throttle body cleaning
Thread Starter
Racer
Joined: Sep 2005
Posts: 385
Likes: 8
From: north branford ct
throttle body cleaning
On my 1990 L98 with 54,000 on the engine I want to fix a slight rough idle and slight jerking when I am going slow and steady about 1500 rpms.So I thought I would clean the throttle body and the IAC,then adjust the TPS. how do I go about cleaning the TB --on the car or off --carb cleaner or something else. Also whats involved with getting the IAC valve out. Thanks for your help-Walter
Drifting
Joined: Jun 2005
Posts: 1,781
Likes: 0
From: Swanton VT 2000 Navy Blue Mettalic M6 / 1991 Auto - Steel Blue 68,500 R.I.P
I iv'e been told the best way is to take it off and do it . I'm going to do mine when I do some other projects Next Thurs/Friday .
Heres a link for the Techtips here on the CorvetteForum . I find the techtips that the forum offers ( It appears there written by forum members ) to be quite helpful
https://www.corvetteforum.com/techti...=195&TopicID=2
Good luck
,
PatsFan
Heres a link for the Techtips here on the CorvetteForum . I find the techtips that the forum offers ( It appears there written by forum members ) to be quite helpful
https://www.corvetteforum.com/techti...=195&TopicID=2
Good luck
, PatsFan
Le Mans Master
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
Originally Posted by mudslide
On my 1990 L98 with 54,000 on the engine I want to fix a slight rough idle and slight jerking when I am going slow and steady about 1500 rpms.So I thought I would clean the throttle body and the IAC,then adjust the TPS. how do I go about cleaning the TB --on the car or off --carb cleaner or something else. Also whats involved with getting the IAC valve out. Thanks for your help-Walter
When re-installing IAC, measure from base flange (w/gasket off)to tip if it is over 25mm you will have to hold the base and push in the pintell to retract it. Check the TPS w/a vohm meter to see if it is fuctioning correctly w/no dead spots in voltage and for setting at idle key on, engine off. I would also recheck the min. air (idle) setting.
Last edited by mseven; Apr 23, 2006 at 10:22 AM.
Team Owner
Joined: Oct 2000
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From: Fort Knox, KY
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After you remove it, buy a can of that Valvoline SynTech TB cleaner. Use some shop towels and an old toothbrush to clean the assembly up real good. You might want to even take a rag and dab some brake parts cleaner on it and clean out the plenum ports, too.
The Valvoline TB cleaner runs about $2 a can at NAPA and other auto parts stores.
I just removed and cleaned my TB and IAC motor this past weekend and my base idle has been restored and the throttle response is much improved.
The Valvoline TB cleaner runs about $2 a can at NAPA and other auto parts stores.
I just removed and cleaned my TB and IAC motor this past weekend and my base idle has been restored and the throttle response is much improved.
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
Originally Posted by mudslide
THanks guys but im not haveing the same luck --the car still idles like crap after all that--runs good under power but not steady or at idle
Thread Starter
Racer
Joined: Sep 2005
Posts: 385
Likes: 8
From: north branford ct
Dont know , if it was wires I would feel it under exceleration -cap ?? rotor?? Or maybe a bad Iac just because I cleaned it probably dosnt mean its ok. I dont have a tool to check it
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by mudslide
THanks guys but im not haveing the same luck --the car still idles like crap after all that--runs good under power but not steady or at idle
RACE ON!!!
Thread Starter
Racer
Joined: Sep 2005
Posts: 385
Likes: 8
From: north branford ct
Ill look again in the fsm but that thing is no better than the chiltons I have do this and do that but no explenations on how to do it. It is so much better to talk to someone on here who has done it and explans it so a moron like me can understand it--know what I mean?
