Idle Surging up/down
#1
Driver School Candidate
Thread Starter
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After hours of diagnosing, I hit a dead end. On my 93 SC400 i've I've been experiencing high idle issues. I've since removed the IAC for inspection and reinstalled -- and was fine. I then checked the TPS and sub sensor by removing and replacing with a known good. I also removed / reinstalled the throttle body and and intake also inspected vacuum lines.Now when I go to start the car to set the TPS setting the idle surges up and down violently.
I'm banging my head against the wall at this point. Any help you guys and give, would be appreciated.
I'm banging my head against the wall at this point. Any help you guys and give, would be appreciated.
#3
Driver School Candidate
Thread Starter
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Thank you for responding. Funny, this small journey all started with the IACV. I removed and cleaned (wasn't dirty at all). I replaced and still had the high idle issues, so I moved on to the TPS and sub-sensor, I now get the surging up and down. Think it still the IACV? Again it never did this until i removed the TPS and sub-sensor.
#4
Lexus Champion
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Thank you for responding. Funny, this small journey all started with the IACV. I removed and cleaned (wasn't dirty at all). I replaced and still had the high idle issues, so I moved on to the TPS and sub-sensor, I now get the surging up and down. Think it still the IACV? Again it never did this until i removed the TPS and sub-sensor.
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