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Posted by stealth13, Jul 13, 2011
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.
My car used to do the same thing, But it was light shake.
The problem was my AC Fan, It was vibrating when turn on.
Replace the Fan and problem solved.
If you have a bad Idling, It can be a leak.
Also check your ICS. It can starting to go off.
it idles great when the a/c isnt on
But My bet goes to the ICS.
I think you mean ISC, not ICS.
Thanks to clarify.
Sounds like you need to test your IAC coils and properly set your idle.
1G BISS Adjustment
Yep a buddy of mine had this same problem. Although his car didn't shake like yours. The screeching was coming from his a/c belt. Which if thats the case for you, it narrows your point of issue down to your a/c unit/fan. I would think that is where your shaking issue is originating.
I was thinking it has something to do with low refrigerant in the compressor or something of that nature. Haven't really checked into it yet
This sounds like an altenator problem. My wifes car used to do this when she turned her headlights on. Have you had your altenator checked?
yes alternator checked out good. Haven't had any other problems related to the altenator. It only acts up when you push the a/c button and turn the fan on, but when i manually tested the fans to the battery they ran smoothly. I'm actually going to take a short video of what it does tomorrow and post it on this thread so you can see exactly.
The reason your RPMs drop with the AC on isn't because of the stereo, headlights, or disco ball in your car, it's because of the increased load on the engine.
As previously mentioned, check your ISC. When you turn your AC on, the ISC compensated for the increased load by opening up a little thus allowing more air in, and the RPMs should rise a little. (unless you've done some idle air nonsense to change that...) If they're dropping, I'm willing to bet your BISS is out of wack, or your ISC is toast.
To test the ISC, you want to disconnect the plug, get a DMM (digital multi-meter) and measure the resistance between pins 1-2, 2-3, 4-5, 5-6.
Someone might need to correct me here, but I believe you should get a reading between 28 - 32ohms. Higher is ok, lower.... well, I guess we'll see.
If you don't get any reading, or there is no connectivity between one of those 4 connections, your ISC is toast.
I'm going to set my base idle speed back up to 750 tomorrow. I'm looking in my haynes manual and not seeing anything for ISC
Scratch that, i was looking under cooling and a/c. found it in fuel and exhaust
Make sure you have the tools to set base idle (DSMlink ideally) Don't just go twisting and turning your BISS. If you set that incorrectly, then you're on the right path to burning the ISC out, and they aren't that cheap. Looking around $150 for a used one, unless you get lucky at the wreckers
Also, after i reset the idle my car won't start. It has enough volts to start, the starter is engaging but it won't turn over >.<