TPS or Knock Sensor?? - Page 2

kewlcoconut · 10-03-2005, 08:00 AM

OK I will try and clear this up a little more lol.

This problem of mine started not too long ago. I checked the diagnostics myself, and I thought I came up with TPS and knock sensor error codes. But then I took it to my mechanic, and they came up with only the knock sensor. So I misread the codes when I diagnosed it myself. And they replaced the sensor for me. Now my engine light is off. So it wasnt the TPS at all.

But I still have the same problem. The throttle body was cleaned out. I have checked for leaks in the intake manifold and vaccuum lines, but I cant seem to find anything that would cause it to act like this.

kewlcoconut · 10-05-2005, 06:18 AM

does anyone have a clue to what might my problem be?? because I hate driving the car for like 20 mins. then turning it off, and starting it 15mins later and have it act all retarded and just die like it does.

suprra_girl · 10-05-2005, 07:52 AM

have you tried the idle speed control valve?

http://www.cygnusx1.net/supra/librar...fi/FI_106.html

rnoswal · 10-05-2005, 04:15 PM

Mine had done that some, but not as bad as yours it sounds like. I made sure that the butterfly was closed all the way. It needs a small, small gap to keep it from sticking and then screw the idle adjuster all the way in then back out about 2 turns or so. I know the engine is hunting and it is very annoying. Make sure your timing is set to at least 10 degrees btdc. Try pinching off the vacuum retard on the distributor when it is running and see if that does anything.

The ISC can be the culprit too, so make sure the electrical plug is all the way in along with the plug in for the throttle position sensor. Try pinching off vacuum lines too. Make sure your bellows is tight and has no cracks.

I am just throwing out a lot of things but I got mine to start up and run smooth eventually by checking all those things.

Keep us informed.

Russ

kewlcoconut · 10-06-2005, 08:00 AM

alright, i will check all of those things in the next few days when i have time. and i will keep you posted on whats going on. i appreciate the help on this problem.

h8z2luze · 08-29-2006, 02:04 AM

Sorry to bring up an old post but I have the exact same problem and I have checked all that stuff. Please help!

Does anyone have a diagram on how to check the TPS ??????

ravenmaster · 08-29-2006, 04:40 PM

Okay first and formost this problem is somethin I had as well. I know his might seem stupid, but check the preheater hose (this is the piece between the AFM and the throttle body, the part with the big round thing on it, the silencer) and check for leaks in the house. If there is is can cuase this big time. It is exactly what happnened to me. It also could be a problem with your AFM itself.

h8z2luze · 08-29-2006, 11:11 PM

I am going to redirect this to my other post....

http://www.toyota-supra.info/forums/...9547#post29547

10-05-2005, 07:52 AM	#13
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	have you tried the idle speed control valve? http://www.cygnusx1.net/supra/librar...fi/FI_106.html __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

08-29-2006, 02:04 AM	#16
h8z2luze 12psi boost Join Date: May 2006 Location: Nor*Cal Posts: 338	Sorry to bring up an old post but I have the exact same problem and I have checked all that stuff. Please help! Does anyone have a diagram on how to check the TPS ?????? __________________ 1989 Supra 7MGE MK3 5-speed project... http://www.cardomain.com/ride/2385505

08-29-2006, 11:11 PM	#18
h8z2luze 12psi boost Join Date: May 2006 Location: Nor*Cal Posts: 338	I am going to redirect this to my other post.... http://www.toyota-supra.info/forums/...9547#post29547 __________________ 1989 Supra 7MGE MK3 5-speed project... http://www.cardomain.com/ride/2385505 Last edited by h8z2luze; 08-29-2006 at 11:14 PM.

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10-03-2005, 08:00 AM	#11
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	OK I will try and clear this up a little more lol. This problem of mine started not too long ago. I checked the diagnostics myself, and I thought I came up with TPS and knock sensor error codes. But then I took it to my mechanic, and they came up with only the knock sensor. So I misread the codes when I diagnosed it myself. And they replaced the sensor for me. Now my engine light is off. So it wasnt the TPS at all. But I still have the same problem. The throttle body was cleaned out. I have checked for leaks in the intake manifold and vaccuum lines, but I cant seem to find anything that would cause it to act like this.

10-05-2005, 06:18 AM	#12
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	does anyone have a clue to what might my problem be?? because I hate driving the car for like 20 mins. then turning it off, and starting it 15mins later and have it act all retarded and just die like it does.

10-05-2005, 04:15 PM	#14
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Mine had done that some, but not as bad as yours it sounds like. I made sure that the butterfly was closed all the way. It needs a small, small gap to keep it from sticking and then screw the idle adjuster all the way in then back out about 2 turns or so. I know the engine is hunting and it is very annoying. Make sure your timing is set to at least 10 degrees btdc. Try pinching off the vacuum retard on the distributor when it is running and see if that does anything. The ISC can be the culprit too, so make sure the electrical plug is all the way in along with the plug in for the throttle position sensor. Try pinching off vacuum lines too. Make sure your bellows is tight and has no cracks. I am just throwing out a lot of things but I got mine to start up and run smooth eventually by checking all those things. Keep us informed. Russ

10-06-2005, 08:00 AM	#15
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	alright, i will check all of those things in the next few days when i have time. and i will keep you posted on whats going on. i appreciate the help on this problem.

08-29-2006, 04:40 PM	#17
ravenmaster 12psi boost Join Date: Aug 2006 Location: Being not duly informed, I refuse to answer with any degree of accuracy for fear of prevaricating Posts: 265	Okay first and formost this problem is somethin I had as well. I know his might seem stupid, but check the preheater hose (this is the piece between the AFM and the throttle body, the part with the big round thing on it, the silencer) and check for leaks in the house. If there is is can cuase this big time. It is exactly what happnened to me. It also could be a problem with your AFM itself.