Q: Engine only runs at 650 or 1300 rpm's, and nothing in between 650 and 1300 or above 1300 rpm's.

asked by on

The truck is harder to start and usually takes two or three tries before the engine will continue to run now that the engine only runs at two speeds.

My car has 116550 miles.
My car has an automatic transmission.

Hi there. First check the air filter on the engine. A dirty air filter will starve a diesel engine and prevent it from running correctly. Then check the fuel / water separator and see if there is a drain valve. Drain off some of the fuel in the filter and re-prime the filter to remove the air from the fuel system. If the filter does not have any drain valve, then I recommend replacing the fuel / water separator and the fuel filter. Also, check to see if your vehicle as a block heater and if it does, make sure that its working. Check the glow plug circuit and see if the glow plugs are staying on to heat up the engine. If the glow plugs are not staying on, then check the glow plug relay. Replace the relay if its not clicking or not staying on very long as the timer has failed. If you need further assistance with your engine not starting, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Engine only runs at 650 or 1300 rpm's, and nothing in between 650 and 1300 or above 1300 rpm's.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Loud tick knock around 1500 to 2500 rpm and a little on startup

Hello, thanks for writing in about your 2006 Dodge Stratus. It can be tough to tell the differences between engine noises sometimes. In general, small parts make smaller noises. Bigger parts make deeper noises. Think drums or cymbals. Lifters...

Q: wiggle steering wheel to start engine ?

Hi there. It is quite possible that the issue you're experiencing is due to an exposed electrical wire that is creating a short inside the steering column, within the ignition switch or possibly the ignition relay. Diagnosing this issue is...

Q: Joe I am having an issue with my 1997 Dodge Ram 2500 5.9L Cummings motor, motor would not start I changed fuel filter it started r

Hi there. It is possible that the fuel filter change may be the cause of your hard to start issue. If the fuel filter is either the wrong size or was installed backwards, it would cause a restriction of diesel...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.