Need help! Working on flooding issue on 96 chevrolet cab and chasis 7.4

Asked by Nov 05, 2015 at 01:57 PM about the 1996 Chevrolet C/K 2500 Cheyenne Extended Cab LB HD

Question type: Maintenance & Repair

I received truck after owner gave up at other shops. Stated that engine ram
fine as long as alternator was disconnected. Found that another shop had
installed a toggle switch in the single wire plug from alternator to ecm to
charge indicator,making it so the alternator could be switched off. I turned
switch off and engine idles great, takes throttle well, turn switch on and
right away begins to flood and barely idles but still takes throttle well. I
removed belt from alternator and left switch on and found that it runs great.
Seems as long as the alternator is not charging then everything is ok. Turn
switch off, disconnect either of the two alternator wires either plug or bat
connection or remove belt. As long as it is not charging, all is good. Have
had alternator checked and was over charging, they replaced regulator and
charges now at 14.6 but engine still wont run when charging. Odd though
that I can put a battery charger on truck while running with alternator
disconnected and it runns fine, even turned up to!!

2 Answers

Ok guys, this one turned out to be a bad ignition module. I found that the alternator when charging was adding load to the engine. The extra load caused the spark to drop out on all cylinders. I was watching my spark tester and connected the alternator and right away the spark became intermittent. Checked coil with a known good coil and still same. Picked up a module at the salvage and installed it and everything is ok. My coil was loosing its ground signal or trigger from the module under a load. New module now and back on the road

To clarify, It was not actually flooding just the smell of raw gas from the spark being to weak to burn the mixture indicated a flood condition

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