Buddy_M Posted November 27, 2008 Share Posted November 27, 2008 Well, first off I hope everyone has a happy Thanksgiving tomorrow. And secondly I have a truck that came in late with a weird issue of an occasional engine stutter. Its a 1999 F350 manual trans, Just had enough time to hook up the scan tool and check codes and watch a few pids and when it stutters, the VREF will jump to about 65V, haven't verified the voltage with a scope yet tho, and the ICPV and RPM signals will either drop to zero or max out when the VREF jumps. I just haven't seen a truck do this yet and wondering if anyone else has come across this or something similar. A quick exam of the harness doesn't show any visual problems, and I am leaning towards either a harness issue, or don't know if the IDM can be having problems inside sending out stray voltage. Any ideas would be appreciated, and i'll keep updating when I get back to working on that truck, got a few others that got bumped ahead in the mean time. Buddy Quote Link to comment Share on other sites More sharing options...
Steve Mutter Posted November 27, 2008 Share Posted November 27, 2008 I had a truck that had a wire chafe on the left valve just after the big conector,it would run rough every now and then,it's worth a look Quote Link to comment Share on other sites More sharing options...
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