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2005 hemi ram running rough , no codes ,

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 2005 hemi ram running rough , no codes ,

This topic contains 3 replies, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 3 weeks, 4 days ago.

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  • #987035
    Brian Regner
    Brian Regner
    Participant

    Ok I’m out of ideas , I have an 05 hemi ram that had two cylinders low on compression , 5 and 7 . I pulled and rebuilt the motor the compression is now about 170-175 across all cylinders. It’s still running rough. Before the rebuild I tried new copper 570’s , new coils, new wires , and new injectors. Prior to rebuild I had codes for cylinder 5 misfire that one had 50psi and then multiple cylinder misfire. I have pulled the valve covers off to double check my work and verify the cam lift and as well as pushrods are seated properly. Now with it running I can pull the injector wires for cylinders 5 and 6 with no change in the idle speed. This is a non mds motor BTW. I pulled the injector harness to inspect and found no flaws. I set the timing with the crank at 6 and the cam at 12 . I don’t know what else I’m missing. Yes I cleaned the throttle body proir to the rebuild as well. The egr valve pipe is cool to the touch for the first few minutes so I don’t suspect it’s stuck open ?

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  • #987042
    Nightflyr *
    Richard Kirshy
    Participant

    One issue at a time …
    You state:
    “I can pull the injector wires for cylinders 5 and 6 with no change in the idle speed”
    Have you checked the injector wiring using a node light to ensure your getting a signal to trigger the injectors in question?
    Next would be to check the injector flow rate by using a fuel pressure gauge attached to the fuel rail and some type of tester like this …

    To see if indeed all the injectors are flowing equally and at the recommended rate.
    Get through those and see what the results say.

    #987045
    Brian Regner
    Brian Regner
    Participant

    I did a basic pressure check , it was holding steady at 60 psi and I did a noid light test at the same time. All good. I don’t have that flow test unit pictured , I did flush the fuel rail when I replaced the injectors.

    #987046
    Nightflyr *
    Richard Kirshy
    Participant

    You need to confirm injector flow rate is at MFG recommended rate across all injectors.
    Fuel pressure holding at 60PSI only confirms fuel pump / pressure regulator function and non leaking injectors, not injector flow rate.
    Same to same about flushing the fuel rail.
    This need to be confirmed before moving forward with trouble shooting.

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