[Gmecm] Re: Gmecm Digest, Vol 29, Issue 3

[Jared Ryan]

I had the same thought.  Are you sure you don't have a leaking injector  
or gasket?

I chased a problem similar to this for seven months.  It turned out  
that an O-ring around one of the injectors was crushed, and fuel was  
leaking down into the manifold.  It would start instantly cold, but hot  
I'd have to hold the throttle full open to get it to catch.  It would  
also idle very rich.  I finally figured it out when I smelled gas with  
the car parked, and followed my nose.  Taking off the air cleaner lid  
(TBI) and having someone turn the key to turn on the fuel pump while I  
watched the throttle body finalized the diagnosis.  Installing new  
injector O-rings solved the problem.

Just my experience, for whatever it's worth.

  ---> Jared Ryan <---
jryan at caminofx.org | http://www.caminofx.org

On Jul 12, 2007, at 5:45 PM, Dan and Deanna Jones wrote:

> Mike,
> Forgive this question if it seems dumb, but I have run into the same  
> kind of starting problems in the past on stock setups on direent  
> brands of engines, that were cured by replacing the injectors or  
> having them cleaned. In the cases I experienced, the injesctors were  
> leaking slightly, slowly flooding the engine. I wonder if there would  
> be some value in installing a fuel guage and monitoring the pressure  
> after shutoff. In most efi systems if the fuel pump check valve is  
> good and the injectors are good, the system will hold full pressure  
> for a couple of days.
>
> Dan
>
>> Message: 1
>> Date: Wed, 11 Jul 2007 18:28:14 -0600 (GMT-06:00)
>> From: Mike Frels <mfrels at ix.netcom.com>
>> Subject: [Gmecm] Warm start problem...
>> To: diy_efi at diy-efi.org, gmecm at diy-efi.org
>> Message-ID:
>> <29180054.1184200095220.JavaMail.root at elwamui- 
>> milano.atl.sa.earthlink.net>
>>
>> Content-Type: text/plain; charset=UTF-8
>>
>> I am trying to diagnose a hot or warm start problem. I've got a gm  
>> TPI 350 running $8D for a 305 that has been modded to work with my  
>> setup. Morning starts she fires right up. Hot starts if she's only  
>> been sitting for less than 10-15 minutes also fine. A restart between  
>> 15 minutes to 5 hours sitting takes some cranking. Looking through my  
>> tables I've got various Start Up Enrichment and Crank Fuel Pulse  
>> Width settings that I am thinking I need to adjust. Can someone  
>> enlighten me on what the differences between Start Up Enrichment and  
>> Crank Fuel Pulse Width? BTW I have acquired this summer time problem  
>> since I switched to LS1 injectors last year.
>>
>> Mike
>>
>>
>> ------------------------------
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>>
>> End of Gmecm Digest, Vol 29, Issue 3
>> ************************************
>
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