Hi revs no control

batmmannn · 05-29-2010, 11:46 PM

Hey Guys,
I test drove my Red Supra and it did fine till I gassed it or goosed it. The revs went way up and stayed up I had to kill the ignition with the Key to slow it down. After shut down and restart it did fine till I goosed it again and then the same thing happened. I brought it home and parked it.

What does this sound like? The linkage looks to be fine. Could a Vacuum problem do this? an intake leak on the plenum I just put back on? Has anyone ever seen this happen before?

Edited later.
I did a search on this forum and found someone saying that vacuum lines swapped or a vacuum leak could cause revving.

Luckily I photographed my vacuum line positions before I took it apart. I found that I had swapped lines to the Plenum. I also did not have the metal T tube hoses all clamped. Should I re-torque the Plenum bolts? Could this have caused it?

Thanks, Scott

907mge · 05-30-2010, 04:08 AM

So unattended acceleration on a supra, sounds like a law suit, haha. The only thing I can think of is that your throttle body is sticking or the cables going to it. Because if you throttle body is closed the only place the engine can get air is from the idle speed control. And that t-pipe is your pcv which should not effect much if not clamped.

batmmannn · 05-30-2010, 04:27 AM

Thats cool. thanks for answering now how do I fix it???? hehe Don't think it's the cables cause if I turn the ignition off and restart then it goes back to normal till I gas it hard again. What about the plenum gasket leaking? Maybe I need to tighten the bolts more?

907mge · 05-30-2010, 03:54 PM

No its probably not the bolts, I didn't put a new gasket on when I took mine off the first time. All it did was cause a poor idle because of the unmetered air. Have someone watch the throttle underhood with the car off and someone pressing the pedal to see if the plate sticks.

batmmannn · 05-30-2010, 04:51 PM

Hmmm, Well I can try that but taking the motor to red line at a standstill is not something I like to do. So far it had only done it while driving. As far as the plate do you mean the butterfly inside the plenum or the throttle cable assembly? Thanks

907mge · 05-30-2010, 08:11 PM

I said with the car off and yes I am talking about the throttle plate. Its a simple way to see if it is sticking.

05-29-2010, 11:46 PM	#1
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Hi revs no control Hey Guys, I test drove my Red Supra and it did fine till I gassed it or goosed it. The revs went way up and stayed up I had to kill the ignition with the Key to slow it down. After shut down and restart it did fine till I goosed it again and then the same thing happened. I brought it home and parked it. What does this sound like? The linkage looks to be fine. Could a Vacuum problem do this? an intake leak on the plenum I just put back on? Has anyone ever seen this happen before? Edited later. I did a search on this forum and found someone saying that vacuum lines swapped or a vacuum leak could cause revving. Luckily I photographed my vacuum line positions before I took it apart. I found that I had swapped lines to the Plenum. I also did not have the metal T tube hoses all clamped. Should I re-torque the Plenum bolts? Could this have caused it? Thanks, Scott Attached Thumbnails __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile! Last edited by batmmannn; 05-30-2010 at 12:30 AM. Reason: Add Info

05-30-2010, 04:27 AM	#3
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Hi Revs Thats cool. thanks for answering now how do I fix it???? hehe Don't think it's the cables cause if I turn the ignition off and restart then it goes back to normal till I gas it hard again. What about the plenum gasket leaking? Maybe I need to tighten the bolts more? __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile! Last edited by batmmannn; 05-30-2010 at 04:30 AM.

05-30-2010, 04:51 PM	#5
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Hi Revving Hmmm, Well I can try that but taking the motor to red line at a standstill is not something I like to do. So far it had only done it while driving. As far as the plate do you mean the butterfly inside the plenum or the throttle cable assembly? Thanks __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cruise control	Rob1	MKIII Supra	0	05-18-2010 04:37 PM
Mirror Control doesn't work	Serge	MKII Supra	0	09-22-2008 12:56 AM
Weired Cruse Control Issue	Chambers	MKIII Supra	4	07-01-2008 02:11 PM
Lost control of my car today.	redmaro	Off Topic Forum	5	01-19-2007 05:04 PM
Retractor control box is the Integration Relay No.2	Burn N' Up	MKIII Supra	5	04-30-2006 08:49 PM

05-30-2010, 04:08 AM	#2
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	So unattended acceleration on a supra, sounds like a law suit, haha. The only thing I can think of is that your throttle body is sticking or the cables going to it. Because if you throttle body is closed the only place the engine can get air is from the idle speed control. And that t-pipe is your pcv which should not effect much if not clamped.

05-30-2010, 03:54 PM	#4
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	No its probably not the bolts, I didn't put a new gasket on when I took mine off the first time. All it did was cause a poor idle because of the unmetered air. Have someone watch the throttle underhood with the car off and someone pressing the pedal to see if the plate sticks.

05-30-2010, 08:11 PM	#6
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	I said with the car off and yes I am talking about the throttle plate. Its a simple way to see if it is sticking.