM
#3
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Year: 1989
Model: Cherokee
Engine: 4.0L
Sorry it took so long to get back with this.
My high idle randomly disappeared for a month or so, and then began to rear it's ugly head once again.
So, I went straight to tip 5... everything checked out normal.
Then I did tip 8, crunched a couple numbers and clocked the tps until it hit my desired output voltage.
She starts like a dream. THANKS A TON CRUISER! Your Renix site has been an invaluable resource for me!
My high idle randomly disappeared for a month or so, and then began to rear it's ugly head once again.
So, I went straight to tip 5... everything checked out normal.
Then I did tip 8, crunched a couple numbers and clocked the tps until it hit my desired output voltage.
She starts like a dream. THANKS A TON CRUISER! Your Renix site has been an invaluable resource for me!
06-21-2017, 04:43 PM
#4
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Year: 1989
Model: Cherokee
Engine: 4.0L
P.S. My output voltage was well outside the 17% range required before the tune up.
So one last question... What causes them to get out of range and require adjustment? Obviously it was a known issue... I mean, they are slotted to allow for movement.
So one last question... What causes them to get out of range and require adjustment? Obviously it was a known issue... I mean, they are slotted to allow for movement.
06-21-2017, 05:33 PM
#7
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
