rpm gauge will drop down to zero

2001 DODGE RAM
145,000 MILES
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ADOLFOCHACON
  • MEMBER
  • 2 POSTS
Sometimes when my truck is idling the rpm gauge will drop down to zero and the engine bogs. This also happens while driving in city where i have to constanly shift gears and only gives out about half of power . This lasts maybe 2- 5 minutes.

5.9 cummins
6 speed
All lights in truck dimmer
loss of power especially when towing
Jan 5, 2012 at 6:26 PM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,106 POSTS
Have it scanned for codes.
Jan 5, 2012 at 7:36 PM
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ADOLFOCHACON
  • MEMBER
  • 2 POSTS
I did and it gave me a bunch including that the timing was wrong. If it was off wouldnt it do that all the time? I had to drive it about 18 hours from pennsylvania to texas and it was fine at normal highway speed but getting on the highway was when it happened
Jan 5, 2012 at 7:43 PM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,106 POSTS
Not necessarily. A vacuum leak would only have affect at idle.
A large number of codes usually means a connector issue or a PCM issue.
Jan 5, 2012 at 8:06 PM
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