Stuck roadside again

Topic: Stuck roadside again (Read 1455 times) previous topic - next topic

Stuck roadside again

May 05, 2022, 12:00:25 pm

We drove our '98 U295 (Cummins C8.3 325hp) two days ago down to a resort 60 miles away from home. No issues. We started driving back home this morning and 10 miles down the road started having power issues. We could not accelerate from the red light. 10mph max got us into a big grocery store parking lot and we sit here now trying to diagnose the problem. We had a problem with similar symptoms 9 months ago, which centered around the King Controls system. Before we get into that I want to start with this first question. Sitting still in the parking lot, brake on and transmission in neutral, it idles at 6,250 rpm. Pushing the accelerator all the way to the floor I only get 1,400 rpm's. Should we get more than that?

Re: Stuck roadside again

Reply #1 – May 05, 2022, 12:04:21 pm

Maybe. Depends on how the throttle request is handled by your ECU . I would think that over 2000 should happen but I dont know how your ECU works or it's inputs.

Re: Stuck roadside again

Reply #2 – May 05, 2022, 12:06:09 pm

Assume you means idles at 625 RPM (which is a little low)!

If you suspect a throttle issue, just open the back and manually throttle up-- pretty easy to verify.

And, if the throttle is working as it should, remove the primary fuel filter and drain it into a glass jar to see if there are contamination issues. Replace with new filters (primary and secondary).

Re: Stuck roadside again

Reply #3 – May 05, 2022, 12:10:40 pm

Update: I didn't pull the wiring connectors to the King Controls apart, which is where the problem was 9 months ago, but I did just squeeze them all real hard and that seems to maybe have resolved the situation, at least temporarily. Think we're going to get back on the road and see what happens.

Re: Stuck roadside again

Reply #4 – May 05, 2022, 12:15:51 pm

Check to see if King throttle control is opening to full throttle. check with one person depressing throttle pedal and other visually watching cable to fuel injection pump.

Or sometimes fuel shut off solenoid is not opening all the way.

Re: Stuck roadside again

Reply #5 – May 05, 2022, 12:38:48 pm

Should also be 2 return springs on the throttle area,a common failure as they wear out where they hook on.

Re: Stuck roadside again

Reply #6 – May 05, 2022, 12:46:30 pm

idle should be around 800.
check fuel shut off solenoid

Re: Stuck roadside again

Reply #7 – May 05, 2022, 01:12:47 pm

1)Cable tie fuel shutoff solenoid in full up position. 2)Make sure brake lights are not stuck open or all bulbs burned out.

Re: Stuck roadside again

Reply #8 – May 05, 2022, 02:15:46 pm

Just a guess, but fuel filter??
Jim

2002 U320

Re: Stuck roadside again

Reply #9 – May 05, 2022, 03:14:40 pm

OP Update: Only made it another mile down the road before it happened again. I went and jiggled/squeezed the wire connectors again and the problem went away, so I know it's there. Before starting out this time I pulled apart all four of the connectors (14 wires in all going into the King Controls box), cleaned them as best I could on the side of the road with Q-tips, and reconnected. Made it the 40 miles home with no issues. Not sure of the best way to ensure this doesn't happen again.

Re: Stuck roadside again

Reply #10 – May 05, 2022, 03:21:06 pm

Are the connections coated well with dielectric?

Re: Stuck roadside again

Reply #11 – May 05, 2022, 03:58:27 pm

Sometimes the connections are worn out so they need to be replaced or you could throw
the connector away and connect them permanently. Sometime contact cleaner will fix it.

Re: Stuck roadside again

Reply #12 – May 05, 2022, 04:31:05 pm

If it were me, I'd consider cutting them all and putting an inline connector there. Maybe something like: Amazon.com: WMYCONGCONG 5 Kits 16 Pin Way Waterproof Electrical Connector...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: Stuck roadside again

Reply #13 – May 05, 2022, 05:07:37 pm

Quote from: Bob & Sue – May 05, 2022, 03:21:06 pm

Are the connections coated well with dielectric?

