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About 2 weeks ago I was driving and I heard my truck rev up. There was no shudder or hard shift and the the rpms jumped up from 1400 to 2k then back down in a matter of seconds. It jumps up and down like this no matter what. Down hill, uphill, or flat ground it does this around 50mph. Also sometimes around 2k to 3k rpm it feels like there's no power almost like the converter is not locking all the way. 93 f-150 5.8l E4OD. Any ideas would be appreciated and yes I have checked the transmission fluid
Could be a failing MLPS or TPS or ….? Are there any KOEO fault codes? Whatever you do don’t start throwing parts at it. You must do some diagnostic testing first.
Could be a failing MLPS or TPS or ….? Are there any KOEO fault codes? Whatever you do don’t start throwing parts at it. You must do some diagnostic testing first.
The check engine light is not on but I've been told that doesn't matter sometimes. It's been really wet lately too could water damage these parts?
Not terrible but not fun either. I did that on the ‘94. There isn’t a whole lot of room or slack to work with.
You did it the same wrong way I first did then haha. The next time I had to do this, on my other truck, I unhooked the connector on the solenoid pack, and this allows you to bring the whole wiring harness down, way down on the drivers side, so you have all the room in the world to work on re-pinning the mlps/range sensor connector. I shook my head in remembrance in how much I suffered doing it the first time, not just bringing the whole harness down. It was like a whole different job, all for the couple extra mins it takes. It took like 1/10 the time overall.
I wrote that for the IDI diesel section, but same general info. This is the main communication connector between the pcm and trans, so if the wires short out, and or have corroded pins, your trans will act exactly as you describe. You should get associated codes however...........but this is good preventive maintenance; something good to do every 5 years or so anyway.
If anyone reads that with a '95+ truck, just remember if you need a repair harness connector, you need the '95-'97 plug.
I've seen this happen when the TRS (also called the MLPS - located on the driver's side of the transmission) starts to fail. It won't set a code for this type of failure, so I recommend replacing the TRS with one of the new style parts.
So after replacing my check engine light bulb because for some reason the whole socket was gone I ran the KOER test and it threw 411,412,121,538, and 632 codes. The KOEO threw a 112 but as well as 654,321,233,254,263,712,673,462. 112 is the only one I could find in the code list and the rest seem not to exist. I have all these codes written twice so surely I didn't count them wrong twice in a row. With what I have it looks to me I have a bad throttle position sensor but what else could it possibly be?
Ignore the KOER codes since you are supposed to perform the engine off test and repair any fault codes from that test before moving on to the engine running test. You have more than the TPS to worry about with all those codes. Were those KOEO codes all active, a combination of active and stored or all stored?
