Sticky throttle body, but only when running?

BillyDoc · 12-03-2008, 04:25 PM

I just replaced the fuel pressure regulator on my 93 3S-GTE engine and it seems to run very nicely now ---- except that the throttle locks in place whenever the thing is running! With the engine off, I can turn the throttle valve easily at the throttle body, with the engine running at idle, it's locked! It isn't the cable at all. Something in the throttle body itself is keeping it from turning the butterfly valve (I think).

I know I screwed something up here, but what? I didn't actually touch the throttle body assembly except to disconnect it and push it aside, then put it back.

Any ideas? Thanks for any help!

BillyDoc

Ben · 12-03-2008, 09:11 PM

If you are sure that there is no binding in the cables, I would first clean the throttle body. The only thing that can bind and restrict the butterfly valve other than carbon build up is the TPS (throttle position sensor) on the side of the throttle body.

BillyDoc · 12-04-2008, 05:24 PM

Thanks Ben, you were right it was a heavy layer of carbon on the inside of the throttle body. Apparently, when the engine was running at idle the vacuum was enough to pull the butterfly valve against some hard stuff. I cleaned it all up and the problem went away. There are so many sensors and gadgets on this machine that I was worried that there was some kind of widget actively working in there.

Thanks again!

BillyDoc

Ben · 12-05-2008, 12:24 AM

Glad you fixed it

12-03-2008, 04:25 PM	#1 (permalink)
BillyDoc No Skills Join Date: Dec 2008 Posts: 32 Thanks: 5 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Sticky throttle body, but only when running? I just replaced the fuel pressure regulator on my 93 3S-GTE engine and it seems to run very nicely now ---- except that the throttle locks in place whenever the thing is running! With the engine off, I can turn the throttle valve easily at the throttle body, with the engine running at idle, it's locked! It isn't the cable at all. Something in the throttle body itself is keeping it from turning the butterfly valve (I think). I know I screwed something up here, but what? I didn't actually touch the throttle body assembly except to disconnect it and push it aside, then put it back. Any ideas? Thanks for any help! BillyDoc

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12-03-2008, 09:11 PM	#2 (permalink)
Ben Same In The End Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,910 Thanks: 18 Thanked 276 Times in 258 Posts My Google Map iTrader Rating: (11/100% )	If you are sure that there is no binding in the cables, I would first clean the throttle body. The only thing that can bind and restrict the butterfly valve other than carbon build up is the TPS (throttle position sensor) on the side of the throttle body.

12-04-2008, 05:24 PM	#3 (permalink)
BillyDoc No Skills Join Date: Dec 2008 Posts: 32 Thanks: 5 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Thanks Ben, you were right it was a heavy layer of carbon on the inside of the throttle body. Apparently, when the engine was running at idle the vacuum was enough to pull the butterfly valve against some hard stuff. I cleaned it all up and the problem went away. There are so many sensors and gadgets on this machine that I was worried that there was some kind of widget actively working in there. Thanks again! BillyDoc

12-05-2008, 12:24 AM	#4 (permalink)
Ben Same In The End Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,910 Thanks: 18 Thanked 276 Times in 258 Posts My Google Map iTrader Rating: (11/100% )	Glad you fixed it