Rough idle after throttle body spacer

Black_GT · January 1st, 2012, 02:31 AM

Just installed the throttle body spacer I bought off am and it idles almost like it has a cam but it runs fine. What could be causing this?

Btw I tried unplugging the battery, I left it unplugged for 5 mins and it still does it.

99GT35thLE · January 1st, 2012, 08:03 AM

Sounds like a vacuum leak. Check all of your vacuum lines including the one on the backside of the plenum.

By the way the spacer was a waste of money and time spent putting it on.

DickH · January 1st, 2012, 08:12 AM

Probably a leak between the spacer and the throttle body or plenum. Make sure the gaskets are good and the bolts are snug and of course make sure all the vac lines and whatnot are plugged in, you may have bumped something and pulled it out.

cliffyk · January 1st, 2012, 09:28 AM

Originally Posted by 99GT35thLE

Sounds like a vacuum leak. Check all of your vacuum lines including the one on the backside of the plenum.

By the way the spacer was a waste of money and time spent putting it on.

That was going to be my comment, take the spacer off and re-install the TB--then use the spacer as a unique paperweight...

doubleohvert · January 1st, 2012, 09:42 AM

check the EGR pipe. I had the same issue when i installed a UPR spacer. I thought the EGR pipe was tight enough until I started the car and my buddy as like "damn hen did you get cams?" Its a pita t get on tight because its barely long enough for stock, the you raise it 1/2"

SSG Pate · January 1st, 2012, 10:50 AM

sounds like your TB gasket is leaking, sometimes they get pinched during the install, did you use a new gasket? I always put silicone on my oring style gaskets during the install it keeps them from pinching and they slide into place better.

cliffyk · January 1st, 2012, 11:15 AM

If you use any sort of sealant on the intake (or for that matter at all anywhere on the engine) make certain it is labeled "oxygen sensor safe", those that are not can damage O2 sensors even if used in very small amounts...

SSG Pate · January 1st, 2012, 11:17 AM

Originally Posted by cliffyk

If you use any sort of sealant on the intake (or for that matter at all anywhere on the engine) make certain it is labeled "oxygen sensor safe", those that are not can damage O2 sensors even if used in very small amounts...

I was not talking about selant I was talking about lubricant.

but good point

January 1st, 2012, 02:31 AM	#1
Black_GT Newbie 1992 Mustang GT Join Date: Dec 2011 Location: Kansas City, MO Posts: 39 iTrader: 0 reviews	Rough idle after throttle body spacer Just installed the throttle body spacer I bought off am and it idles almost like it has a cam but it runs fine. What could be causing this? Btw I tried unplugging the battery, I left it unplugged for 5 mins and it still does it.

January 1st, 2012, 08:03 AM	#2
99GT35thLE Hardcore Enthusiast 1999 GT 35th LE Join Date: Dec 2009 Location: Jacksonville, Florida Posts: 1,428 iTrader: 0 reviews	Sounds like a vacuum leak. Check all of your vacuum lines including the one on the backside of the plenum. By the way the spacer was a waste of money and time spent putting it on. __________________ Drive it like you stole it

January 1st, 2012, 08:12 AM	#3
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,191 iTrader: 2 reviews	Probably a leak between the spacer and the throttle body or plenum. Make sure the gaskets are good and the bolts are snug and of course make sure all the vac lines and whatnot are plugged in, you may have bumped something and pulled it out. __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

January 1st, 2012, 10:50 AM	#6
SSG Pate Premium Member 00 Mustang GT Vert/88 5.0 Join Date: Sep 2010 Location: Tennessee Posts: 1,766 iTrader: 3 reviews	sounds like your TB gasket is leaking, sometimes they get pinched during the install, did you use a new gasket? I always put silicone on my oring style gaskets during the install it keeps them from pinching and they slide into place better. __________________ Proud Iraq and Afghanistan War veteran Powered By MMR 4.75L Stroker, Tuned at Kurgan Motorsports

January 1st, 2012, 11:15 AM	#7
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,803 iTrader: 1 reviews	If you use any sort of sealant on the intake (or for that matter at all anywhere on the engine) make certain it is labeled "oxygen sensor safe", those that are not can damage O2 sensors even if used in very small amounts... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

January 1st, 2012, 09:42 AM	#5
doubleohvert Regular 2000 mustang gt vert Join Date: Jul 2011 Location: rossville, ga Posts: 118 iTrader: 0 reviews	check the EGR pipe. I had the same issue when i installed a UPR spacer. I thought the EGR pipe was tight enough until I started the car and my buddy as like "damn hen did you get cams?" Its a pita t get on tight because its barely long enough for stock, the you raise it 1/2"

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

LinkBacks (?) LinkBack to this Thread: http://www.moddedmustangs.com/forums/99-04/244292-rough-idle-after-throttle-body-spacer.html
Posted By	For	Type	Date
Thread Idle surging after throttle body install \| Mustang Forums for All lFord Mustangs \| BoardReader	This thread	Refback	January 4th, 2012 10:06 AM

Threads Similar to: Rough idle after throttle body spacer
Thread	Thread Starter	Forum	Replies	Last Post
Throttle Body Spacer	mrperple	2005 - 2010 V6	31	April 2nd, 2011 08:39 PM
throttle body spacer	JASonic	V6 Mustangs	7	October 12th, 2007 11:35 PM
throttle body spacer	JASonic	The Clubhouse	11	July 18th, 2007 08:46 PM
new throttle body old spacer	cali 5.0	5.0 Mustangs	2	April 30th, 2007 12:33 AM
Throttle Body Spacer	MartinG83	V6 Mustangs	33	January 12th, 2007 05:04 PM

All times are GMT -4. The time now is 02:46 PM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.