engine troubles

yota_head · 02-20-2007, 08:40 PM

i have an 88 NA supra. the problem i am having is that the #1 cylinder misfires once the engine is warmed up. the spark plug seems to be fouling, if i pull it out its wet. if i dry it off and put it back in, it will run normal until it gets wet again. i replaced the spark plugs and air filter, and cleaned and inspected the cap rotor vacuum lines and plug wires, and they are not the cause. i also did a diagnostic, no codes are being thrown.
anyone have any ideas what could be up with my engine? bad injector? worn rings? bhg?
another problem i am having which may or may not be related and seems to be common with these cars(i searched) is if the engine is hot, i turn the car off and come back to start it up later before its cooled down completely, it idles rough and wants to stall. if i hold the gas pedal down and turn it on, it will run bad for about 10 seconds then slowly stabilize and idle normal.
thanks for the help

mrnickleye · 02-21-2007, 03:46 AM

Start the engine, then shut it off after a few seconds. Pull the plug and smell it. Is it gas. Sounds like a fuel injector is stuck open (some).

We see this problem at the shop at least every 2 weeks. Sometimes you can remove them and clean them. A seal kit is about $30-36 for all six.

I strongly recommend using some strong fuel system cleaner in the gas tank.

http://www.toyota-supra.info/forums/...ead.php?t=4658

http://www.toyota-supra.info/forums/...ighlight=video

yota_head · 02-21-2007, 04:20 AM

i have already put a bottle of stp injector cleaner and a full tank of chevron gas in the car.
i did another diagnostic, and this time got a code 42 "vehicle speed sensor." im thinking this has nothing to do with my problem, and everything to do with the fact my speedometer stopped working because i accidently broke the cable replacing the heater core(not a fun job!)
what does the ecu need to know the vehicle speed for anyway? the misfire problem began before my speedo cable troubles.

SideWinderGX · 02-21-2007, 04:57 AM

TEMS. the ecu needs speed ranges to determine what level (soft, medium or stiff) the suspension will change to. if you go over 65 mph, it will bump it up a level, then back below 55, itll bump it back down. probably other stuff too though.

yota_head · 02-21-2007, 05:58 AM

Quote:

Originally Posted by SideWinderGX

TEMS. the ecu needs speed ranges to determine what level (soft, medium or stiff) the suspension will change to. if you go over 65 mph, it will bump it up a level, then back below 55, itll bump it back down. probably other stuff too though.

i dont have TEMS which i found strange. my car has lsd and all the other fancy stuff including those headlight washer thingers that came with the sports package, but no tems.

02-21-2007, 03:46 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Start the engine, then shut it off after a few seconds. Pull the plug and smell it. Is it gas. Sounds like a fuel injector is stuck open (some). We see this problem at the shop at least every 2 weeks. Sometimes you can remove them and clean them. A seal kit is about $30-36 for all six. I strongly recommend using some strong fuel system cleaner in the gas tank. http://www.toyota-supra.info/forums/...ead.php?t=4658 http://www.toyota-supra.info/forums/...ighlight=video __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08. Last edited by mrnickleye; 02-21-2007 at 03:56 AM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Engine Help!	born2drv	MKIII Supra	9	02-01-2011 08:14 PM
problem seperating engine from manual tranny	Gengus	MKIII Supra	7	01-29-2008 12:10 AM
Keeping Engine Cool	mrnickleye	Supra FAQ	0	06-04-2005 10:02 PM

02-20-2007, 08:40 PM	#1
yota_head Stock Join Date: Feb 2007 Location: BC Posts: 12	engine troubles i have an 88 NA supra. the problem i am having is that the #1 cylinder misfires once the engine is warmed up. the spark plug seems to be fouling, if i pull it out its wet. if i dry it off and put it back in, it will run normal until it gets wet again. i replaced the spark plugs and air filter, and cleaned and inspected the cap rotor vacuum lines and plug wires, and they are not the cause. i also did a diagnostic, no codes are being thrown. anyone have any ideas what could be up with my engine? bad injector? worn rings? bhg? another problem i am having which may or may not be related and seems to be common with these cars(i searched) is if the engine is hot, i turn the car off and come back to start it up later before its cooled down completely, it idles rough and wants to stall. if i hold the gas pedal down and turn it on, it will run bad for about 10 seconds then slowly stabilize and idle normal. thanks for the help Last edited by yota_head; 02-20-2007 at 08:43 PM.

02-21-2007, 04:20 AM	#3
yota_head Stock Join Date: Feb 2007 Location: BC Posts: 12	i have already put a bottle of stp injector cleaner and a full tank of chevron gas in the car. i did another diagnostic, and this time got a code 42 "vehicle speed sensor." im thinking this has nothing to do with my problem, and everything to do with the fact my speedometer stopped working because i accidently broke the cable replacing the heater core(not a fun job!) what does the ecu need to know the vehicle speed for anyway? the misfire problem began before my speedo cable troubles.

02-21-2007, 04:57 AM	#4
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	TEMS. the ecu needs speed ranges to determine what level (soft, medium or stiff) the suspension will change to. if you go over 65 mph, it will bump it up a level, then back below 55, itll bump it back down. probably other stuff too though.