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M1123A2 engine noise while traveling on highway.

C

Creed

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Hey guys. Drive my hmmwv on highway for first time. I got an astounding 49 mph. While coasting my engine gets really loud for a while, dies down and then starts again. Is that normal. Its seems a fan or RPM just gets really high and can hardly hear anything in the cabin. I will post a video. Hopefully you can hear the difference.
 
C

Creed

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Creed said:
Hey guys. Drive my hmmwv on highway for first time. I got an astounding 49 mph. While coasting my engine gets really loud for a while, dies down and then starts again. Is that normal. Its seems a fan or RPM just gets really high and can hardly hear anything in the cabin. I will post a video. Hopefully you can hear the difference.
Click to expand...
youtube.com

hmmwv engine noise while coasting on highway

youtube.com youtube.com
Added video. Let me know what you think. Thanks.
 
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Milcommoguy

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Mogman

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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?
 
Mogman

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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.
 
Mogman

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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?
 
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Creed

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Creed said:
Also 49 mph is horrible. I was thinking of this turbo vs. a swap. Lot less money. What do you think?
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Mogman said:
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?
Click to expand...
Have in overdrive and H.
 

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Coug

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if the max you can do is 49mph then either you're stuck in limp mode (2nd gear) or you have a power output issue.


Does it feel like it's shifting gears at all?
 
MarkM

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After listening to the video it sounds like you are only in 2nd gear and the fan should stay on like 2 min. Try shifting the gears manually and see if you are shifting properly.

Mark
 
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Creed

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Mogman said:
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?
Click to expand...
I don't feel it shifting. Is there anyway to know for sure?
 
Mogman

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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.
 
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