Possible TC issues??? - Ford Powerstroke Diesel Forum
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Old 04-25-2012, 05:12 AM
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Possible TC issues???

Been having a couple of issue for about a month now and one seems to be getting worse. First, when coasting from highway speeds and at 40 MPH when the TC unlocks my engine's RPMs fluctuate down then back up and then levels out at idle. Seems to be not a whole lot of movement, but is definitely noticeable to the ear. I would say it first drops down to about 600rpm, bounces back up to 850'ish and then levels out at the usual 750. Now today I noticed it kind of spudder a little when it happened (twice).

I do not have a blinking OD light, but there is a SES that comes on when kind of lugging the truck like when you first take off from a stop or cruising at lower RPMs. I have had the codes read and have an IDM code that is more than likely due to a chaffed wire somewhere.

I just dropped the pan and changed the filter about 300 miles ago but this was going on before this.

The second issue is when accelerating up to highway speeds it seems like the TC locks up at the same time as the transmission is shifting at about 40mph resulting in an odd feeling shift. I have PHP tunes on as 98% of the time ride around in the 80DD tune. I can vary my pedal when accelerating and get the 2 events to happens separately and everything feels fine, but if accelerating and not thinking about it is when I feel it most. Thank you in advance for any help given.
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Old 04-25-2012, 06:50 AM
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The more I sit back and think about it, the more inclined I am to think this may be related to my SES vs. the transmission. A sudden drop in RPMs (like the TC unlocking) causes a change in voltage (or rather the fire event signal) from the IDM and if I do in fact have a short or bad IDM the engine may stumble a bit. I am just think out loud here and may still have a TC issue, but guess it's time to break out the multi-meter and start doing pin-out checks on the IDM to UVCHs. Still welcome to any input as well especially if anyone else has had the engine symptoms mine is having. Thanks!
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