dailing in fuel

Vehicle specific forum for tuning the Foxbody Chassis Mustangs utilizing the LUX0, GUFA, GUFB, and GUF1 Strategy

dailing in fuel

Unread postby Bonk1070 » Sat Feb 02, 2019 2:16 pm

trying to get my fuel dialed in my idle afr is 17.0 to 19.0 once on the throttle up to cruise it runs 14.0 to 15.2 once at cruse goes back lean not sure were to make changes also I see the o2 sensors don't move very much is this normal


log idle to cruise.xdl
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Bonk1070
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Vehicle Information: 1965 mustang 1989 5.0 eec-iv quarter horse tuner

Re: dailing in fuel

Unread postby decipha » Sun Feb 03, 2019 12:00 am

no it looks like your o2 sensors are shut off. There is an o2 sensor enable/disable switch from the ecu that is used as a ground reference. It should be near the back of the cylinder head its usually an o-ring and is the hego ground wire. Make sure that wire is hooked up to either the head or a good ground. If you can't find that wire then you will have to jump the ecu wire off at the ecu connector to enable the hegos.

its not wise to go WOT until you have your fuel dialed in
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Re: dailing in fuel

Unread postby Bonk1070 » Wed Feb 06, 2019 9:49 pm

I checked my o2 plug wiring have switched 12v good ground and pins 29,43 ohm good to the ecm not sure why they are not turned on
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