chico26 Posted March 18, 2014 Share Posted March 18, 2014 My truck lost power won't go over 1200 rpm. No codes no smoke. Changed crank and cam sensor no change. When it hits 1200rpm it will start to sputter a bit. Any ideas?Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/ Share on other sites More sharing options...
Kyle 537 Posted March 18, 2014 Share Posted March 18, 2014 Any codes on the dash? Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-238006 Share on other sites More sharing options...
chico26 Posted March 18, 2014 Author Share Posted March 18, 2014 No codes. I found the problem. The main harness had about 4spots that were rubbed and exposed. Repaired the wires and truck is runningSent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-238007 Share on other sites More sharing options...
Kyle 537 Posted March 18, 2014 Share Posted March 18, 2014 Good stuff. Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-238015 Share on other sites More sharing options...
Challenger Posted March 18, 2014 Share Posted March 18, 2014 Good job. Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-238035 Share on other sites More sharing options...
chico26 Posted March 25, 2014 Author Share Posted March 25, 2014 Ok we'll the truck started doing the same thing so I replaces the engine harness and it's working now. But when I was checking the harness I disconnected it with the engine running. The truck shut off naturally but now the I can't start it with the ignition I have to jump the solenoid. Any ideas?Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-239153 Share on other sites More sharing options...
Kyle 537 Posted March 25, 2014 Share Posted March 25, 2014 Have you checked fuse? Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-239165 Share on other sites More sharing options...
chico26 Posted March 25, 2014 Author Share Posted March 25, 2014 Yea checked all fuses replaced the relay. Maybe the switch decided to go out. Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/35084-2008-mr688-wont-go-over-1200-rpm/#findComment-239192 Share on other sites More sharing options...
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