How to Remove IAC?
Thread Starter
Racer
Joined: Jul 2001
Posts: 253
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How to Remove IAC?
I"ve done a search and I think I've got the gist :confused: It sounds like the TB has to come off to get the IAC off. I've got the 1 1/4 inch socket for it, but I read that you should use channel locks because you'll never get the socket on the IAC. :sad:
Any tips you can pass along? My mission is to clean up the possible carbon build up. :yesnod:
Any tips you can pass along? My mission is to clean up the possible carbon build up. :yesnod:
Team Owner
Joined: Oct 2000
Posts: 29,937
Likes: 22
St. Jude Donor '03-'04
Cruise-In 1-2-3-4-5 Veteran
Re: How to Remove IAC? (86VetteBill)
You're going to have to pull off the water inlet and outlet hoses unless someone's already done a bypass.
Get a big absorbent towel and put it under the TB/hoses and over the thermostat housing to avoid creating a huge wet mess.
You don't HAVE to take off the upper TB plate, and you probably shouldn't, to avoid damaging the gasket.
Pull the water hoses, unplug the TP sensor, unplug the IAC valve, unhook the other hoses, unhook the throttle cable, then just unbolt the TB. Take care that you don't damage the TB-to-manifold gasket. It'll be old and likes to crack and crumble. In fact, think about buying a new one before you take the car apart.
Once it's unbolted, get out the channel-locks and unscrew the IAC valve.
There is some one-time thread sealant on the old valve, and there will be new sealant on the new valve. Don't mess about with the retractable pintle on the new valve. If you try to force it in or pull it out manually at this point, you'll kill it.
Get some cleaner for Fuel Injection systems, specifically (not carb cleaner, the manual says not to use carb cleaner.) Get a soft, small bronze brush or very stiff nylon brush with a tiny head that you can use to get bristles in tiny nooks and crannies.
The water body and IAC body are bolted to the bottom of the TB. Another gasket to be careful of. Take off the IAC body, then just get out your cleaning kit and clean it until you're satisfied, or frustrated about the last little bit of carbon and varnish that won't come off. Becareful about getting solvent around the TP sensor.
Put everything back together. Then get someone else with an L98 engine to tell you the IAC reset procedure. :D
~Matt
Get a big absorbent towel and put it under the TB/hoses and over the thermostat housing to avoid creating a huge wet mess.
You don't HAVE to take off the upper TB plate, and you probably shouldn't, to avoid damaging the gasket.
Pull the water hoses, unplug the TP sensor, unplug the IAC valve, unhook the other hoses, unhook the throttle cable, then just unbolt the TB. Take care that you don't damage the TB-to-manifold gasket. It'll be old and likes to crack and crumble. In fact, think about buying a new one before you take the car apart.
Once it's unbolted, get out the channel-locks and unscrew the IAC valve.
There is some one-time thread sealant on the old valve, and there will be new sealant on the new valve. Don't mess about with the retractable pintle on the new valve. If you try to force it in or pull it out manually at this point, you'll kill it.
Get some cleaner for Fuel Injection systems, specifically (not carb cleaner, the manual says not to use carb cleaner.) Get a soft, small bronze brush or very stiff nylon brush with a tiny head that you can use to get bristles in tiny nooks and crannies.
The water body and IAC body are bolted to the bottom of the TB. Another gasket to be careful of. Take off the IAC body, then just get out your cleaning kit and clean it until you're satisfied, or frustrated about the last little bit of carbon and varnish that won't come off. Becareful about getting solvent around the TP sensor.
Put everything back together. Then get someone else with an L98 engine to tell you the IAC reset procedure. :D
~Matt
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: How to Remove IAC? (86VetteBill)
If you do a TB coolant bypass you can remove the IAC motor without removing the TB. Use cottom swabs with intake cleaner to clean the IAC pintel bore below the TB. Then use a small mirror to make sure there is no debris inside.
You can open the throttle plates to clean inside there too. Here too cotton swabs, intake cleaner and an inspection mirror work well.
You can open the throttle plates to clean inside there too. Here too cotton swabs, intake cleaner and an inspection mirror work well.
