95 7.3 won't rev passed 1200RPM

[JDawg965]

Ok so I have a 95 cc dually 7.3 diesel that starts up and idles fine sounds good. When I put into drive or even in neutral or park it won't rev passed 1200RPM? I just replaced the IPR, CPS 3 times and oil, oil filter, no leaks anywhere IDM also replaced with 2 known good ones? Does anyone know what this could be? Is it something db I overlooking? Thanks for the help


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[BigFuel]

I am rarely speechless around here but this has got me. Can you take and post a video?

[HVAC SuperTech]

Could be the hpop is totally dead, could be throttle pedal position sensor, could be the low pressure pump or the pickup not supplying oil to the hpop . How's the fuel filter? Could also be the fuel pump.

[cncrestoration]

I'm having same problem just got back together today after new heads finally got it started after hour n half cranking won't rev past 1500. Also water coming out back motor between tyranny a.d motor looks like. I'm completely puzzled.

[JDawg965]

Here is a video of my issue, fuel pressure is 50psi at filter hpop seems to be in good order the truck sounds fine at idle just won't do anything tranny fluid is good a new oil is new and good. Check out the video and let me know what you think thanks..

http://i128.photobucket.com/albums/p...98168348E4.mp4


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[BigFuel]

That is SO weird. There is no hesitation, popping, stuttering at all. Just black smoke. The smoke only tells me that it is drastically over fueling with not enough air to support combustion. Have you taken apart the entire intake system to look for a restriction (wife had a rat eat through the air filter where you couldn't see it and made a home inside the intake tube blocking the thing up).

[BigFuel]

Wait, that hiss. Is your EBPV stuck closed? Reach under the turbine output and disconnect the EBPV actuator rod. Pull and wire the Butterfly valve arm toward the turbine. Try again.

[BigFuel]

I'm also noticing by watching to the end that it's time to replace your Vacuum pump and check the lines for cracking.

[JDawg965]

Thanks big fuel, I was feeling under the weather today so I am hoping to take a look tomorrow, I will disconnect the rod under the output of the turbo and see what happens.. Also where is the vacuum pump located and what hoses should I be looking at? Thanks for all the good advice I hope we can figure this out!!!


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[BigFuel]

Right under the A/C compressor. It has a rubber line that goes back to the firewall and feeds your Brake booster and various other things inside the cab. Pull the line off the booster and hook a vacuum gauge to it while the truck is running. What's it read? When you jumped into your truck the brake light was on but after you rev'ed the motor it went out. May also be why your ABS light is on.