Idle from hell

wurvan · 09-13-2009, 11:05 PM

Ok got the misfiring problem fixed, however the idle still is going crazy originally 700rpm starts at 1600 and jumps up and down between that and 2600rpm. Any help here as I am down to one c ar due to an accident and the supra is all i got now. It will drive but will overheat rapidly due to the extra rpm running like that. Can a bad TPS cause this issue or would it more likely be the Idle control Sensor? I forgot to plug in the tps last time i started it and it made no difference to the running of the engine when i did that, nto sure if it would though.

mikeoc1 · 09-14-2009, 02:32 AM

have you checked for any codes yet? Also Sometimes if an engine is starving of fuel or running real lean (getting way too much air) it will rpm surge. Maybe make sure all your intake accordian/ducting is sealed tight? But maybe I would start with the ISC.

http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=106

1990supraguy · 09-14-2009, 04:21 AM

I have had the same problem with my 94 toyota pickup. It would rev up and down when at idle. I asked my brother, which is a toyota mechanic, and he said that I was low on coolant. Maybe you are low on coolant, it would'nt hurt to check.

09-13-2009, 11:05 PM	#1
wurvan Stock Join Date: Jan 2007 Location: Arlington, TX Posts: 5	Idle From Hell Ok got the misfiring problem fixed, however the idle still is going crazy originally 700rpm starts at 1600 and jumps up and down between that and 2600rpm. Any help here as I am down to one c ar due to an accident and the supra is all i got now. It will drive but will overheat rapidly due to the extra rpm running like that. Can a bad TPS cause this issue or would it more likely be the Idle control Sensor? I forgot to plug in the tps last time i started it and it made no difference to the running of the engine when i did that, nto sure if it would though.

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09-14-2009, 02:32 AM	#2
mikeoc1 Stock Join Date: Jun 2009 Location: tn Posts: 20	have you checked for any codes yet? Also Sometimes if an engine is starving of fuel or running real lean (getting way too much air) it will rpm surge. Maybe make sure all your intake accordian/ducting is sealed tight? But maybe I would start with the ISC. http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=106

09-14-2009, 04:21 AM	#3
1990supraguy Stock Join Date: Aug 2009 Location: Tri-Cities Posts: 9	I have had the same problem with my 94 toyota pickup. It would rev up and down when at idle. I asked my brother, which is a toyota mechanic, and he said that I was low on coolant. Maybe you are low on coolant, it would'nt hurt to check.