1990 supra n/a idle problems

cre · 02-23-2010, 05:38 PM

Start with checking for error codes:
http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx

As it may not have been cleared in some time there may exist error codes which are for conditions which are no longer present; So, check it, write them all down, reset the ECU by pulling the EFI fuse (in the engine bay fuse box by the battery) for a few seconds.... Then drive it for a little while and recheck the codes and write them down. Post both sets back here.

I'd also check the TPS alignment. It has a switch inside which is used by the ECU to determine when the throttle plate is closed.

http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=101

02-23-2010, 05:38 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Start with checking for error codes: http://www.cygnusx1.net/Supra/TechTi...ror_codes.aspx As it may not have been cleared in some time there may exist error codes which are for conditions which are no longer present; So, check it, write them all down, reset the ECU by pulling the EFI fuse (in the engine bay fuse box by the battery) for a few seconds.... Then drive it for a little while and recheck the codes and write them down. Post both sets back here. I'd also check the TPS alignment. It has a switch inside which is used by the ECU to determine when the throttle plate is closed. http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=101 __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->