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04-14-2012, 07:17 PM
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Intake
Join Date: Jan 2011
Location: Staten Island NY
Posts: 44
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when i start the car cold it starts idle at around 900-1000 rpm...within about 3 seconds of this idle the check engine light goes on, at that exact moment idle drops to around 500 rpm and starts to fluctuates from 500-600rpms.. if i give it throttle to around 1000 the check engine light goes off, as soon as i let off throttle from that time the rpms drop to a stumbling 450-300 rpms with check engine light back on then returns to the 500-600 rpm range.
i started looking at the TPS connection and removed the wire harness for inspection.. i forgot to reconnect and started the engine..to my amazment there was NO difference in the cars idle or rpm from previous description above.. whatcha think??? i think i might be getting somewhere.. help me plz 
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1987 toyota supra turbo/targa 7mgte |
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04-14-2012, 08:01 PM
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#2 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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Code 51 AC signal on; IDL switch open (part of the TPS). This code will only appear if the IDL switch is open (ie: you're stepping on the throttle in diag mode or the TPS is not properly calibrated) or the A/C system is on or says it is. When the cause of the code is corrected it will automatically remove itself, no need to reset the ECU.
There's nothing amazing about these codes being present. Check electrical connections and wiring and then refer to the TSRM for data on how to test the sensors.
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04-16-2012, 11:59 AM
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#3 |
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Intake
Join Date: Jan 2011
Location: Staten Island NY
Posts: 44
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i will check my TPS once i get the multimeter....
curious what makes the few clicking sounds right after stall? is that the TPS? seems to be coming from the throttle area. ty for help btw...
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1987 toyota supra turbo/targa 7mgte |
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04-16-2012, 06:47 PM
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#4 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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The only thing that ticks after the engine is turned off is the ISCV while the ECU parks it.
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> |
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04-16-2012, 08:05 PM
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#5 |
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Intake
Join Date: Jan 2011
Location: Staten Island NY
Posts: 44
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Just found some info here on the forum that suggests that a ISCV thats clicking is working properly...so thats good, one less thing to purchase. It seems the throttle stop screw has been tampered with..i adjusted it and im not stalling anymore....now check engine light comes on when i let OFF the throttle and goes away when ON the throttle. Ill check what codes are present after work.
Ty cre
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1987 toyota supra turbo/targa 7mgte |
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04-16-2012, 10:17 PM
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#6 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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Tampered with how? How did you adjust it? Why do people always fuck with that. It never moves from its factory preset unless it's messed with.
The computer controls idle via the ISCV, it's plenty possible that the ISCV or it's airways are clogged too. Check for diagnostic codes.
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> |
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04-17-2012, 11:53 AM
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#7 |
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Intake
Join Date: Jan 2011
Location: Staten Island NY
Posts: 44
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i think it was tampered because there was yellow paint mark on the screw and it was not aligned.. only code im getting now is a code 31.. the code 51 is no longer present.
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1987 toyota supra turbo/targa 7mgte |
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04-17-2012, 05:41 PM
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#8 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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Ok, well, test the AFM and inspect it's wiring and connectors. Make sure the TPS is properly calibrated.
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> |
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