going lean during shifting - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 3 Old 02-05-2012, 01:17 PM Thread Starter
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going lean during shifting

I'm getting a stumble/backfire under load after a shift, especially around cold start. I've read this is a known(?) tip-in issue...At operating temps (180), it's goes away.

Basically, when I press the clutch pedal, A/F goes to 17:1, and when I engage it under good load, I get a stumble.and then the A/F eventually goes back to normal 12:1-15:1). This is on a t4m0 eec with an LMAF stock curve, and 60# inj using Ford's advertised slopes/breakpoint.

I've changed the VE and turned off tip-in, and even clocked the MAF, but just can't get rid of this problem. Any ideas? Do I need to adj the accel pump tables or HEGO tables (stock EGO locations)?


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post #2 of 3 Old 02-08-2012, 08:40 PM
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shut off coasting fuel shut-off in the tune.


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post #3 of 3 Old 02-16-2012, 03:41 AM
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I'm not an experienced tuner, but what you're talking about sounds to me like the accelerator pump (or whatever the equivalent is in fuel injection.
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