Idle problem again.

redmaro · 02-07-2007, 02:53 AM

Well just when I tought my idle problem was gone, the problem is back again. I did another diagnostic again and I got codes 22 and 52 which are the Coolant Temp sensor and the Knock Sensor. I replaced the temp sensor and I am still having the idle problem. But what I noticed is that when i disconnect the coolant temp sensor wiring connector, the car will drop the idle to normal working rpm's(600 rpms). I checked my coolant temp sensor wiring and it seems good. After I finished insalling the coolant temp sensor I did a diagnostic again and I only got code 52(knock sensor). Help?

IHateHacks · 02-07-2007, 02:57 AM

Did you replace it with a dealer sensor or autozone special?

Knock sensor has nothing to do with idle.

redmaro · 02-07-2007, 02:59 AM

The brand is WELLS and I got it from Auto Zone for $30.

IHateHacks · 02-07-2007, 03:06 AM

That, my friend is your problem. I recall a week or 2 ago someone had the exact same problem. It seems that aftermarket coolant temp sensors for the 87-92 supra are not the correct resistance. One reason for this is that they don't make an aftermarket sensor for a supra so the parts store computer substitutes it for one that will fit but it has the wrong resistance values. Trust me on this, I went through the same thing with an 89 Taurus SHO. I kept getting sensors that were made for Taurus LX's. They fit, but didn't work right.

I know dealer sensors are more money, and they will have to special order it but it's the only one that works.

redmaro · 02-07-2007, 03:20 AM

I guess I'll have to buy one from a toyota dealer. Ill post up what happend when I install the genuine toyota temp sensor. Thanks IHATEHACKS.

mrnickleye · 02-07-2007, 03:37 AM

Curious....what is the part # of the one you got from the zone??

02-07-2007, 02:53 AM	#1
redmaro walbro fp Join Date: Mar 2006 Location: arizona Posts: 432	Idle problem again. Well just when I tought my idle problem was gone, the problem is back again. I did another diagnostic again and I got codes 22 and 52 which are the Coolant Temp sensor and the Knock Sensor. I replaced the temp sensor and I am still having the idle problem. But what I noticed is that when i disconnect the coolant temp sensor wiring connector, the car will drop the idle to normal working rpm's(600 rpms). I checked my coolant temp sensor wiring and it seems good. After I finished insalling the coolant temp sensor I did a diagnostic again and I only got code 52(knock sensor). Help? __________________ MK3, Auto, Turbo.

02-07-2007, 02:59 AM	#3
redmaro walbro fp Join Date: Mar 2006 Location: arizona Posts: 432	The brand is WELLS and I got it from Auto Zone for $30. __________________ MK3, Auto, Turbo.

02-07-2007, 03:20 AM	#5
redmaro walbro fp Join Date: Mar 2006 Location: arizona Posts: 432	I guess I'll have to buy one from a toyota dealer. Ill post up what happend when I install the genuine toyota temp sensor. Thanks IHATEHACKS. __________________ MK3, Auto, Turbo.

02-07-2007, 03:37 AM	#6
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Curious....what is the part # of the one you got from the zone?? __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

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02-07-2007, 02:57 AM	#2
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Did you replace it with a dealer sensor or autozone special? Knock sensor has nothing to do with idle.

02-07-2007, 03:06 AM	#4
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	That, my friend is your problem. I recall a week or 2 ago someone had the exact same problem. It seems that aftermarket coolant temp sensors for the 87-92 supra are not the correct resistance. One reason for this is that they don't make an aftermarket sensor for a supra so the parts store computer substitutes it for one that will fit but it has the wrong resistance values. Trust me on this, I went through the same thing with an 89 Taurus SHO. I kept getting sensors that were made for Taurus LX's. They fit, but didn't work right. I know dealer sensors are more money, and they will have to special order it but it's the only one that works.