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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. Probationary Members must limit their tech posts to this forum and sub-forums.

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Old 07-13-2011, 12:00 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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air conditioner shaking?


When I'm driving or sitting and turn on the a/c the whole car starts to shake. Why would this be?


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Old 07-14-2011, 10:15 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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Have you removed the belt and spun the pully by hand? The bearings could be bad.

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Old 07-14-2011, 11:22 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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How hard it shakes?.

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.
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Old 07-15-2011, 10:39 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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Well here's the thing, if im idling and turn on the a/c the rpm drops from 800 to 3 or 400

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Old 07-15-2011, 11:16 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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Are you Idling at all?.
If you have a bad Idling, It can be a leak.
Also check your ICS. It can starting to go off.
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Old 07-15-2011, 01:06 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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Quote:
Originally Posted by miguelmcv View Post
Are you Idling at all?.
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

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Old 07-15-2011, 04:15 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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Check your ICS and check your TPS as well.
But My bet goes to the ICS.
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Old 07-15-2011, 06:46 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #8 (permalink)
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Quote:
Originally Posted by miguelmcv View Post
Check your ICS and check your TPS as well.
But My bet goes to the ICS.

I think you mean ISC, not ICS.


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Old 07-15-2011, 07:27 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #9 (permalink)
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Quote:
Originally Posted by SeaveeDSM View Post
I think you mean ISC, not ICS.

By Bad.

(ISC).

Thanks to clarify.
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Old 07-15-2011, 07:34 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
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Try unplugging the AC compressor relay and turn on the AC, the compressor wont turn on but the idle should rise to about 1300, if it doesnt then either the ISC isnt compensating or check for +12V at pin 45 at the ECU
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Old 07-16-2011, 06:38 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #11 (permalink)
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Quote:
Originally Posted by stealth13 View Post
Well here's the thing, if im idling and turn on the a/c the rpm drops from 800 to 3 or 400
Sounds like you need to test your IAC coils and properly set your idle.

1G BISS Adjustment


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Old 07-18-2011, 08:19 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #12 (permalink)
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My car is a 2g, is that the same?

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Old 07-18-2011, 03:49 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #13 (permalink)
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Sounds like the a/c fan to me. Unless your rpm's are jumping erratically then I would think it has something to do with you ISC. Thats my educated guess. Does the belt screech?
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Old 07-19-2011, 09:10 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #14 (permalink)
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One of the belts screches pretty loud when I first turn it on when it's been sitting.

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Old 07-19-2011, 03:23 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #15 (permalink)
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Quote:
Originally Posted by stealth13 View Post
One of the belts screches pretty loud when I first turn it on when it's been sitting.
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.
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Old 07-19-2011, 05:50 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #16 (permalink)
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I have this same problem - its not the a/c fan. When i push the a/c button the whole car starts shuddering and rocking. And the idle drops much lower you can feel it working harder. I know its not the a/c fan because i just installed new slim fans and it still does it

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


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Last edited by eeeric16; 07-19-2011 at 05:54 PM. Reason: Auto-merged with previous post to prevent "bumping" within a 24 hour period Tips on avoiding the auto-merge feature - http://www.dsmtuners.com/forums/faq.php?faq=vb_faq#faq_bumping
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Old 07-20-2011, 04:59 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #17 (permalink)
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Quote:
Originally Posted by eeeric16 View Post
I have this same problem - its not the a/c fan. When i push the a/c button the whole car starts shuddering and rocking. And the idle drops much lower you can feel it working harder. I know its not the a/c fan because i just installed new slim fans and it still does it

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?
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Old 07-20-2011, 07:11 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #18 (permalink)
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Quote:
Originally Posted by Mackadoches View Post
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.


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Old 07-21-2011, 09:42 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #19 (permalink)
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Ya that sounds like mine, the rpm just drops from 800 , I can have lights and stereo cranked with 2 subs no problems, but the a/c... I dunno

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Old 07-22-2011, 01:50 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #20 (permalink)
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Quote:
Originally Posted by stealth13 View Post
Ya that sounds like mine, the rpm just drops from 800 , I can have lights and stereo cranked with 2 subs no problems, but the a/c... I dunno
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.
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