Thermowax Question
Thread Starter
Joined: Sep 2004
Posts: 1,583
Likes: 0
From: Hagerstown, MD
Thermowax Question
I'm having a problem with the fast idle on my '85 SE. I guess the thermowax heats up pushing the fast idle cam off of the roller on the throttle. Mine is not working so it binds against the roller and causes high idle. My question is can I do away with the fast idle cam all together? My car starts fine and idles right on 850 when I pop the cam away from the roller. Is it really needed? If so where can I buy replacement?
Last edited by BigPimpin'; Jun 22, 2005 at 09:52 PM.
84SE-EGI helpy-helperton
Joined: Oct 2002
Posts: 3,584
Likes: 542
From: Phoenix, AZ
Well, I have yet to see a problem with the fast idle cam and the roller on my 84SE, but if you can see where the roller is not releaseing the fast-idle cam when it should, I would start off by checking the springs on the throttle body rods.
If one of the springs has come loose, it will prevent the roller from disengaging from the fast idle cam, and keep your idle high even after the Thermowax pellet has been warmed by the coolant hose from the back of the WP. If the springs are good, and everything else is fine, then just give it a good lube with some spray silicone - this should fix any sticking that may be causing high idle conditions.
Worst case, replace the Thermowax Pellet (green thing hanging off the back of the TB) with a new part. The FSM says this should be changed with an interval tuneup, but I don't recall exactly how many miles they recommend. It may be $50 or so, but would fix the problem with the fast idle cam and also ensure that your vacuum powered 'Secondary Throttles' are opening up via vacuum pressure. These are the first set of butterflies when you look into the secondary intake tubes on the bottom of the TB. When cold, the first set of plates are closed to simulate a rich mixture as would be provided by a choke on a carbureated car. HTH,
If one of the springs has come loose, it will prevent the roller from disengaging from the fast idle cam, and keep your idle high even after the Thermowax pellet has been warmed by the coolant hose from the back of the WP. If the springs are good, and everything else is fine, then just give it a good lube with some spray silicone - this should fix any sticking that may be causing high idle conditions.
Worst case, replace the Thermowax Pellet (green thing hanging off the back of the TB) with a new part. The FSM says this should be changed with an interval tuneup, but I don't recall exactly how many miles they recommend. It may be $50 or so, but would fix the problem with the fast idle cam and also ensure that your vacuum powered 'Secondary Throttles' are opening up via vacuum pressure. These are the first set of butterflies when you look into the secondary intake tubes on the bottom of the TB. When cold, the first set of plates are closed to simulate a rich mixture as would be provided by a choke on a carbureated car. HTH,
Thread Starter
Joined: Sep 2004
Posts: 1,583
Likes: 0
From: Hagerstown, MD
Thanks for the answer. I've checked all the springs and they all are fine. I say it's the thermowax pellet because I let the car run and it never moves. I have lubed it, and the only way to slow the idle down is to release it is turning it by hand. Who sells thermowax pellets?
Thread
Thread Starter
Forum
Replies
Last Post
Adaptronic S5 Turbo PNP Unit questions
_Tones_
Adaptronic Engine Mgmt - AUS
10
May 25, 2021 05:37 AM
Nosferatu
2nd Generation Specific (1986-1992)
7
Sep 5, 2015 02:13 PM
