TPS or Knock Sensor??

kewlcoconut · 10-02-2005, 06:58 AM

well i dont have any error codes at all. it was all fixed. but this problem persists. there is definetly something wrong though. it was never like this before.

suprra_girl · 10-02-2005, 12:36 PM

it seems as tho you are talking 3rd person.... did someone else do your diagnostics & repair? or just repair?

if you are unsure on how to do diagnostics yourself there are plenty of ppl here including myself that can help you out

so... we'll start from square 1 and ignore tps & knock sensor

have you tried looking for leaks? intake manifold, vacuum lines etc?

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.

10-02-2005, 12:36 PM	#2
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	it seems as tho you are talking 3rd person.... did someone else do your diagnostics & repair? or just repair? if you are unsure on how to do diagnostics yourself there are plenty of ppl here including myself that can help you out so... we'll start from square 1 and ignore tps & knock sensor have you tried looking for leaks? intake manifold, vacuum lines etc? __________________ 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!

10-05-2005, 07:52 AM	#5
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!

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10-02-2005, 06:58 AM	#1
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	well i dont have any error codes at all. it was all fixed. but this problem persists. there is definetly something wrong though. it was never like this before.

10-03-2005, 08:00 AM	#3
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	#4
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	#6
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	#7
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.