C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Nov 2, 2016 | 05:40 PM
  #21  
geb@abq's Avatar
geb@abq
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Originally Posted by aklim
Sure it wasn't the wife? She might have decided to make him have an accident.

I'd get a scanner and see what the IAC counts are after I cleaned up the TB by removing the IAC. IAC housing, TB top plate, clean all passages and reassemble with fresh gaskets.

One would think so. In fact 2 experienced MB techs did. Results don't lie. Reading immediately went up by 0.2 volts and upstream warning went off? It doesn't influence the fuel mixture but it might inform the ECM in ways we don't understand
I rebushed the throttle body, and cleaned it really well when I had it apart. I replaced the IAC, and notice no appreciable difference. I have replaced so much stuff on it, can't really remember, but I think the one item that made a difference was replacing the upstream passenger side O2, It took away "most" of the serious miss. The previous owner had the dealer replace the upstream O2 on the driver side. Think I will check them over real good, and may just go ahead and replace, then I know. No codes.

I replaced the upstream passenger side with a Walker brand, it is about mid price. The least expensive is the Denso, and most expensive is AC Delco. I've heard stay away from the Bosch, but not sure about the others
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Old Mar 16, 2017 | 06:06 PM
  #22  
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geb@abq
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Originally Posted by geb@abq
Yeah, wish I had known. I got in touch with the seller, and didn't seem too interested in letting me return it for that reason.

Well, as I mentioned before, I bought a (cheap) ICM from 1Aauto for $23.95, and it was defective. Started the car, and it would idle pretty good, but would not go over 2K rpm, and would miss and totally crap out. When starting, at end of cranking, just before starting, it would kinda kick back, way too far advanced with timing. Put the old one back on, and would start and run o.k. 1Aauto refunded my money for the ICM as well as for a (cheap) MAP sensor I didn't bother to install. They told me not to bother returning the parts, just throw them away. Anyway, I didn't know that an ICM would cause a symptom like that.

So, I ordered another ICM from Rock Auto, a Delphi, and it arrived today. Paid $63 for it----MADE IN CHINA
Figured I would follow up on the bad parts thing. I took my old ICM (OEM) and my new Delphi ICM to Autozone and had them checked,, and both failed. Had them check one of their new ones, it passed, I bought and installed it, and the car runs great for the first time since I have owned it. Never imagined that a bad ICM would cause such symptoms.
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