85 Vette Idle Problem - HELP!!!!

[Len Sabatine]

    Your ECM [ If it's the Origional One] Shoud have the BCC on the label.
     Any one with a UV Eracer and prom burner should be able to load
    the image file. You may be able to locate matching BCC on gmecm site.

    Too much cam will always cause rough idle and fool with the MAP.

     Gently tap the MAF with a small screw driver handle , if engine stalls,
     replace the Maf...... Don't hammer on the MAF , tap gently.

     Issues like vacuum leaks , Egr valve leaks , slow response O2 sensor,
     leaky valve seats ,  Weak valve springs , to identify a few , can all be
     idle quality killers.  Fuel pump and pressure regulator bugs don't help .

     Merely replacing parts , doesn't necessarily mean anything will change,
     especially if the replacement part [s] aren't dead on spec.

     Blue Oval tuning techniques differ from GM , specifically , as well
    as the differences in the Engine Controllers.

    Tough to diagnose problems like this over the wire , bugs can reside in
    any vehicle hardware item. The devil is in the Details.
    One last thing , if you can't get any ALDL Data with a Scantool  , it's 
likely
    the ECM is Sick.
    Len




>HELP!
>
>I had my 85 Corvette motor rebuilt and the builder put in a slightly?
>different CAM.  Since the install (2 years ago) I can not get the car to
>idle.  It surges between 450 to 800.  I have replaced injectors, O2, EGR,
>IAC, (everything except MAF).
>
>I am working with a Chip company to get a chip to fix the idle, my
>assumption is that it is because of the CAM, however, we have not had any
>success getting the Chips to work.  During the process my original chip lost
>a pin, so now I have a new problem of not having a working chip at all.
>
>1.  What can I do to get a cheap replacement factory chip, I have 4-5 EPROMs
>that do not work (from the chip co.).  OR - where I can get the original
>code for the factory chip, I can have the chip company burn it onto an
>EPROM.
>
>2.  What can I do to make this car idle?  Has anyone seen this problem
>before and have anything that can solve it.
>
>The only Other thing it may be is the MAF, it set a MAF code about 1.5 years
>ago, I reset the computer (disconnected gnd) and I have never seen the code
>again.  So I assumed it to be an intermittent problem, maybe a bad
>connection, etc.
>
>The funny thing about this is I am a crew chief for a Drag Car, we run a Pro
>5.0 Mustang with a 302 - single turbo and run in the low 7's at 195 mph in
>the quarter mile.  I can tune this car no problem, but the factory stuff has
>me stumped.
>
>Thanks.
>
>Steve F
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