[Diy_efi] lean running TBI

[Torbjorn.forsman]

Measure the signal from the O2 sensor (not the wideband one but the one connected to the ECM) and make sure that the voltage really drops down to zero relative to the ECM's signal ground when mixture is lean (and goes up to at least 0,85 V at rich mixture). Possible causes could be bad ground connections for the ECM harness or bad grounding of the part of the exhaust where the O2 sensor is fitted.

Best regards

Torbj?rn Forsman


-----Original Message-----
?mne: Re: [Diy_efi] lean running TBI
Fr?n: "Mike" 
Till: "Ashley Wagner" , "Do It Yourself fuel injection" 
Datum: 01/11/2010 02:32:04am

most ecu's I have come across wont adjust if it thinks its on idle (switch on throttle)
or engine not warmed up fully...

btw: your message defaults reply only to you not to list

At 02:59 AM 11/1/2010, Ashley Wagner wrote:
>Hello I have been tuning a 87 TBI setup and the ecm keeps leaning out  
>the fuel. This is despite the fact that my wideband says I am running  
>lean and the fuel should be richened up. I am running closed loop so  
>the ecm should adjust but it doesn't seem to be adjusting correctly.  
>Any ideas? thanks 
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