Whats wrong with my Idling?
#1
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Join Date: Aug 2009
Location: CA
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Whats wrong with my Idling?
Hello,
I have a 93 SC300 and I just had the engine rebuilt. Basically overhauled the car. But now when I start my car in the morning it is perfectly fine until 5 minutes later. The idle starts going up and down then after another 5 minutes it goes back to normal. There was a day when my car just did not start til I messed with the intake and the mass air flow sensor. I took it to a place and was told it was the sensor so I replaced the sensor today but the problem is still there. If anyone knows what is wrong with my car please let me know. Thanks!
I have a 93 SC300 and I just had the engine rebuilt. Basically overhauled the car. But now when I start my car in the morning it is perfectly fine until 5 minutes later. The idle starts going up and down then after another 5 minutes it goes back to normal. There was a day when my car just did not start til I messed with the intake and the mass air flow sensor. I took it to a place and was told it was the sensor so I replaced the sensor today but the problem is still there. If anyone knows what is wrong with my car please let me know. Thanks!
#4
Lexus Champion
iTrader: (8)
If it goes up above your normal idle speed, then drops down well below your typical idle speed, and repeats in that scenario than it's most likely your TPS. If it simply falls below your normal idle speed and never raises high, go low, high, go low, and gets dangerously low to the point of stalling, then it's probably your IACV.
Has your car ever thrown a CEL?
Has your car ever thrown a CEL?
#6
Lead Lap
iTrader: (1)
if its not throwing a cel, i would start with a little cleaning (cheapest possible fix) clean up the TB, and IACV, even possibly sea foam the car if you want, if that doesnt fix it then start going with parts like the tps,
one thing it might also, since you said the engine was rebuilt, who ever rebuilt it, did they tune your tps back to the correct spot? you can try adjusting the tps to level out the idling, it probably idles normal wen start because the engines not as hot, as it heats to running temp, the idle drops so when you adjust it youd be able to have run corrrect, just a thought
there is a DIY on here on how to check the tps for functionality so do that before you buy one, make sure its bad first
one thing it might also, since you said the engine was rebuilt, who ever rebuilt it, did they tune your tps back to the correct spot? you can try adjusting the tps to level out the idling, it probably idles normal wen start because the engines not as hot, as it heats to running temp, the idle drops so when you adjust it youd be able to have run corrrect, just a thought
there is a DIY on here on how to check the tps for functionality so do that before you buy one, make sure its bad first
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