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 Sy/Ty Help
 749 ECM in Twin turbo Chev V8
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Author Previous Topic: New: help with Auto Prom/Tuner pro... Topic Next Topic: JEFF... 50 # chip  

Jimbo3927
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Posted - May 02 2007 :  06:59:15 AM  Show Profile  Reply with Quote
I've been having trouble getting mixture changes to respond. Also noticed on ALDL interogation that the "target air/fuel ratio" was a very rich 5.46. Any ideas on why the ECM would set this target?? There are no malfuntion codes and no SES light.

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ibmtech
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Posted - June 13 2007 :  6:58:25 PM  Show Profile  Visit ibmtech's Homepage  Send ibmtech an ICQ Message  Click to see ibmtech's MSN Messenger address  Reply with Quote
That rich should kick a check engine rich code. Are you using a WB02? Unless your 02 sensor isn't working properly. I just changed my Supercharger around and bumped up the boost pressure to 32 lbs. I had to seriously adjust my VE tables to get my afr to 14.2:1 at idle.

Billy Greene

Country: USA | Posts: 4 Go to Top of Page
  Previous Topic: New: help with Auto Prom/Tuner pro... Topic Next Topic: JEFF... 50 # chip  
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