RPM gauge drop then return - Diesel Bombers

24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps
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Old 12-30-2011, 05:23 PM
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Join Date: Dec 2011
Posts: 2
Default RPM gauge drop then return

While im driving. The RPM gauge will drop for about 15 min and return. Also when I shut the truck off. Somtimes it will not start back up, just turn over. Again I have to wait 15 min or so and then it will start
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Old 12-30-2011, 06:19 PM
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Diesel Wrench
Join Date: Jun 2011
Location: New England
Posts: 666

Sounds like crank pos. sensor, but scan for codes or do key trick, cam sensor has same symptom
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Old 12-30-2011, 07:35 PM
Diesel Fan
Join Date: Dec 2011
Location: moneta va
Posts: 34

2000 models have a cam and a crank sensor. my 2000 reg. cab did the same thing and it turned out to be crank sensor. the ecm on 2000 models uses the crank sensor as the primary sensor for timing and the cam for back-up.
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