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Old 08-22-2010, 02:49 PM   #1
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RPMs going from 1000 to 500

Hey Guys,

So I just got my supercharger rebuilt and put back on. As soon as I got it all back together my car has been idling like crap. It will go from 1000 rpms when I start it to 500 when I stop at lights. It doesn't happen all the time but about 60% of the time. The check engine light is on and I ran the codes, itís for both O2 sensors. I just replaced the MAF and didnít help. Let me know if you have any ideas?
Thanks


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Old 08-22-2010, 02:52 PM   #2
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Vacuum leak causing it to run lean or rich (o2 code). Check all your hoses and the gasket between the blower and manifold. That's where I had my problem.
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Old 08-22-2010, 05:18 PM   #3
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Well i just replaced about half the hoses with no luck. Its still doing it and the gasket between on the blower is new. Anyone have any other ideas? the rpms are just going up and down when im stopped. Anyone think it could be the tune?
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Old 08-22-2010, 05:35 PM   #4
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It was running before right? I tried using some sealant cause mine didn't come with a gasket. That didn't work too well. I also needed my holes retapped. Here's what mine looked like when I took the blower back off.
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Old 08-22-2010, 05:42 PM   #5
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It wasnt right after i reinstalled it, It was about a week later. I didnt use rtv or anything to make a gasket i bought a new one. I beleieve it did it before i got it rebuilt but no even close to this bad.
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Old 08-22-2010, 05:54 PM   #6
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Then it is probably your IAC valve.
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Old 08-22-2010, 06:56 PM   #7
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it could be the tune, mine does that a little bit if i put it in neutral at like 3k but wont stall. i heard this is a common problem with the svt tune, so maybe ur tune is having the same issues but worse..
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Old 08-23-2010, 02:56 AM   #8
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I see u have the stage 3 clutch, so do you also have the light weight flywheel to go with it? Cuz if you do, it's a rotational mass issue that needs to be fixed with the tune. I have seen other threads where people have the s/c and the light weight flywheel, and they get the same problem.
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Old 08-23-2010, 01:07 PM   #9
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Yes i do. well i plan on getting a tune SOON so i will let everyone know what the deal is as soon as i find out.
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Old 08-23-2010, 03:18 PM   #10
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Quote:
Originally Posted by disciplerocks View Post
Then it is probably your IAC valve.
x2 on that.
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