This idle makes me want to blow my brains out

[crappycoco]

To test the ICV and AFM, disconnect them while idling. The car should react. AFM should make the engine sound rough, ICV should raise the rpm.

I had a bad ICV (which was leaking air through the connectors in the back) and nothing happened when you disconnected it.

So if you disconnect and nothing happens, take a meter and check the resistances on the outputs (should be in the bentley manual).

One of the other more obscure reasons for funky idles are the ground cables. Check those for wear too.

[liftedwj21]

Did you ever figure the problem. Out?

[foundation982]

Have you checked the idle temp switch? The one with the two exposed spade contractors? It's a coolant temp sensor that triggers the idle control module. If it's faulty you will have a high idle.

Still can't get it to idle just replaced both coolant temp sensors. Brown one with single prong and blue one with double prong, Unplugged the battery to reset the ECU and have the same exact symptoms.

[Andy.B]

Have you checked the idle temp switch? The one with the two exposed spade contractors? It's a coolant temp sensor that triggers the idle control module. If it's faulty you will have a high idle.

[jlevie]

Even if you have rebuilt the entire engine, that doesn't mean that there aren't intake leaks. Only a smoke test will tell for sure.

[foundation982]

AFM -> IAC -> TPS

If you've checked all of those than it has to be an intake leak.

If all else fails check the ECU.

Haven't fully tested the AFM not sure how to, I can look into it in the bentley. I recently just moved and have a ton of other crap to do so it may be a while for me to get around to it. I have tested the IAC and TPS and are working as they should. I suspect there may be a leak near the brake booster as that is the only part of the intake I have no rebuilt/replaced.

[jd_e30]

I should clarify for you. My bad idle overall was from those 2 things. My high idle specifically was from the cruise control cable while my rough idle was from loose #6 plug wire.

[702pjc]

AFM -> IAC -> TPS

If you've checked all of those than it has to be an intake leak.

If all else fails check the ECU.

[foundation982]

I'm starting to wonder if something with the hydrobooster braking system is causing a leak. I don't have time this weekend to mess with it as I am moving to TN woo! but I will check it out when I get a chance still have a moderately high idle at 1000-1300 rpm.

[foundation982]

With the car on take a screwdriver and tap on the icv, does idle change at all?
Also ohm out your sparkplug wires and coil, check ends on wire and cap for any sign of corrosion. Also have your valves ever been adjusted?

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I have tried changing the idle with that, according to the bentley it changes the resistance. It makes no difference when I change it and set the screw back in the place it was. Cap and rotor probably need to be replaced but this shouldn't cause a high idle as far as I'm aware of, however they would cause a weak spark. Valve clearances adjusted when I bought the car about 10k miles ago.

Have you checked/adjusted throttle cables? My bad idle was a result of both bad plug wires (loose #6) and most importantly the cruise control cable mount, which was broken. Make sure your cable is adjusted correctly! Just a thought! My idle would slowly creep up from 1100 all the way to 2-3k!

Checked throttle cable it should be where it's at, The cruise cable also has no tension on it, unless when the car turns on for some wear reason it pulls it haven't checked while running. I'm confused why a bad spark plug wire would cause a high idle? is the computer trying to compensate for weak spark and dumping more fuel in?

[jd_e30]

*jeopardy music*

[jd_e30]

Any luck?

[jd_e30]

Have you checked/adjusted throttle cables? My bad idle was a result of both bad plug wires (loose #6) and most importantly the cruise control cable mount, which was broken. Make sure your cable is adjusted correctly! Just a thought! My idle would slowly creep up from 1100 all the way to 2-3k!

[Danny915]

With the car on take a screwdriver and tap on the icv, does idle change at all?
Also ohm out your sparkplug wires and coil, check ends on wire and cap for any sign of corrosion. Also have your valves ever been adjusted?

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[foundation982]

Did you try the tps sensor?


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Yep as the comment above says ^ its working as it should.