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Fitech issues and the resolution [message #364965] Thu, 24 June 2021 18:41 Go to previous message
skip2 is currently offline  skip2   United States
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
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Senior Member
Evening all, Haven't been on here much lately, not had a chance to use the beast much.
A couple of weeks ago went camping, only half an hour away, so not much real hard running. Got all the stuff out and went to part the beast and wouldn't come off of idle with any load ie putting in gear, turning wheel, AC on just would not keep running. Checked fuel delivery to the Fitech and was fine just would not move. I had my original, now spare Fitech, installed and crank and ran fine. This unit had over 385 hours run time and no problems that were it's fault, the one that went "bad" had less than 9 hours on it. I put on the new one only because I had the manifold off for oil leaks and thought it would be better and have a lot of the problems worked out Got my call from Fitech today and they said the trouble codes said IAC problem and ignition interference or something like that, and I could have probably just clear the codes and would have ran. They cleared the code and test ran on their test motor and all checked out good. i believe the IAC problem was the vacumn line to the shift modulator and vacumn gauge had come off and the IAC couldn't handle the adjustment. Now here's the head scratcher the ignition interference. I purposely had extended the wire for the tach signal with shielded cable and ran it down the left side of the manifold to avoid this. I checked it out and I noticed across the front of the manifold where the fitech harness lay there was still quite a bit of the blue tach signal wire from the factory not shielded and there was that great big 4ga cable I had install for my new high output one wire alternator I got from Jim Bounds, which when used with neat isolator/combiner he recommended, works great and seems to keep the batteries from overcharging. I guess I had the "perfect storm" when I had the vacumn line come off and the alternator must have shot a high amperage surge across the output and the fitech said "I don't think so". What I'm trying to say if anyone gets these codes these are good places to look. Also Fitech checked it out for NC even with it being 8 months out of warranty and is paying the freight back. Just thought someone might remember this if they ever have these problems.
Skip Hartline

74 Canyon Lands, FiTech, 3.7 FD LSD, Manny Tranny, Springfield Distributor, 2001 Chevy Tracker Ragtop Towd

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