Help!!

[art leong]

What are your wide band readings when it is cutting out?
Another trhing I've heard about are tachometer problems effecting the motor.

[Ed Wright]

Art, wide band doesn't change, voltage to the ECU doesn't show a change. Had the tach disconnected, still did it.

Thanks, Ed

[art leong]

Originally Posted by Ed Wright

Art, wide band doesn't change, voltage to the ECU doesn't show a change. Had the tach disconnected, still did it.

Thanks, Ed

I couldn't get a good O2 reading below 5500 (the O2 sensor is in the collector). I had to put an extension and a muffler to get the O2 to read in the lower rpm ranges. I found I was lean leaving the line (it never showed on the dyno). The car would stutter, pop and bang, leaving the line. With the motor cold. Richening it up between 4500 and 6000 cleaned it up.

[Patrick Butler]

I had this same problem and it turned out the Battery mount had broke at the bottom where I couldn't see it. Everything looked fine upon inspection but once the car launched it would rock out of the mount and short out on the chassis. I assume that since you changed your batteries that this isn't you problem but it sounds like some where down the line there is a short. May have to start tracing wires to see if any are chaffing and shorting out.

[Ed Wright]

Batteries aren't moving. Yesterday afternoon it cut off 5 out of 8 passes. Getting more frequent. It runs ten to twelve hundredths slower when it does it. Sounds like a loose connection, but according to the XFI internal data logger the voltage doesn't vary. May be too slow to catch it.

[Daran Summerton]

Different battery? Maybe internal plates? I'm just guessing here

[Ed Wright]

Originally Posted by Daran Summerton

Different battery? Maybe internal plates? I'm just guessing here

2 new 16 volt AGM batteries last week. Had 2 12s & alternator before that. No change.