Won't Start DD S-40

[Lostranger]

Other than during a wiring problem we had in the fall of 2013, Sophia has never failed to start instantly and run perfectly. About a month ago, she idled rough and smoked (white). After a few minutes, she smoothed out and ran well the rest of the day. No more starting problems. Until she sat overnight again. Then it was the same story.

Now it's been two weeks since she was started, and she won't start. Turns over fine. I unscrewed the fuel filter and it's full. Any ideas.

FWIW, I did not have this problem until after I changed the muffler. I can't see how the two issues would be related, but I'm always willing to be educated.

TIA

Jim

[Dave5Cs]

Dirty fuel filters? Muffler different size less or more back pressure? check oil for water?And or fuel? Fuel pump pumping as in no fuel getting to engine? Dirty air cleaners? Sorry thats all I got Jim.
Dave

[lostagain]

Low coolant level?

JC

[eagle19952]

sounds like something in the shutdown system to me too.   

[luvrbus]

I'll see what I can find for you if that is a electronic series 40 it will be a Cat system not a DDEC

[Lostranger]

Thanks, Clifford. You're right about it not being DDEC.

Working on it now. Definitely have fuel pressure to injectors. Something electrical is keeping the injectors from opening, and from the way the problem developed gradually, it's probably not a fuse or a relay. I have factory manuals. Can't find a tripped fuse or blown relay, but that does not mean I've not missed one. I have the interlock switch off, so a bad sensor should not be keeping it from starting.

We've started it several times on fluid, but it never picked up fuel.

Still looking.

Jim

[Lostranger]

We've pulled some codes, but I've not yet found them listed in the manual. Anyone know of a site showing S-40 codes?

[Lostranger]

Been able to pull codes. Main one seems to be 124.

124 is Injector Control Pressure Sensor reading low. May be faulty sensor or wiring, but might also be low fuel pressure. Several sites talk about the check valve just ahead of the fuel filter giving trouble. Could that cause low fuel pressure during cranking? I guess injector pump could also be bad.

[luvrbus]

Check around your bus may have a supply pump before the injection pump,you can bypass the IPR fwiw you don't want to buy a injection pump,that is only at last resort

[moosemanusa]

I have a pretty large list on manuals.. whens the ECM on that unit?

[azdieselman]

The Series 40 is a rebadged DT 466.

There are multiple versions of that platform, What year? Any pics?

[LuckyChow]

I believe his bus is a 1999. 

[luvrbus]

AZ Diesel Man, Kevin you are corn shuck-er expert tell us his problem all I ever do is replace # 5 piston on the EGR models 466's

[Lostranger]

Bus is a '99 Gillig H2000LF. I have factory Service, Schematics and Parts manuals. They're all light on engine information.

Internet research suggests that the check ball located above the fuel strainer is prone to give trouble that can result in low fuel pressure. Rush International Truck Center has a location in Candler, about 50 miles from me. They're getting the ball and o-ring shipped in from Charlotte and should have it in two days. It's $15 plus the trip, and I have several other things I need to do in that area. I'll change those two little items since they have a bad reputation. International parts man referred to the fuel strainer (screen before filter) as a "rock crusher." Colorful.

I have a diesel mechanic friend who's bringing a service truck here after work today or tomorrow. At his suggestion, we're gonna pressurize the fuel tank with his compressor and see if the engine starts. If it does, we'll know that the injector control pressure sensor is good. If it does not start, we'll try bypassing the sensor.

I found it interesting that neither the VIN nor the engine number showed up in International's system. I know from past experience that the Detroit Diesel places won't even talk to me about a S-40. Gillig tells me that they don't have engine info since the engine could have been changed. It hasn't.

I guess this engine is an actual bastard. I don't blame the engine, however. It's the parents fault.

Jim

[moosemanusa]

A lot of those LF's had the Cummins ISB motors..

Nice to see an unmodified one