The unfixable mystery problem

carl johansson · 07-15-2009, 11:26 PM

First place I would look is the throttle position sensor - but to tell you the truth I don't even know if the supra has that. Alot of high performance shope sell a bogus "power enhancer" that is a throttle position switch that tells the computer that you are at full throttle - when you are only at 3/4. doesn't really add power - the petal still goes full - just no gain after3/4 throttle.

This problem sounds like the switch is working backward for some crazy reason! Like I said - it's a shot in the dark - but if someone burned a performance chip and it got screwed up - this could be the issue!
AFAIK - The Rev limiter on this engine is burned on the ECU chip! ( we hit it on occasion in the lemons racecar!)

Carl Johansson

GettaRobo · 07-15-2009, 11:28 PM

Well, to tell you the truth, the TPS has already been looked at. Unless the new TPS they brought in was screwed, it's working fine. Thanks for the suggestion though.

carl johansson · 07-16-2009, 02:30 AM

sorry,
didn't read all of the posts carefully enough. So if the TPS is OK - does this thing have a stock chip in it? Have you tried switching out the ECU with the one on the parts car?

GettaRobo · 07-16-2009, 03:00 AM

Yes, I knew I forgot to mention something! The parts car is a manual, but the ECU works fine with the auto and I think it shifts slightly better with the manual ECU. On a side note I'd like to point out that I started having these problems before I put the other ECU in, so I doubt it's the reason.

07-15-2009, 11:26 PM	#1
carl johansson 3" Exhaust Join Date: Nov 2007 Location: Auberry, California Posts: 141	First place I would look is the throttle position sensor - but to tell you the truth I don't even know if the supra has that. Alot of high performance shope sell a bogus "power enhancer" that is a throttle position switch that tells the computer that you are at full throttle - when you are only at 3/4. doesn't really add power - the petal still goes full - just no gain after3/4 throttle. This problem sounds like the switch is working backward for some crazy reason! Like I said - it's a shot in the dark - but if someone burned a performance chip and it got screwed up - this could be the issue! AFAIK - The Rev limiter on this engine is burned on the ECU chip! ( we hit it on occasion in the lemons racecar!) Carl Johansson Last edited by carl johansson; 07-15-2009 at 11:29 PM.

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07-15-2009, 11:28 PM	#2
GettaRobo 3" Exhaust Join Date: Apr 2009 Location: Saskatoon, SK Posts: 65	Well, to tell you the truth, the TPS has already been looked at. Unless the new TPS they brought in was screwed, it's working fine. Thanks for the suggestion though.

07-16-2009, 02:30 AM	#3
carl johansson 3" Exhaust Join Date: Nov 2007 Location: Auberry, California Posts: 141	sorry, didn't read all of the posts carefully enough. So if the TPS is OK - does this thing have a stock chip in it? Have you tried switching out the ECU with the one on the parts car?

07-16-2009, 03:00 AM	#4
GettaRobo 3" Exhaust Join Date: Apr 2009 Location: Saskatoon, SK Posts: 65	Yes, I knew I forgot to mention something! The parts car is a manual, but the ECU works fine with the auto and I think it shifts slightly better with the manual ECU. On a side note I'd like to point out that I started having these problems before I put the other ECU in, so I doubt it's the reason.