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Old 04-16-2002, 12:33 PM   #1
RaceCarRiot
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Unhappy car idles like poop with the a/c on.

this has been going on for quite a while, but only recently since it started raining again and i have to keep the windows clear, has it become ANNOYING.

my problem is this: the a/c works fine, as long as i'm not sitting idling. if i'm at idle, and the compressor clicks on, i get this HORRIBLE booty shaking shuddering lumpy idle that jumps up to where the engine should run with the compressor on, and then suddenly drops to where the engine almost stalls...car shudders hard, engine vibrates enough to knock the intake against the hood, lights dim, etc., then it jumps back up again. up, down, up, down, up, down, shake shake shake, until the light turns green.

then once you start moving again, serene smoothness.

it started doing this after an ECU reset in november or december, and the only breathing mods were intake and exhaust. any ideas at all?
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Old 04-16-2002, 01:43 PM   #2
live311
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How long have you been running the a/c since your reset? It's possible that the ECU just hasn't relearned the idle speed properly, thus can't adjust when the compressor kicks in. Take it to a dealer and have them plug in to reteach the idle. If that doesn't work, it could be something mechanical with your compressor, or possibly just a bad belt. I'm shooting in the dark but I think I at least sound like I think I know what I'm talking about.
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Old 04-16-2002, 01:45 PM   #3
SubaSonic
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Default Bad Idle

Try a higher grade of gas
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Old 04-16-2002, 02:05 PM   #4
RaceCarRiot
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Default Re: Bad Idle

Quote:
Originally posted by SubaSonic
Try a higher grade of gas
it's been run on 93 octane all the time since i put the chip in a few months ago, so i don't think that's it. it's been run with the a/c on during long highway trips, so it's not like it hasn't been used. but like i said, it works like it always has as long as there's motion involved...at idle, it just isn't happy.

i'll just let it sit and idle tonight when i get home from work, and see if it can't work it's demons out...

-adam-
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Old 04-17-2002, 02:11 AM   #5
Kostamojen
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Its your pullies.
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Old 04-17-2002, 03:09 AM   #6
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Quote:
Originally posted by Kostamojen
Its your pullies.
he's right

jeremy
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Old 04-17-2002, 09:17 AM   #7
RaceCarRiot
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the lightened crank/alternator ones, or the idler pulley that runs the compressor?

i replaced the idler pulley back in november or decemeber as well...the bearing in the old one burned up, and made the most hideous racket when the engine was running, so i just removed it back in september, and went sans a/c for a while...then after i replaced it and tried to use it again...shake shake shake at idle.

i thought it was my intake giving the ECU fits with the additional load of the a/c on the engine...it hisses like a den of cobras at idle when the compressor's on.

but if it's the lightened pulleys causing the problem...i guess i'll just live without a/c around town, or go back to OEM ones with a really light flywheel.

-adam-
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Old 04-17-2002, 01:04 PM   #8
HndaTch627
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it's the lightweight pulleys, they are transmitting the compressor engagement and disengagement thru the car into your but. Get the flwyheel, the gains are mUHC better.

jeremy
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Old 04-17-2002, 03:19 PM   #9
RaceCarRiot
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makes sense to me -- less dense material = less vibration damping. also as i recall, the stock pulley had a piece of rubber sandwiched into the middle, probably for that exact purpose. silly me.

i just don't get why there wasn't a problem until about 6 months after they were installed.

whatevarrr...i'll see if my friend still has the EJ18 he pulled out of his brighton laying around the shop, and just trade him for the OEM ones.

-adam-
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Old 04-18-2002, 01:13 PM   #10
AudioFan
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So are you 100 % sure that it is because of the pulleys?
I have the 3 set pulley on my car (1.6 L), for like a month now, and since yesterday or two days ago, it is not a normal idle, it goes down for a second, but not as you describe yours, just a little. Im worried that could get worse over time? Do you really think the problem are the pulleys?
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Old 04-18-2002, 02:45 PM   #11
Dolphin Overton
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Your A/C compressor might be halfway seized like mine is. I have the same problem.
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Old 04-18-2002, 03:23 PM   #12
HndaTch627
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Quote:
Originally posted by Dolphin Overton
Your A/C compressor might be halfway seized like mine is. I have the same problem.
yeah i was kinda thinking that...i need to get mine checked out, sounds like the compressor is ready to lock up...at least over the winter it did.

jeremy
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Old 04-18-2002, 04:12 PM   #13
RaceCarRiot
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Quote:
Originally posted by Dolphin Overton
Your A/C compressor might be halfway seized like mine is. I have the same problem.
would having it sit there unused for several months cause it to seize? sounds logical.

-adam-
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Old 04-18-2002, 10:32 PM   #14
HIHO
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You should run your air for a little while EVERY month. Just for a few miles, just long enough to get the oils flowing. Not only does it keep the compressor in shape it also keeps the seals oiled.
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Old 04-19-2002, 11:36 AM   #15
ImprezedRS
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My car has been doing this for the last week or so since I started using the ac again. I don't have the lightened pulleys, hell only power mods are intake, TCII, exhaust and Hyper SFC.

Hell my car will buck and then stall.
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