mixture control solenoid
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I don't think that there is any such thing. Early 80's Carb'ed engines had an MCS in the electronically controlled Carb...but not an '85 'Vette.
Where is this item located on the engine?
Where is this item located on the engine?
Thread Starter
Advanced
Joined: Feb 2014
Posts: 50
Likes: 0
I had a mechanic check out my car, said it has something to do with emissions and said I should replace it. Could he have meant something else.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
He's probably talking about the IAC - Idle Air Control. Typically the passages in the throttle body get dirty and cleaning them will fix IAC problems in most cases (and not require a new IAC).
It's possible he's talking about the TPS (Throttle Position Sensor). They do need to be adjusted. They seldom fail.
Another possibility is that it's the EGR (Exhaust Gas Recirculation) valve. The EGR passages can get plugged up with carbon. There's also an EGR solenoid involved that controls it.
It's possible he's talking about the TPS (Throttle Position Sensor). They do need to be adjusted. They seldom fail.
Another possibility is that it's the EGR (Exhaust Gas Recirculation) valve. The EGR passages can get plugged up with carbon. There's also an EGR solenoid involved that controls it.
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Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
My experience is that a hesitation off idle is caused by a vacuum leak.
I guess an EGR valve stuck open would qualify as a vacuum leak. In my case the EGR solenoid was bad and caused the EGR valve to stick, so both of these need to be checked.
I guess an EGR valve stuck open would qualify as a vacuum leak. In my case the EGR solenoid was bad and caused the EGR valve to stick, so both of these need to be checked.