Question about 1999 Dodge Ram

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Have a 99 Dodge 360 1500 pickup. Truck started dropping rpms intermittently. Now when you do get it started won't go over 1500 rpms and has a deep woofing sound to it. Compression is good. Cleaned the fuel tank and replaced the pump regulator assembly so I know the fuel is fresh. When it is running the pressure of the fuel at the intake manifold jumps from 10 to 60 psi and the needle is going nuts before and after pump/regulator change.

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  • aaronk12 Nov 12, 2010

    replaced both did not work

  • aaronk12 Nov 12, 2010

    I just put a new cap and rotor on and that didn't help. I'm wondering if it could of jumped timing? When it sits for awhile it'll start then die right away now. If I pump the gas peddle it'll do the same thing. It only has 87000 miles on it I don't know if a chain would jump that soon and why would the fuel pressure be so erractic?

  • aaronk12 Nov 15, 2010

    No I did not change the regulator on the throttle body. I did not know it had one. I'm working from a Chilton and it's not very detailed. I changed the fuel pump that has the filter pressure regulator built in on the fuel tank. I'll try the one on the throttle body when I get back in town. Thankyou I was at a loss on what to try next.



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Hello! The problem is being caused by one of two sensors...I'll list them in order of probability...
# 1 is the Manifold Absolute Pressure (MAP) sensor...# 2 is the Throttle Positioning Sensor (TPS)...
Both can be rested before you spend any money...Question is do you have a multimeter and a little experience using it? if you do, I'll send the test procedure...Just let me know...Both devices are bolted to the throttle body and are easy to replace...See pictures below...Send a comment...



Have a 99 Dodge 360 1500 pickup. Truck started - saailer_2.jpg


I’m happy to help further over the phone at

Posted on Nov 07, 2010

  • David Burbee
    David Burbee Nov 12, 2010

    Hello! When you say you have changed the Pump/Regulator Assembly, do you mean the Fuel Injection Pressure Regulator and the Pump? This may be my stumbling block...send a comment...saailer

    Injector Pressure Regulator



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