Quadra jet
- Thread starter 87cuttdawg
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it bumps the idle up a few undred rpm (can be adjusted) when the ac is kicked on to prevent bogging/stalling. especially helpful on v6s. i think it's called an idle-up solenoid... dont quote me on that.
It is an idle stop solenoid. It does 2 things. Steps up the idle for air-conditioning and also acts as an antidiesel device on some cars. It actually acts as the idle adjustment screw. It kicks out when the key is on and back in when you turn the car off. Completely closing the butterflies and preventing dieseling (run on). Not all cars got it.
Depends on what engine/carb you have and if it matches what was original in the car. If you have an idle load compensator, aka ILC, it is different than the idle speed solenoid, aka ISS. The electric jobbies, at least on VIN 9 engines, do absolutely nothing for anti-dieseling. They lay there doing nothing until the A/C is turned on, then they pop open to compensate for the RPM drop by the A/C compressor kicking in. When ignition is off or A/C is turned off, the solenoid retracts allowing normal idle speed.
The ILC works a bit differently. It does have anti-diesel solenoid and regulates vacuum to the compensator as needed to maintain idle or attempt to keep the engine from dieseling on shutoff. I have never messed with this kind of system, and I much prefer the ISS over the ILC any day. Too many moving parts for me on this ILC thing. With ISS, you can pretty much set it and forget it.
Here's a pic of vacuum routing diagram I posted in another thread if you HAVE the ILC in your 87.
Depends on what engine/carb you have and if it matches what was original in the car. If you have an idle load compensator, aka ILC, it is different than the idle speed solenoid, aka ISS. The electric jobbies, at least on VIN 9 engines, do absolutely nothing for anti-dieseling. They lay there doing nothing until the A/C is turned on, then they pop open to compensate for the RPM drop by the A/C compressor kicking in. When ignition is off or A/C is turned off, the solenoid retracts allowing normal idle speed.
The ILC works a bit differently. It does have anti-diesel solenoid and regulates vacuum to the compensator as needed to maintain idle or attempt to keep the engine from dieseling on shutoff. I have never messed with this kind of system, and I much prefer the ISS over the ILC any day. Too many moving parts for me on this ILC thing. With ISS, you can pretty much set it and forget it.
Here's a pic of vacuum routing diagram I posted in another thread if you HAVE the ILC in your 87.
Mine doesn’t have ILC but has ILC SOLENOID
Apparently then you're missing some stuff? Did someone change out the carb and not consider the ILC system? I dunno what to tell you on that. If you have the vacuum hoses without the stuff to hook it to, I suppose you could plug it off without issues except for not being able to compensate for a/c load.
Some E4ME carbs had an electric motor on that bracket to control idle speed. Stick with what matches the original ECM unless you've deleted the CCC (Computer Commend Control), in which case the E4ME will never work properly and you need an older carb that's jetted for your engine.
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