Re: Request for Diagnostic help (sorta NC)

["Programmer" <nwester@eidnet.org>]

Sent ya a faxmail--hope you get it (and can view it).

Lyndon.
----- Original Message -----
From: Brent <wildkat@paonline.com>
To: <gmecm@diy-efi.org>
Sent: Friday, December 15, 2000 10:03 PM
Subject: Request for Diagnostic help (sorta NC)


> I'm begging for some help.  Please excuse the offtopic post.  If you
> respond, please do so offlist.
>
> I'm working on a friends '86 Camaro, LG4, auto, CCC carb, stock.
>
> Around thanksgiving the car severely lost power.  The next day it would
not
> start.  Would crank and sounded like it was trying to run.
>
> A tech was called, he installed a new ign module.  The car still wouldn't
> start.
> 2nd party installed a new timing chain.  The old timing chain was fine.
> Still no start.
>
> I pulled some plugs.  They were fouled badly.  I checked the coil with
DVOM.
> Coil tested bad.
> Installed plugs and coil.  Car lit right up. First try.
> Ran great.  Adjusted timing to factory spec (off 6d).  Continues to run
> good.
> I notice the choke heater not operating properly (owner is planning to fix
> it later).
>
> One week later, car severly looses power,  the same as before.  Engine
> shaking the car.   Refuses to start next day.
> Owner cranks the car in several attemps to start the car.  No good.
>
> I pull plug # one.  Slightly black (suspected choke heater failing), not
> wet.   I crank the car and finally after pumping the throttle many times,
it
> starts.   It runs horribly and requires 1/4 throttle to maintain 1100rpms.
> We hold the choke open and the engine gains 100 rpms. Still VERY rough.
> Sounds like 3-4 cyls at the most firing.  Engine never cleans up.
>
> I suspect ignition trouble.  So I follow Helms procedure to check the HEI.
> Coil, module, pickup all test ok.  Parts  store tests module as ok.  Scan
> tool reveals all sensors within spec.  M/C solenoid clicking happily.
With
> the 4 wire est connector disconnected it won't start.  Dissy shaft cannot
be
> turned, pin not sheared.
>
> Hair pulling out begins.
>
> If anyone can offer a suggestion, I would greatly appreciate it.
> Some other parties want to throw parts at it  (carb, dissy)  and I just
> can't see doing that.
>
> Regards,
> Brent
>
>
>
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