[Gmecm] Hard Starting

[Steve Ravet]

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Jared Ryan
> Sent: Tuesday, August 15, 2006 3:49 PM
> To: gmecm at diy-efi.org
> Subject: [Gmecm] Hard Starting
> 
> I just need a starting point for this.  I need a good guess 
> at which way to go to correct this problem.
> 
> This engine "catches" *fast* on a cold start.  I just turn 
> the key, and after a few revolutions it's running.  It 
> smoothes out, and the ECM gradually reduces the idle speed.  
> No problem.
> 
> On a hot start, it usually won't catch.  It cranks very fast, 
> but just doesn't catch.  However, if I hold my foot down all 
> the way on the accelerator pedal, it will always catch after 
> several seconds of cranking.  It's just like if I was trying 
> to clear a flooded engine and I open the throttle all the way 
> on a carburetor.  When it does catch after doing this, there 
> is a puff of black smoke from the tailpipes.  
> Once it catches, it idles smoothly and there is no problem 
> keeping it running.

When you hold the gas down while cranking the ECM goes into clear flood
mode.  You can read about this in the archives, basically the ECM
reduces or cuts off fuel delivery as long as it sees WOT while cranking.
Sounds like you need to take fuel out of the hot portion of the cranking
fuel tables.

--steve


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