TripleSllc Posted February 24, 2014 Share Posted February 24, 2014 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 Quote Link to comment https://www.bigmacktrucks.com/topic/34804-power-loss-on-rd-688s-mack-e350/ Share on other sites More sharing options...
Challenger Posted February 25, 2014 Share Posted February 25, 2014 Maybe low fuel and or boost pressure? I would hook gauges up and road test. Quote Link to comment https://www.bigmacktrucks.com/topic/34804-power-loss-on-rd-688s-mack-e350/#findComment-234458 Share on other sites More sharing options...
staxx Posted February 25, 2014 Share Posted February 25, 2014 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. Quote Link to comment https://www.bigmacktrucks.com/topic/34804-power-loss-on-rd-688s-mack-e350/#findComment-234466 Share on other sites More sharing options...
TripleSllc Posted February 25, 2014 Author Share Posted February 25, 2014 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. Quote Link to comment https://www.bigmacktrucks.com/topic/34804-power-loss-on-rd-688s-mack-e350/#findComment-234500 Share on other sites More sharing options...
TripleSllc Posted February 25, 2014 Author Share Posted February 25, 2014 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. Quote Link to comment https://www.bigmacktrucks.com/topic/34804-power-loss-on-rd-688s-mack-e350/#findComment-234501 Share on other sites More sharing options...
Challenger Posted February 26, 2014 Share Posted February 26, 2014 The malfunction light should go on and off every time the key is turn on. Find the lightning bolt decal light and remove the dash. The bulb could be burnt out or could've fallen out of the socket. The malfunction light needs be repaired. Quote Link to comment https://www.bigmacktrucks.com/topic/34804-power-loss-on-rd-688s-mack-e350/#findComment-234610 Share on other sites More sharing options...
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