Engine/Transmission (1998.5 - 2002) Bouncy Tach @ Idle

[tstainton]

I have a '02 3500 HO quad cab and have noticed at idle the tach bounces up and down - not holding at a consistent rpm. Is this an indicator of a problem soon to reveal itself? Also - what is the rumor I hear that the temp sensor should be replaced due to some failures that have occurred and fried the engine??? Thanks in advance... T.

 

[Bob Wagner]

could be a bad cam sensor

 

[CJ Lagos]

My 02 HO 2500 does the same thing.



CJ

 

[andrewkoperdak]

my tachometer has bounced about 30 rpm since the day the stork brought it to me. 20 thousand miles later it is still boucnicg without any ill affects

Andy

 

[Motorhead]

ME too

 

[Turbo Trucker]

Mine is mostly very steady, but sometimes it will bounce, usually after driving for a while.

 

[Floor It]

All the tachs should do it some,its the the way the computer reads the tach signal. Dodge uses a computer that does sample readings,so since there is always variable idle rpm ( no engine idles completly steady) the sample reading reads this at idle and shows this on the tachometer. Hince the boncing of the needle,hope this helps.

 

[A. Brown]

I think they all do it to some degree, I wouldn't change any parts unless it starts acting up real bad.

 

[Tomeygun]

MINE too... .



by hearing the engine and by sight of watching the tach,



when i actually hear the idle change, it scores me that there is something wrong.



hmmmm