Diesel RV Club, an FMCA Chapter

Ask Dave => Hey Dave, I've Got a Problem => Topic started by: Wbwimer on July 20, 2020, 07:40:15 AM

Title: Erratic oil pressure and turbo pressure
Post by: Wbwimer on July 20, 2020, 07:40:15 AM
On my 2016 Freghtliner with an ISL 15 I am having an intermittent problem. When it happens I lose power and the engine oil pressure drops to around 25psi and the turbo pressure drops to 0 psi. Both of these pressures are erratic and as they return to normal power returns. I have gotten a malfunction light and a couple of different codes. One of the codes is low or erratic power to instruments.

Any ideas?
Title: Re: Erratic oil pressure and turbo pressure
Post by: trekker01 on July 20, 2020, 10:09:25 AM
Dave will have more tech ideas than I have, but is your battery voltage also fluctuating along with the oil pressure and turbo boost?  Possible loose/poor battery connections on the chassis batteries?  Power connection to the ECM?  Bad grounds?  Time to replace batteries? 
Title: Re: Erratic oil pressure and turbo pressure
Post by: David.e.atherton on July 20, 2020, 04:34:15 PM
Wbwimer, after our phone call on your 2016 Cummins engine problem and the Insite event
code of 723. The following breakout of the 723 code crankshaft position sensor leads to a
interment ground or bad sensor. Myself would suggest going and troubleshoot the ground,
crankshaft sensor, and the computer data cable going from rear of engine to front key switch.
One thing I have found with todays electronic engines ( loose or dirty ground connections are very important and overlooked.) Ask Dave, Dave Atherton Retired Cat Mechanic