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Old 08-09-2010, 11:57 AM
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rpm rev up

I have a 1990 f250 7.3 idi with an e4od trans in it and every time I am just cruising at 40 to 60 mph the rpms rev up and down until i give it more gas or let off the peddle. I work as an advisor at the Ford dealership hear in town and one of the old time techs said it might be the fipple sensor, so we tested it and that was not it... Any ideas on what it might be?
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Old 08-09-2010, 08:05 PM
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FIPL-Fuel Injection Pump Lever

What is happening most likely is your torque converter (TC) is locking and unlocking at speed. It only happens above 40 because thats when its on.

Some courses of action would be to ensure that the grounds in your tail lights are connected and ensure that your interior light and cargo light are grounded properly. This may sound funny but these transmissions are fairly picky.

Another course of action would be to ensure all the connection on the transmission are seated fully and not corroded.

Hopes this helps. DO NOT go and get your TC replaced. It is most likely something else that is causing this. You may need a TC but fix the current problem first and then have it replaced. I made that $700 mistake once.....

I ended up wiring a switch that grounded out the curcuit and kept the TC locked while at speed. Not the preferred method but it worked.

Thad
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Old 08-10-2010, 04:27 AM
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Thanks Thad... Yeah I noticed when it started doing that is when my trailer brake setup quit working and my passenger side brake light quit working, the turn signal and running light still work so I know its a wire issue because the turn runs off the brake filament. There is also a TSB on a connection near the trans that is well known for getting moisture in it and corroding causing similar situations I am having... Electrical!!! Yippee.
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Old 08-10-2010, 08:10 PM
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Well it sounds like you and a multi meter are going to spending quite a bit of time together! HAve fun and dont get too frustrated with her!

Thad
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Old 08-11-2010, 06:12 AM
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Yeah lots of fun. Glad I have the week off for vacation.
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Old 12-02-2011, 02:20 PM
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Question RPM up and down

I know it's been awhile since you guys posted. My 1990 F350 7.3 duly 175,000 miles just started doing this same thing. Driving me nuts. My Trailer brake controler has started to act up also. Can you tell me what you found on the problem with yours. That's my truck with a little snow in Virginia Beach, VA
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