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- - digital speedo, engine power loss (https://www.classadrivers.com/forum/truck-maintenance/23529-digital-speedo-engine-power-loss.html)

pumperdog

01-03-2007 03:24 PM

digital speedo, engine power loss

I have an 05 cab over w/ a 320 hp cummins.
The digital speedo that gives you trip miles hrs and rd. mi. and needle speed quit working.
There is a sener on top of tranny can anyone tell me how to test this system before I spend 250.00 for a new speedo?
Also when I turn key on and wait for gauges to set before I start truck sometimes the ceck eng. lite comes on sometimes not the dealer couldnt find a code.
Once in a while when gearin up the motor wont let me go over 30 mph in sixth gear, I have to pull over and turn off truck to reset before continuing.
Any help would be great thanks

bob h

01-03-2007 10:43 PM

help us help you;

cab over what?

pumperdog

01-04-2007 12:40 PM

sorry folks cabover

Its a caboo
thanks in advance

bob h

01-04-2007 12:49 PM

Re: sorry folks cabover

Quote:

Originally Posted by pumperdog

Its a caboo
thanks in advance

the intermittent loss of engine light makes this problem pretty obvious...

...thanks for letting us know make/model of truck

happy trails!

Mackman

01-05-2007 11:47 PM

Kranky

01-06-2007 01:49 AM

http://www.classadrivers.com/phpBB2/...=223838#223838

bob h

01-07-2007 08:00 PM

Quote:

Originally Posted by Splitshifter

http://www.classadrivers.com/phpBB2/viewtopic.php?p=223838#223838

Kranky

01-08-2007 12:04 PM

Quote:

Originally Posted by bob h

Quote:

Originally Posted by Splitshifter

http://www.classadrivers.com/phpBB2/viewtopic.php?p=223838#223838

This seems to be the same basic situation as described in the post in the link, but here is my comment copied & pasted:

Quote:

Had that happen a few years ago on a Mack.

Speed sensor on trans output shaft failed. Speedo registered zero MPH, engine was totally devoid of power.

I would assume that without a MPH signal, the ECM thinks the truck isn't going anywhere, and wont allow the engine to receive full fuel.

Replaced the speed sensor and all was well.

bob h

01-08-2007 12:36 PM

Quote:

Originally Posted by Splitshifter

Quote:

Originally Posted by bob h

Quote:

Originally Posted by Splitshifter

http://www.classadrivers.com/phpBB2/viewtopic.php?p=223838#223838

This seems to be the same basic situation as described in the post in the link, but here is my comment copied & pasted:

Quote:

YES, i realized that later on, sorry for the confusion (my confusion ;0)

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