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Matt
Matt, Engineer
Category: Dodge
Satisfied Customers: 20611
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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2001 dodge diesel when you first start it and drive it acts

Customer Question

2001 dodge diesel when you first start it and drive it acts like it is running on 4 cyllinders and all of a sudden it takes off and runs good all day its been doing this for 3 years
JA: How old is the engine? And when was it last serviced?
Customer: it has 120000 on it and gets serviced regular 2001 3500 dodge
JA: Are you fixing your B3500 yourself? What have you tried so far?
Customer: new fuel pump I dont know what else to try
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 2 months ago.
Category: Dodge
Expert:  Matt replied 2 months ago.

Hello

1st consider changing the fuel filter as if this partially blocked this will reduce pressure at the main pump

If this is OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked