97 GT Fuel Cut-Off Issue - Ford Mustang Forum
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post #1 of 1 (permalink) Old 09-12-2013 Thread Starter
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Joined: Jan 2012
Location: Istanbul
Posts: 60
97 GT Fuel Cut-Off Issue

I have AEM Wideband AFR in my car. Also have Diablosport chip and a custom tune. But I have suspicions about my tune maybe you guys can help me. Here's my problem:

When I let of throttle while I'm cruising, AFR shows around 13,5 for 1-2 seconds, than it shows normal rate that around 14,7 which have to be shown at idle. I wonder that is this normal or is it rich?

My another question is about fuel cut-off. When I let of gas my AFR is about 14,7 which is normal at idle, but not seems like fuel cut.

However, for instance if I cruise around 120 mph and than let off throttle it seems like fuel cut-off exists until rpm's come down to 2000 because AFR becomes lean which can't be shown. Wideband only shows 3 little lines which means that afr is extremely lean (seems like cut-off).

So I strongly think that I'm burning more fuel than I need.

What do you think about it?

Stock Shortblock, TFS Heads, MHS Cams, FRPP PI Intake, Longtubes, BBK 78 mm Upper Intake Plenum, BBK Cai, FRPP 3,73's, FRPP 39 lb Injectors, SLP LM1's, Brembo Cobra R Brakes, Eibach Pro System Plus, 4R70W etc..
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