Weird overdrive! - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 02-20-2013, 10:01 PM Thread Starter
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Weird overdrive!

I have an early 99 that is just acting weird.

At WOT, it shifts great.

Normal driving to mild driving, also shifts great, until overdrive. When it drops into O/D it does fine, then once you accelerate another 10ish km/h it will jump in and out of O/D. 1700rpm to 2100 to 1700 to 2100 and continue until you either let off, or give it more.

I have a DP tuner, does this on all tunes except Tow, which I find interesting.

Also might be temp related, I have a temp gauge on order. I find it happens more if I've been cruising on the highway for a period of time, then have to do a stop and start in one of those tiny towns and go back to highway speed. If I drive around in town a while, then go on the highway it doesn't do it, regardless of tune.

Also the colder it is the more this happens I think ( I'm talking -20C and below).

Never noticed a flashing OD light, even purposely made it happen to watch for it. I'm going to pull the tuner tomorrow and go for a drive.
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post #2 of 2 Old 03-01-2013, 05:46 AM
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howd it work with chip removed? Sounds like a TQ problem

99.5 x-cab 7.3l, 6spd, 161k miles.....
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