'07 4.7 Flex Fuel transmission and engine problems
I have a 2WD 4.7 flex fuel automatic tranny. The issue is I have had it into the dealership 4-5 times over the last two years to find out why the transmission erratically shifts and sometimes a HARD shift results in the truck slamming gears and causing the engine to shut off in traffic. This only happens when the air conditioner (or defroster in the winter) is on. Rain, sun, snow or fog, doesn't matter. Typically this happens at highway speed, 55 or higher. The dealer has made sure the tranny is up to date on all firmware, all the electrical checks out, nothing mechanical is wrong either. I have had the battery, battery cables, and alternator all checked and are within specs. I have talked with a couple other guys that have had a similar issue, they told me that a cable was replaced somewhere and all was fine. I have followed the voltage 12+ from battery to fuse block/power distribution block under the hood. I am looking for any help that I can. I've spent a ton of money chasing this issue. Dealerships, auto electrical shops, other mechanics, backyard mechanics, etc - to no satisfaction.
Thanks for any help or assistance!
Last edited by jsskdavis; 07-29-2012 at 03:43 PM.