need help with 7mgte idle problem

MAG.net · 09-03-2007, 09:59 PM

hi, ok so i have this idle problem, it fulxuates up and down with no gas applied. i was told by a friend that it could be a vaccum leak and another told me to check the iac. anybody else have an idea or had the same problem? pls help. thanks in advanced

supramacist · 09-03-2007, 10:05 PM

Vaccume leak is the first thing to check.
That's what it sounds like.

After that I'm thinking timing. It's hard to say without more detail.

carfanatic89 · 09-04-2007, 01:07 AM

I think a vacuum leak

MAG.net · 09-04-2007, 01:14 AM

Quote:

Originally Posted by carfanatic89

I think a vacuum leak

thanks man

cre · 09-06-2007, 06:10 AM

It really could be either the ISC (Idle Speed Controller) or a vacuum leak.... another possibility is the TPS IDL switch not closing properly.

To test for a vacuum you've got a couple options. What's probably the simplest is to grab a small propane torch, open the valve a little, but don't light it. Then you trace each of the vacuum lines with the torch. If you pass a leak you'll know it, the idle will shift a fair amount.

The TSRM has details on testing and calibrating the TPS (which is the second thing I'd try): http://www.cygnusx1.net/Supra/Librar...ction=FI&P=100

Then, I'd try testing the ISC per the TSRM and if it tests out fine, disassemble it completely (take your time and be careful with the parts) and clean it out thoroughly.
http://www.cygnusx1.net/Supra/Librar...ction=FI&P=106

09-03-2007, 09:59 PM	#1
MAG.net Stock Join Date: Sep 2007 Location: wichita kansas Posts: 3	need help with 7mgte idle problem hi, ok so i have this idle problem, it fulxuates up and down with no gas applied. i was told by a friend that it could be a vaccum leak and another told me to check the iac. anybody else have an idea or had the same problem? pls help. thanks in advanced

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Idle problem	tokis	MKIII Supra	2	06-29-2008 01:00 AM
Idle problem again.	redmaro	MKIII Supra	17	02-10-2007 07:42 AM
Idle problem 1988 Supra non turbo	jimwww	Non-Generation Specific Questions	3	01-24-2006 03:50 PM
Idle Problem. Please Help	panicos	MKIV Supra	18	01-01-2006 06:56 PM
HELP!!!! '87 Supra idle problem	Morpho	MKIII Supra	0	10-03-2005 02:40 PM

09-03-2007, 10:05 PM	#2
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Vaccume leak is the first thing to check. That's what it sounds like. After that I'm thinking timing. It's hard to say without more detail.

09-04-2007, 01:07 AM	#3
carfanatic89 3" Exhaust Join Date: Apr 2007 Location: Waco Posts: 164	I think a vacuum leak

09-06-2007, 06:10 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	It really could be either the ISC (Idle Speed Controller) or a vacuum leak.... another possibility is the TPS IDL switch not closing properly. To test for a vacuum you've got a couple options. What's probably the simplest is to grab a small propane torch, open the valve a little, but don't light it. Then you trace each of the vacuum lines with the torch. If you pass a leak you'll know it, the idle will shift a fair amount. The TSRM has details on testing and calibrating the TPS (which is the second thing I'd try): http://www.cygnusx1.net/Supra/Librar...ction=FI&P=100 Then, I'd try testing the ISC per the TSRM and if it tests out fine, disassemble it completely (take your time and be careful with the parts) and clean it out thoroughly. http://www.cygnusx1.net/Supra/Librar...ction=FI&P=106