MARK3 ,sometimes hard to start, idle rpm not stable.

cre · 02-11-2010, 01:47 AM

You MUST insert a jumper across T(E)1 and E1 in the diagnostic box when setting/checking the timing. Additionally, NO CODES can be present, the throttle MUST be fully closed and the A/C MUST be off... and the engine needs to be at normal operating temp. The timing is supposed to be at 10 degrees BTDC, the ECU will advance it further based on sensor feed back, it's not an old Chevy, advancing it further yourself will actually do NOTHING.

Here's the process from the Toyota Service and Repair Manual:
http://www.cygnusx1.net/Supra/Librar...aspx?S=IG&P=20

And yes, from a cold start the car will usually be quite rich... it runs richer on purpose.

02-11-2010, 01:47 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	You MUST insert a jumper across T(E)1 and E1 in the diagnostic box when setting/checking the timing. Additionally, NO CODES can be present, the throttle MUST be fully closed and the A/C MUST be off... and the engine needs to be at normal operating temp. The timing is supposed to be at 10 degrees BTDC, the ECU will advance it further based on sensor feed back, it's not an old Chevy, advancing it further yourself will actually do NOTHING. Here's the process from the Toyota Service and Repair Manual: http://www.cygnusx1.net/Supra/Librar...aspx?S=IG&P=20 And yes, from a cold start the car will usually be quite rich... it runs richer on purpose. __________________ 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 --->