Lew Posted January 19, 2023 Share Posted January 19, 2023 I'm at a loss! I have a 2007 CXN613 that loses boost for some reason. I've replaced turbo, air-to-air, piping to turbo, rebuilt VTG valve. When I start out, I have nearly 40 pounds of boost, then, 10 minutes or 4 hours, no rhyme or reason, it just loses pressure until I pull over and shut it down. After I restart, its good for a short time until it drops again .... Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/ Share on other sites More sharing options...
Freightrain Posted January 19, 2023 Share Posted January 19, 2023 Lack of fuel will cause low boost. Is something cutting that down? My .02 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/#findComment-523178 Share on other sites More sharing options...
Lew Posted January 20, 2023 Author Share Posted January 20, 2023 Fuel appears to be ok. The lightning bole comes on and that kills boost. Lightning bolt has come on or off over the years with no issues but not this time. Quote Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/#findComment-523278 Share on other sites More sharing options...
Onyx610 Posted January 20, 2023 Share Posted January 20, 2023 Any logged codes? Quote Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/#findComment-523280 Share on other sites More sharing options...
Joey Mack Posted January 20, 2023 Share Posted January 20, 2023 Has the boost sensor been replaced? If so, was the correct part number installed? Also, have you replaced the little air filter for the VGT actuator? Quote Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/#findComment-523282 Share on other sites More sharing options...
Lew Posted January 20, 2023 Author Share Posted January 20, 2023 It's not storing any codes and yes I replaced the turbo filter.... Quote Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/#findComment-523287 Share on other sites More sharing options...
fjh Posted January 20, 2023 Share Posted January 20, 2023 9 minutes ago, Lew said: It's not storing any codes and yes I replaced the turbo filter.... Un plug the EGR Valve and see if this changes your situation! This is a test it will throw a constant code but try it! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72336-turbo-boost-failure/#findComment-523288 Share on other sites More sharing options...
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