[Gmecm] 7747 stumbling acceleration when cold

[Bill Hamilton]

Could be several things but is this a stock system or did you swap it onto another engine?
Have you logged any data?
Is it only in open loop?
My closed loop starts pretty quick.
Did it just start happening and used to run fine?
 
This must be a common problem as I have seen this same question a couple times this week on other boards.
 


Date: Sat, 27 Nov 2010 22:09:33 -0700
From: charles at taildragger.info
To: gmecm at diy-efi.org
Subject: [Gmecm] 7747 stumbling acceleration when cold

I'm hoping someone can point me in the right direction of what to change in my BIN to solve a bad cold acceleration issue with a 7747 TBI.  The truck runs great once warmed up, but when the engine is still warming up (and worse on colder days) it stumbles through it's acceleration, sometimes even backfiring.  It sort of comes off the line decently, then bogs down and gradually works its way up to speed.  Any pointers on what I might change to fix this?

Not sure if it matters, but this vehicle has an open air cleaner and no heat riser stuff.  I don't think that should be the issue since this happens even when it's 55 degrees out, but I thought I'd mention it in case.  Thanks. 
_______________________________________________ Gmecm mailing list Gmecm at diy-efi.org http://lists.diy-efi.org/mailman/listinfo/gmecm 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.diy-efi.org/pipermail/gmecm/attachments/20101127/3b64b814/attachment.html