Idle problem

pedrobabone · 07-16-2008, 04:58 PM

Ok so i bought an 88 MR2 a couple of months ago for $450. It was running weird so i checked all the majors and found the injectors clogged. I cleaned the injectors and throttle body just for good luck. It runs great i can tell there is no problems with the engine. The only problem im having now is the idle. It with jump between 1500 and 2500rpm's. I went to the local toyota dealer for parts on my fx16 and talked to the guys about it. There i was told to check the cooling system. It was full of rust and dirt and grime. So i flushed it as best i could. At some point it would maintain an idle at 1500rpm's as soon as i rev it up it goes back to the iratic idle. I also replaced the mass air flow sensor with one from a fx16 cause the one on it looked like somone had been in it. I checked for vacum leaks cause the idle screw doesnt change anything when i adjust it. Im lost at what to do. I think if it keeps up im either going throught the entire cooling system to check it out or sell it but i want to drive it first.
Any help is much appreciated.
Thanx JB

F0Bman · 07-16-2008, 08:35 PM

Make sure that your coolant bypass hoses are correctly hooke dup on your throttle body.

dposer · 12-25-2008, 02:55 AM

check your tps setting that is probably your problem if your tps is mis adjusted it will cause idling problems, excessive fuel usage and a weird idle problem much like what you described

07-16-2008, 04:58 PM	#1 (permalink)
pedrobabone No Skills Join Date: Jul 2008 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Idle problem Ok so i bought an 88 MR2 a couple of months ago for $450. It was running weird so i checked all the majors and found the injectors clogged. I cleaned the injectors and throttle body just for good luck. It runs great i can tell there is no problems with the engine. The only problem im having now is the idle. It with jump between 1500 and 2500rpm's. I went to the local toyota dealer for parts on my fx16 and talked to the guys about it. There i was told to check the cooling system. It was full of rust and dirt and grime. So i flushed it as best i could. At some point it would maintain an idle at 1500rpm's as soon as i rev it up it goes back to the iratic idle. I also replaced the mass air flow sensor with one from a fx16 cause the one on it looked like somone had been in it. I checked for vacum leaks cause the idle screw doesnt change anything when i adjust it. Im lost at what to do. I think if it keeps up im either going throught the entire cooling system to check it out or sell it but i want to drive it first. Any help is much appreciated. Thanx JB

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07-16-2008, 08:35 PM	#2 (permalink)
F0Bman Cage Fighter Join Date: Mar 2008 Posts: 257 Thanks: 0 Thanked 3 Times in 3 Posts iTrader Rating: (0/0% )	Make sure that your coolant bypass hoses are correctly hooke dup on your throttle body.

12-25-2008, 02:55 AM	#3 (permalink)
dposer No Skills Join Date: Dec 2008 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	check your tps setting that is probably your problem if your tps is mis adjusted it will cause idling problems, excessive fuel usage and a weird idle problem much like what you described