Engine/Transmission (1998.5 - 2002) Need Help Please!

[hoverlover]

My truck started to run erratic a couple of days ago. I first noticed it @ idle, the tach would drop 50-75rpm them jump up 50-75rpm. At first it was only @ idle but now its @ all rpm's. Fuel pressure is 20-22 @ idle and 15-16 WOT. Any ideas? Thanks!

 

[TIngram]

the tack in my truck will fluctuate alot. took it to the dealer and they say they all do it. it sounds like you have good fuel pressure. might be a sensor or something though. mine does it all the time so it might just be the truck. does the engine change speed or just the tack.

 

[Piston Slapper]

Is it just the tach being erratic or is the motor actually bouncing arround? If it is just the tach, symptomatic of the CPS. Crank Position Sensor, under the starter motor.



Part #

Mopar : 05015488AA $67

Cummins: 4002066 $37

 

[hoverlover]

Thanks!

Yes, the motor fluctuates but you can only hear it at idle. Just called Cummins and got a crank sensor. Will try that first.

 

[powerwagon440]

my tach would jump all around and sometimes not even work at all!! got a new CPS havent had a prob since!!!

 

[fox]

Can you back that fuel pressure down to 15 -16 and try it? I have read the VP44 doesn't like pressure over 16-20.

 

[bmoeller]

Originally posted by fox

Can you back that fuel pressure down to 15 -16 and try it? I have read the VP44 doesn't like pressure over 16-20.

Looking at his sig, he is running a pusher pump.

 

[hoverlover]

Crank Sensor Fixed It !!!

Oo.

 

[Piston Slapper]

You just paid for you TDR subscription!

 

[DHawthorne]

This is after the fact, I know, but I had a engine stumble with my CPS failure. Lost the tach, and water temp gauge when the tach was not working.



Glad you got yours fixed.





Dave