Yes I did contact cleaner and then dielectric the first time I had this problem.

Re: Stuck roadside again

Reply #14 – May 05, 2022, 05:09:37 pm

Quote from: WS6_Keith – May 05, 2022, 04:31:05 pm

If it were me, I'd consider cutting them all and putting an inline connector there. Maybe something like: Amazon.com: WMYCONGCONG 5 Kits 16 Pin Way Waterproof Electrical Connector...

That would do it, wouldn't it. Replace 4 separate connectors with just one.

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: Stuck roadside again

Reply #15 – May 05, 2022, 07:48:06 pm

Quote from: Bob & Sue – May 05, 2022, 03:21:06 pm

Are the connections coated well with dielectric?

Common knowledge and be a dangerous thing.

di·e·lec·tric
/ˌdīəˈlektrik/

adjective: dielectric

having the property of transmitting electric force without conduction; insulating.

noun
noun: dielectric; plural noun: dielectrics

a medium or substance that transmits electric force without conduction; an insulator.

Smearing stuff on connectors to prevent corrosion is an undertaking not to be taken lightly.

Clean the connectors with the appropriate Caig product and be certain that all are making good electrical contact.

Home | CAIG

This is the can that doesn't leak after first use:

CAIG D5S-6-LMH DeoxIT Spray 5 oz. Original Can

Re: Stuck roadside again

Reply #16 – May 05, 2022, 10:20:36 pm

There used to be a similar product years ago called blue stuff,no longer made.

Re: Stuck roadside again

Reply #17 – May 05, 2022, 10:31:48 pm

Quote from: Dan & Annie – May 05, 2022, 05:07:37 pm

Yes I did contact cleaner and then dielectric the first time I had this problem.

If you have prior it will return, when, probably when it the biggest pain. The pins and sockets have worn or are not being held together with internal resistance. Regardless of what you change to make sure all wiring is environmentally protected in some manner. Have you tried physically holding connectors tight with a external tyrap?
Scott

Re: Stuck roadside again

Reply #18 – May 06, 2022, 06:55:47 am

Quote from: John44 – May 05, 2022, 10:20:36 pm

There used to be a similar product years ago called blue stuff,no longer made.

You can watch the Caig DeOxit dissolve corrosion. It looks as though the corrosion is melting away.
What doesn't make sense is cleaning the pins and sockets of a connector them smearing an insulating grease over the connectors.

Re: Stuck roadside again

Reply #19 – May 06, 2022, 06:56:25 am

Quote from: dsd – May 05, 2022, 10:31:48 pm

If you have prior it will return, when, probably when it the biggest pain. The pins and sockets have worn or are not being held together with internal resistance. Regardless of what you change to make sure all wiring is environmentally protected in some manner. Have you tried physically holding connectors tight with a external tyrap?
Scott

I'll try the wire tie idea to hold connections tighter, though none of them were found loosened beyond the snap that holds them together.
Also going to search the forum for how folks have replaced the King Controls with something else.

Re: Stuck roadside again

Reply #20 – May 06, 2022, 10:17:40 am

1998 295 should be a mechanical injection engine with no ecm. My coach has been converted to an air throttle that is very reliable. The conversion kit is available on the web. Parts are still being made.

Re: Stuck roadside again

Reply #21 – May 06, 2022, 10:22:09 am

If that comes to pass don't throw the King away,starting to collect old parts,maybe can piece one together.

Re: Stuck roadside again

Reply #22 – May 06, 2022, 12:16:13 pm

I clean the sockets and spray atf on everything.!

Re: Stuck roadside again

Reply #23 – May 06, 2022, 05:05:00 pm

Quote from: Protech Racing – May 06, 2022, 12:16:13 pm

I clean the sockets and spray atf on everything.!

ATF?

Re: Stuck roadside again

Reply #24 – May 06, 2022, 05:47:16 pm

Automatic transmission fluid

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