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power loss on rd 688s mack e350


TripleSllc
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Hey guys I'm in need of some help I have a 99 mack e350 I believe but will post vin also its a rd688s vin 11m2p267c045997truck runs fine on level ground or down hill but when it needs power it falls on its face it seems to be down in power to around 60% the mechanic said his machine says engine position sensor erratic out of range. One fuel filter is running full and other is running around 3/4 full also has new filters as well as air filter also speedometer has acted up a few times which I've cleaned the sensor re adjusted and seems to be fine also I've cleaned cam and crank sensors. This is all the information I can think of right now. Thanks guys

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Is the malfunction lite coming on ? The engine postion sensor will cause low power..Check the basics lke Challenger says also check your turbo for damage . Have seen a lot of stuff cause low power over the years keep it simple first could be as easy as a failed muffler.

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Ok after jogging my memory I did run it without a muffler and no change we will be checking fuel pressure this weekend we have yet to check boost pressure although it's expanding the boost tubes also have inspected the turbo and it doesn't seem to have more then normal play or wear.

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Also I have no light on in the dash but I don't believe it's ever worked on the truck and I can't put my hand in the engine position sensor would that be the crank or cam sensor also after running it to get my mechanic to scan it on the way back to the shop it completely dead petaled on me for a split second like I took my foot off the gas pedal.

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