solo318 Posted August 30, 2021 Report Share Posted August 30, 2021 I have a 98 vnl with a cummins N14. recently the caution light comes on and the engine seems to "derate" to 1200 RPMs. it will carry on for a little while when I start it up cold, then run fine for the rest of the trip. My digital display is non functioning, so I have no Idea what the light is on for. The oil pressure and temp show good on the gauges, But the oil pressure is swinging up and down on my scan gauge. (never below 30, but it will go up to 45 and back down and cycle there while the engine is cold. I found a crack in the old sensor and have replaced it. I haven't driven it yet, but hope that fixes it. Any other things that would give me a "caution" light and a Derate? Quote Click For Full-Size Image. Link to comment Share on other sites More sharing options...
Wrknrvr Posted August 30, 2021 Report Share Posted August 30, 2021 (edited) Are you talking about the cam sensor. I had one fail a few years ago while on a trip from Arizona to Pennsylvania. It was short on power when we left on the trip. But I was trying to outrun a wind storm. I had one with me so I changed it in Dodge city Kansas. It’s been running great since then. We have Cummins n14 Hope these thoughts help. Vern Edited August 30, 2021 by Wrknrvr Quote Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted August 31, 2021 Report Share Posted August 31, 2021 See if you can get it on a Cummins computer. It's the easiest option without throwing parts at it. Not having your display working sets it back. The display would show a code that you can search. Quote Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
Jaydrvr Posted August 31, 2021 Report Share Posted August 31, 2021 Doesn't your scan gauge give you codes, or is that only on the KR version? If it's derating, it must be throwing a code for the problem. Seems to be the first place to check. Jay Quote Link to comment Share on other sites More sharing options...
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