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

New engine, starts, won't run

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Old Jun 17, 2006 | 12:08 PM
  #21  
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Burning Brakes
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Default The Yellow Peril rides again!!!

It was just a spin around the block, but its been months so I was pleased...

Not smoking any tires yet, but progress still. I have a new ECM on its way to replaced my hacked up one, so maybe that will help my hunting idle, or at least I can hold out hope till it arrives...

Last edited by scranage; Jun 17, 2006 at 01:05 PM.
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Old Jun 17, 2006 | 07:32 PM
  #22  
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Burning Brakes
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As I was re-lashing the valves, the mail lady dropped of my new (used off Ebay) ECM. So I moved the memcal over and installed it. After the car warmed up, the idle stopped hunting and settled down, so I guess there was more wrong with my old ECM than just the TPS reference voltage output.

Anyway, I'm going to quit for the day while I'm ahead. Tomorrow I think I'll drain some coolant off, re-install the 58MM BBK, reset the IAC and take her for another spin.

Thanks everyone! I think I'm almost ready to take her down to the Dyno for the datalog and final tune. Soon we'll see if all the time and money was worthwhile.
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Old Jun 17, 2006 | 07:37 PM
  #23  
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LD85
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Drain that old gas out too, put some fresh hi octane in it
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Old Jun 17, 2006 | 09:20 PM
  #24  
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St. Jude Donor '05-'06
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Good to hear.It sounds like the IAC may still be an issue but run it and let the ecm learn before playing anymore.I was happy to assist I have not done it much lately so I hope I was some help to you.The Idle with the IAC un plugged should be ~500+or- But I have read some threads on the 58mm needing this type of treaking.Now have some fun.
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Old Jun 18, 2006 | 02:14 AM
  #25  
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The only sad news is that I have a bad case of clackty clack on the driver's side valve train that makes me think I have a bad lifter there. I tried re-lashing all the valves, and the problem is still there. I did install a new set of CC-850 lifters during the upgrade, but one of them may have been a dud. I'm going to try one more time to isolate the offender before I pull the intake again.
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