Community Forums

royleesmith · 03-25-2023, 02:32 PM

Engine dies while idling or 1200 rpm’s.
Replaced solenoid that ties batteries together while in motion. Expect a bad oil pressure switch and due to difficulty in replacing the oil pressure switch, on the engine, I decided to just bypass the switch, to ground, while traveling.
Here’s my problem, while bypassed to ground or using the bypass switch on the console, the engine dies after about 20-30 seconds. I went thru the expense of replacing the solenoid, which was bad, and I’m no better than when I started.
Do my Country Coach buddies have any ideas? Could the oil pressure switch still kill the engine while I have the solenoid grounded?
If I don’t have the solenoid grounded or I do not press the battery booster switch
the engine Does Not die. Oil pressure gauge shows 60 psi while idling (cold) The fuel solenoid does open when this happens. Something is telling the fuel solenoid to open.
Thanks,
Roy
Country Coach Allure 1998 30195

wolfe10 · 03-25-2023, 02:42 PM

Please tell us what engine you have.

royleesmith · 03-26-2023, 06:18 AM

Cummins 8.3L mechanical engine.

Smitty77 · 03-26-2023, 10:03 AM

I don't have any knowledge on that era engine. But if no one chimes in here with some suggestions, ask the Moderator to move it over to the Power Garage Cummins section - a wider audience... And hopefully Wolfe10 will see your engine update, as the man does know diesel's

!

I'll add that while not specific to your engine, many 'What's going on?' issues, can sometimes be traced down to a faulty ground connection in the loop(?).

Best of luck to you,
Smitty

wolfe10 · 03-26-2023, 10:09 AM

With the mechanical C engine, have you manually tied "open" the fuel shutoff solenoid?

These do fail and easy to wire in the open position to keep you going and/or diagnose the issue.

royleesmith · 03-26-2023, 07:15 PM

The fuel stop solenoid works normally except while tying the Coach and chassis batteries together. When I do this, the solenoid will drop out in app. 30 seconds.

hkuhnert · 03-28-2023, 12:09 PM

There are two oil pressure sending units on the ISC, one for the console gauge and one for the ECM. If you have a way to see the oil pressure in the ECM via a reader (I use scangauge D) you will be able to tell if this is causing your issue.