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took the truck out this morning (1997 12v 5.9 L) felt like I had a load too heavy to pull with truck empty. once I got moving every thing seemed normal. She did it all day. Feel like I'm startin' out in 3rd gear, or with a really heavy load. doesn't do it in reverse, 4h, 4l, but does do it in 1st, 2nd, D, and OD. I'm scared. I feed my kids with this truck.
Sounds like your in "limp mode". Go ahead and try the filter and prefilter, but since you say it runs fine once you get up to speed, then I would look at trans. Next time you drive truck, count the number of shifts. You should have 4 definite changes in RPM's as you get up to speed. If shifts are missing as you describe, first, try checking for codes with an OBDII scan tool. If codes are present they will give you a direction to go. Most times if you are in limp mode they will be present since the computer controls trans. Also, check the simple things first like fluid level. Always check fluid with engine running at idle, parking brake engaged, trans in neutral and up to temp. What color and smell is fluid? If not bright red and smells burnt, then bad things could have already happened. Limp mode is caused by governer pressure signal that is sent to PCM. It can be caused by low or high governer pressures detected, bad signal altogether that is caused by bad sensor, solenoid or wiring. You may also need a pressure check on trans to verify whether a sensor, solenoid or trans itself is bad.
I took her out again, definitely not shifting. I do get lock up at about 40mph, and she does manually shift in and out of OD. I started in 1st and it was no different then starting in Drive, then I tried it again, and she started out normal, manually shifted into second, then drive and it was fine. I stopped and started again the same way and it was bad again. Definitely seems like a sensor or wiring.
Can any one show me a picture of the governor sensor. I got a good look at what I think is the governor sensor and it was loose, a little fluid was seeping there, and the harness does not seem like it is plugged in real tightly. My dad has an OBDII scan tool but it is a real cheap one and did not read any codes. I won't have access to a good one 'til Monday.
The governer sensor is on the valve body inside of the trans. There is the governer solenoid and sensor located together on the front of valve body on the passenger corner. Only way to see it is with pan off trans. Best way to verify that solenoid and/or sensor is bad is to get hydraulic pressures checked. This way you will know what pressure actually is and if PCM is getting a bad signal. PCM could actually be getting a good signal and you have low hydraulic pressure and PCM is trying to save what is left of your trans.
what is the part I amlooking at on the driver side which I mentioned above? It has three prongs, and the harness plugs in there, and then runs wires further back on the trans. It was loose, and the harness will not seat properly when I tried to plug it back in after tightening the mystery sensor I am referring to. I have an ATS trans if that helps. I bought the truck with it, and obviously don't know much, let alone the difference between an ATS or stock trans.
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