Timing problem

f00g00 · 03-12-2006, 09:12 PM

Hi,
My 87 NA Supra has been sluggish for awhile now so I checked the timing and it looks like the ECU is not adjusting the timing automatically. I loosened the bolt and moved the distributor both ways and the rpm increased and decreased without shorting out the diagnostic plug. Anyone run into this problem before?, and if so what fixed it?

mrnickleye · 03-13-2006, 03:29 AM

You won't necessarily 'see' the timing move (looking at a timing light) while you rev the engine sitting there in neutral.

The computer looks at RPM, vehicle speed, load, throttle postion, engine temp., intake air temp, etc, etc,etc. Then it decides where to set the timing.

Just jump the terminals, set the timing to 10*-15*, remove the jumper, and drive it. I bet the timing is working correctly, as I have not seen one thread on several supra forums about timing not advancing properly.
(nor in the shop either).

f00g00 · 03-13-2006, 08:24 PM

I found an old copy from a toyota repair manual I had the toyota dealer here
burn for me that has the plugs for the ECU and read the wires for the distributor to the ECU and found an open circuit, further troubleshooting revealed the problem to be in the distributer itself. I am picking up a used one tomorrow and will install it and see if the problem is fixed.

03-12-2006, 09:12 PM	#1
f00g00 12psi boost Join Date: Aug 2005 Location: Kuwait Posts: 292	Timing problem Hi, My 87 NA Supra has been sluggish for awhile now so I checked the timing and it looks like the ECU is not adjusting the timing automatically. I loosened the bolt and moved the distributor both ways and the rpm increased and decreased without shorting out the diagnostic plug. Anyone run into this problem before?, and if so what fixed it?

03-13-2006, 03:29 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Probably works fine You won't necessarily 'see' the timing move (looking at a timing light) while you rev the engine sitting there in neutral. The computer looks at RPM, vehicle speed, load, throttle postion, engine temp., intake air temp, etc, etc,etc. Then it decides where to set the timing. Just jump the terminals, set the timing to 10-15, remove the jumper, and drive it. I bet the timing is working correctly, as I have not seen one thread on several supra forums about timing not advancing properly. (nor in the shop either). __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

03-13-2006, 08:24 PM	#3
f00g00 12psi boost Join Date: Aug 2005 Location: Kuwait Posts: 292	open circuit I found an old copy from a toyota repair manual I had the toyota dealer here burn for me that has the plugs for the ECU and read the wires for the distributor to the ECU and found an open circuit, further troubleshooting revealed the problem to be in the distributer itself. I am picking up a used one tomorrow and will install it and see if the problem is fixed.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ABS Problem?	rasclaat_98	MKIII Supra	6	12-13-2010 09:53 PM
speed sensor problem	nadircicek	Non-Generation Specific Questions	8	10-09-2009 05:58 PM
Timing problem	mc_p0pe	MKIII Supra	1	07-03-2008 06:36 PM
Can't adjust timing...	Lunch2000	MKIII Supra	7	11-26-2006 04:09 AM
timing issues	stuck1	MKIII Supra	0	03-27-2006 02:16 PM