ron44094 Posted August 8, 2013 Share Posted August 8, 2013 I have an 04 Vision with an AC400 and sometimes it has low or no power. I notice that sometimes the intake manifold pressure gauge is close the zero but when the engine is running well it is around 30 to 35. Also, my lighting bolt engine light comes on for a short time as well. Any ideas? Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/32265-intermittent-low-power-on-04-vision-ac400/ Share on other sites More sharing options...
countryboy5487 Posted August 12, 2013 Share Posted August 12, 2013 Does the low power happen at any certin time ie pulling hills accelerating? Or is it totally random? If your boost gauge goes to almost zero the problim is mostly in the intake system. But with it beeing not constalt low power its not a blowed/broke boot i would start at your waste gate on the turbo sence i beleave thats the only place to just randomally loose boost pressure. What do you have to do to get power back? Or does it fix its self? Quote Link to comment https://www.bigmacktrucks.com/topic/32265-intermittent-low-power-on-04-vision-ac400/#findComment-199456 Share on other sites More sharing options...
staxx Posted August 12, 2013 Share Posted August 12, 2013 Most likely the VGT pins at the turbo are loose , replace pins or try to tighten up pins , also need to check and see what codes you are getting to confirm. Quote Link to comment https://www.bigmacktrucks.com/topic/32265-intermittent-low-power-on-04-vision-ac400/#findComment-199466 Share on other sites More sharing options...
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