dead cylinder miss

Rob1 · 06-15-2011, 01:59 AM

89 supra turbo with T61 turbo upgrade, 550cc injectors, 3 inch turbo back exhaust, Apexi SAFC, just fully rebuilt it, rod and main bearings, pistons rings, the works, i think it needs a TPS, so that could be causing the probelm im having. It has a dead miss on cylinder 6. I replaced all the plugs with the rebuild but i didnt change the plug wires and the coilpack is the same one that was on it before so either one of those could be causing it as well i guess, any other suggestions??

El Supracabras · 06-15-2011, 02:57 AM

The TPS shouldn't cause a "dead" miss on just one single cylinder and cylinder 1 would also misfire if that coil was bad. Test for a good spark on both cylinders. Two other possibilities are: the injector, wiring or injector driver (inside ecu) to the misfiring cylinder failing or loss of compression in the cylinder. The wiring and ecu can easily be diagnosed using an ohmmeter and test lamp. The injector can be diagnosed by switching it with the injector next to it, if the misfire moves with the suspected injector, you have found a problem. Compression can easily be checked as well.
Sounds like it will be a fun car when it's healthy.

Rob1 · 06-15-2011, 04:40 AM

Thanks ill check out those options out it also misses during low rpm when i try to open up the throttle, and has trouble idleing so I think the tps could atleast be causing that irs throwi ng tps code

El Supracabras · 06-15-2011, 12:07 PM

Running on 5 cylinders will give it crappy acceleration and idle.
If you've taken the TPS out, it will need to be re calibrated. You may not need a new one, testing/calibrating procedures are in the tsrm.

06-15-2011, 01:59 AM	#1
Rob1 3" Exhaust Join Date: Aug 2009 Location: tennessee Posts: 137	dead cylinder miss 89 supra turbo with T61 turbo upgrade, 550cc injectors, 3 inch turbo back exhaust, Apexi SAFC, just fully rebuilt it, rod and main bearings, pistons rings, the works, i think it needs a TPS, so that could be causing the probelm im having. It has a dead miss on cylinder 6. I replaced all the plugs with the rebuild but i didnt change the plug wires and the coilpack is the same one that was on it before so either one of those could be causing it as well i guess, any other suggestions?? __________________ My work in progress!!! 1989 toyota supra turbo targa top 7mgte, Five speed left hand drive.

06-15-2011, 04:40 AM	#3
Rob1 3" Exhaust Join Date: Aug 2009 Location: tennessee Posts: 137	Thanks ill check out those options out it also misses during low rpm when i try to open up the throttle, and has trouble idleing so I think the tps could atleast be causing that irs throwi ng tps code __________________ My work in progress!!! 1989 toyota supra turbo targa top 7mgte, Five speed left hand drive.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
89 supra turbo last cylinder filled with oil??	89supra1990	MKIII Supra	4	01-14-2011 06:58 AM
Master Cylinder Leak	907mge	MKIII Supra	1	04-20-2010 03:03 AM
Clutch Master Cylinder question. 1989 Supra.	PFlanagan	MKIII Supra	4	08-07-2008 08:20 PM
Maintenance brake and clutch master cylinder fluid	IHateHacks	MKIII Supra	1	04-18-2007 07:15 PM
# 5 cylinder DEAD!???	Caliturbo88	Non-Generation Specific Questions	4	01-31-2007 03:49 AM

06-15-2011, 02:57 AM	#2
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	The TPS shouldn't cause a "dead" miss on just one single cylinder and cylinder 1 would also misfire if that coil was bad. Test for a good spark on both cylinders. Two other possibilities are: the injector, wiring or injector driver (inside ecu) to the misfiring cylinder failing or loss of compression in the cylinder. The wiring and ecu can easily be diagnosed using an ohmmeter and test lamp. The injector can be diagnosed by switching it with the injector next to it, if the misfire moves with the suspected injector, you have found a problem. Compression can easily be checked as well. Sounds like it will be a fun car when it's healthy.

06-15-2011, 12:07 PM	#4
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	Running on 5 cylinders will give it crappy acceleration and idle. If you've taken the TPS out, it will need to be re calibrated. You may not need a new one, testing/calibrating procedures are in the tsrm.