nidfd112 Posted January 11, 2018 Share Posted January 11, 2018 Have an MP7 in a GU713 mixer that has a stutter at around 1400 RPM's as you hit a hill. You will drive along and all of a sudden it is like you threw an anchor out and starts to bog. If you accelerate hard you can hear the turbo spool and it will eventually come out of it. Drove it today with cruise set at 1400 RPM's and in 6th gear and it would do it all the way up the hill. When we got back to shop idled truck up to 1200 and it just surges about 200 Rpm's. Nothing comes up on computer when its doing it and no stored or active codes. Did a cutout test on injectors while it was parked and engine quits surging until turning injector back on. Anyone have any ideas where I should start. Quote Link to comment https://www.bigmacktrucks.com/topic/52192-mp7-with-surge/ Share on other sites More sharing options...
Mackpro Posted January 11, 2018 Share Posted January 11, 2018 Check turbo motor effort when hot. And do open and closed test on the turbo. Make sure they go to 0% to 100%. We have seen sticking turbo vains cause weird issuses Quote Link to comment https://www.bigmacktrucks.com/topic/52192-mp7-with-surge/#findComment-389486 Share on other sites More sharing options...
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