Idle too high

aamt07 · 09-08-2011, 03:51 AM

The timming is set perfect. But the tps might be the problem this is a jam engine so it could have been tampered with. I know it's electronically finds the best timing and idle for the car but 1600 is way too high how do I check it using the diagnostic plug what do I jump in the diagnostic plug to find the problem. Lol kinda do t know how to read it either I'm a newbe guys.

cre · 09-08-2011, 04:54 AM

See the MKIII FAQ section for the thread on how to check codes.... Generally a good place for a newbie to spend a LOT of time.

aamt07 · 09-08-2011, 05:41 AM

I checked the codes and I think I'm going to start with tps. I had codes 41 and 52 pop up so I'll be replacing that in the morning I actually have one from my old engine. Never thought it would be a dang sensor god this car has so many electrical componets lol. You live you learn but I'll post something tomorrow hope it does the trick. Thanks guys!

cre · 09-08-2011, 07:07 PM

52 is the biggie of those codes. I'd attend to that first. Typically it's a wiring issue, not the knock sensors themselves. Look again in the FAQ section for a thread on knock sensor problems or knock sensor rewiring.

Also, check if the mixture screw on the KVAFM has been tampered with. If it hasn't there will be a press fit plug hiding it in its cylindrical housing... otherwise the plug will have been drilled out.

***Could someone post a picture of the mixture screw on the KVAFM and also check if there is a two digit number near it? It should be the same as the VAFM when it comes to adjustment (see the new FAQ on this).

aamt07 · 09-08-2011, 09:04 PM

Sorry it's codes 42 and 51 I had them mixed up, but bot was I scared about code 52. 42 I think is because my speedo cable is broken. But I tried to change the tps man they don't make an easy part to take off!!!!

cre · 09-09-2011, 02:36 AM

You'll get both og those if you unplug the TPS while in diagnostic mode. Code 51 will occur if you just tap the throttle. Code 42 will only be caused by a failure or unplugging it.

It's easy enough to get off as long as you use the right size screwdriver... Pulling the throttle body and putting it on your workbench REALLY helps.

aamt07 · 09-09-2011, 08:05 AM

It looked like a pain I still haven't attempted to do it because I think my extra is bad also when I unplug the bad one on the car and plug the other one in it has no effect. I thought it would at least bogg it down. All the codes I'm showing are 41 42 & 51. I might have more in another test. lol this car is full of good codes it could be a lot worse.

09-08-2011, 03:51 AM	#1
aamt07 Stock Join Date: Oct 2010 Location: houston, Tx Posts: 24	The timming is set perfect. But the tps might be the problem this is a jam engine so it could have been tampered with. I know it's electronically finds the best timing and idle for the car but 1600 is way too high how do I check it using the diagnostic plug what do I jump in the diagnostic plug to find the problem. Lol kinda do t know how to read it either I'm a newbe guys. __________________ 91 TURBO TARGA TOP 5 SPEED PEARL WHITE.... UNDER CONSTRUCTION...

09-08-2011, 04:54 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	See the MKIII FAQ section for the thread on how to check codes.... Generally a good place for a newbie to spend a LOT of time. __________________ 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 --->

09-08-2011, 05:41 AM	#3
aamt07 Stock Join Date: Oct 2010 Location: houston, Tx Posts: 24	I checked the codes and I think I'm going to start with tps. I had codes 41 and 52 pop up so I'll be replacing that in the morning I actually have one from my old engine. Never thought it would be a dang sensor god this car has so many electrical componets lol. You live you learn but I'll post something tomorrow hope it does the trick. Thanks guys! __________________ 91 TURBO TARGA TOP 5 SPEED PEARL WHITE.... UNDER CONSTRUCTION...

09-08-2011, 07:07 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	52 is the biggie of those codes. I'd attend to that first. Typically it's a wiring issue, not the knock sensors themselves. Look again in the FAQ section for a thread on knock sensor problems or knock sensor rewiring. Also, check if the mixture screw on the KVAFM has been tampered with. If it hasn't there will be a press fit plug hiding it in its cylindrical housing... otherwise the plug will have been drilled out. ***Could someone post a picture of the mixture screw on the KVAFM and also check if there is a two digit number near it? It should be the same as the VAFM when it comes to adjustment (see the new FAQ on this). __________________ 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 --->

09-08-2011, 09:04 PM	#5
aamt07 Stock Join Date: Oct 2010 Location: houston, Tx Posts: 24	Sorry it's codes 42 and 51 I had them mixed up, but bot was I scared about code 52. 42 I think is because my speedo cable is broken. But I tried to change the tps man they don't make an easy part to take off!!!! __________________ 91 TURBO TARGA TOP 5 SPEED PEARL WHITE.... UNDER CONSTRUCTION...

09-09-2011, 02:36 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	You'll get both og those if you unplug the TPS while in diagnostic mode. Code 51 will occur if you just tap the throttle. Code 42 will only be caused by a failure or unplugging it. It's easy enough to get off as long as you use the right size screwdriver... Pulling the throttle body and putting it on your workbench REALLY helps. __________________ 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 --->

09-09-2011, 08:05 AM	#7
aamt07 Stock Join Date: Oct 2010 Location: houston, Tx Posts: 24	It looked like a pain I still haven't attempted to do it because I think my extra is bad also when I unplug the bad one on the car and plug the other one in it has no effect. I thought it would at least bogg it down. All the codes I'm showing are 41 42 & 51. I might have more in another test. lol this car is full of good codes it could be a lot worse. __________________ 91 TURBO TARGA TOP 5 SPEED PEARL WHITE.... UNDER CONSTRUCTION...

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
cant stop high idle	looneytune_2004	MKIII Supra	4	03-29-2011 07:05 PM
high idle	3.0trd	MKIII Supra	4	04-27-2008 03:37 PM
'92 7MGTE- high and unstable idle	liona	MKIII Supra	7	02-04-2007 03:18 AM
High idle	nickvash0104	MKIII Supra	21	07-13-2006 05:14 AM