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M1123A2 engine noise while traveling on highway.
It did sound like a 120V sewing machine running on 240V -
M1123A2 engine noise while traveling on highway.
I guess that answers the question about if you were in limp mode, you might want to step back and do a thorough inspection as honestly you should have put eyes on that before you went for a drive. -
M1123A2 engine noise while traveling on highway.
Look at the picture in post #20 and match it to the schematic in post 22, you probably cannot do it wrong as you have 2 male and 2 female connectors and it looks like it really does not matter what polarity the coil and contacts are connected. Probably the breaker also -
M1123A2 engine noise while traveling on highway.
It should be quite obvious if it is shifting or not, when in limp mode it would seem to bog a little on takeoff (starting in second instead of 1st) and then it does not shift, thing makes too much noise not to notice when it shifts. -
M1123A2 engine noise while traveling on highway.
Do you have a lit trans light when you turn the ignition to run? If not it is likely your TCM is not getting any power. -
M1123A2 engine noise while traveling on highway.
Also is does not sound like you are "coasting" the only time you coast in a HMMWV is occasionally downhill. Could you mean while cruising? -
M1123A2 engine noise while traveling on highway.
I think you may be running in limp mode, again is the transmission shifting? no real difference in the turbo, horsepower difference is very marginal. -
M1123A2 engine noise while traveling on highway.
That is the fan kicking in towards the end of the video if that is what you are talking about, it does also seem to be running quite a few RPMs for 50MPH. Is it shifting or are you running along in 2nd gear?