Multiple issues with '05 379 Long Nose

[danj_otr]

I just got into my '05 Pete, and will try and give you as much information as I can.

First off, it just had it's B-Service approximately 2000 Miles ago (when I got the truck). It has a new fuel filter which is not showing signs of being clogged, it also has 2 new air filters which is showing a maximum of 2 Inches H2O.

Engine: Cummins ISX rated at 475 Horse
Exhaust Brake: "C" Brake
Transmission: Eaton Fuller 13 Speed

Here are the issues that I am having.

• *Exhaust brake intermittently works when running with cruise off.
  *Exhaust brake does not work at all with cruise on.
  *Regardless of weight or if I am loaded for that matter, speed falls off very rapidly and either have to down-shift at the shallower base of a hill. (I know that I can expect deceleration, but not as fast as this is losing speed).
  *When the R's get down to around 1000-1200 it is making the equivalent to a "coughing" noise and have to down shift.
  *When I am idling, it is idling really rough around 500 R's

I was told that there is possibly some blue smoke coming from my stacks, however it was not consistently happening.

On a side note, the truck was struggling going up White Bird (US 97) and when I was on a 6% grade, I was averaging 22-25, and when it went to 7% grade, I was averaging 19-22. Fan was on, Heat was on, A/C was turned off.

Stats:

• *Oil Temp: 230
  *Water Temp: 190-200
  *Transmission Oil Temp: 175-200
  *Pyrometer: 700-800
  *Oil Pressure: 30-35
  *Manifold Pressure: 20-30
  *Outside Temp: 68-72

If anyone has ideas, I'd appreciate it.

[Fredog]

I just got into my '05 Pete, and will try and give you as much information as I can.

First off, it just had it's B-Service approximately 2000 Miles ago (when I got the truck). It has a new fuel filter which is not showing signs of being clogged, it also has 2 new air filters which is showing a maximum of 2 Inches H2O.

Engine: Cummins ISX rated at 475 Horse
Exhaust Brake: "C" Brake
Transmission: Eaton Fuller 13 Speed

Here are the issues that I am having.

• *Exhaust brake intermittently works when running with cruise off.
  *Exhaust brake does not work at all with cruise on.
  *Regardless of weight or if I am loaded for that matter, speed falls off very rapidly and either have to down-shift at the shallower base of a hill. (I know that I can expect deceleration, but not as fast as this is losing speed).
  *When the R's get down to around 1000-1200 it is making the equivalent to a "coughing" noise and have to down shift.
  *When I am idling, it is idling really rough around 500 R's

I was told that there is possibly some blue smoke coming from my stacks, however it was not consistently happening.

On a side note, the truck was struggling going up White Bird (US 97) and when I was on a 6% grade, I was averaging 22-25, and when it went to 7% grade, I was averaging 19-22. Fan was on, Heat was on, A/C was turned off.

Stats:

• *Oil Temp: 230
  *Water Temp: 190-200
  *Transmission Oil Temp: 175-200
  *Pyrometer: 700-800
  *Oil Pressure: 30-35
  *Manifold Pressure: 20-30
  *Outside Temp: 68-72

If anyone has ideas, I'd appreciate it.

we have 3 05 petes with 475 cats and 10 speeds. all 3 have been trouble. water pumps. turbos, alignment issues, and so forth, maybe it was just a bad year, all the other ones we have, both older and newer have been normal. I can tell you that on all pete's, when the cruise is turned on (whether or not it is set) the exhaust brake will not come on until you hit the brake pedal. Pete thought that was better idea.

[danj_otr]

Well, that seems kinda silly to not have the exhaust brake come on when you have the cruise on. If that is the case then I guess it's really not a problem at all. Still gonna have it checked out though. Thanks

[Rev.Vassago]

*Exhaust brake intermittently works when running with cruise off.

Might be a connection that is loose.

*Exhaust brake does not work at all with cruise on.

That is a computer set up issue. I believe they can set it so it works with the cruise as well.

*Regardless of weight or if I am loaded for that matter, speed falls off very rapidly and either have to down-shift at the shallower base of a hill. (I know that I can expect deceleration, but not as fast as this is losing speed).

Cummins produce more torque when running at higher RPM's. My 565 cummins is the same way. I always drop a gear before a big hill, and then I don't have the issue as much. Try getting your RPM's above 1500 before the hill, and see if it helps.

*When the R's get down to around 1000-1200 it is making the equivalent to a "coughing" noise and have to down shift.
*When I am idling, it is idling really rough around 500 R's

Have the EGR checked. Cummins was having a problem with them around that time.

Stats:

• *Oil Temp: 230
  *Water Temp: 190-200
  *Transmission Oil Temp: 175-200
  *Pyrometer: 700-800
  *Oil Pressure: 30-35
  *Manifold Pressure: 20-30
  *Outside Temp: 68-72

If anyone has ideas, I'd appreciate it.

Your oil temp seems high. It should be running around 200 at the most.

[danj_otr]

In regards to the hills, it does not matter. :shock: I can take a small hill and it is losing speed as if it was taking a large hill. I can understand some loss in speed, but when it drops off really fast I would be inclined to think there is a problem. Even if I drop it a gear before the hill it loses the speed just as fast as if I left it in the same gear!

[Bobby]

I have a 01 w900 W/ C15 and my oil temp seems to stay below my water temp a bit, 175 degree or so.

My Jake also won't work with the cruise on.

I'm not sure what the oil pressure should be at on a Cummins ?

I have twin air filters also and the filter gauge on the dash hardly moves,,, 2lbs with my foot in it.

Your idle seems low, the Cat idles around 625 rpm.

[BigDiesel]

If it is a company truck... who cares. Take it in and get it looked at.

[danj_otr]

It is, I just wanted input from others who might have some ideas so I know if I am going in the right direction when it goes to Cummins tomorrow.

[TK THE TRUCKER]

It may say 475 on the engine tag but the company might have that thing turned way down. One truck I drove the engine brake came on with the cruise but not till I was 5 mph over the set point on my cruise. So if I had it set on 65 she'd roll until 70 and then the engine brake would come on. Is yours not coming on no matter how fast over your cruise set point your going ?

[special k]

I have a Cat so this info could be wrong for you but you should be able to get them to reset your cruise to a "hard "setting that means the cruise will give the engine more fuel when your speed drops. This will hurt your mileage a bit but so does downshifting for all the hills. You can also get the cruise parameters closed up tighter so the cruise will come on sooner to keep your speed up. Mine is at 3mph insted of 5mph from your chosen speed. Lastly they should be able to make your jake work on cruise too.

[danj_otr]

It may say 475 on the engine tag but the company might have that thing turned way down. One truck I drove the engine brake came on with the cruise but not till I was 5 mph over the set point on my cruise. So if I had it set on 65 she'd roll until 70 and then the engine brake would come on. Is yours not coming on no matter how fast over your cruise set point your going ?

Yeah exhaust brakes are not coming on at all whenever it is in cruise!

[allan5oh]

wait a minute, coughing sound? Is this when you go to downshift, and back off the throttle?

Try rolling off the throttle instead of snapping it shut, or if its on the cruise put your foot on the throttle half way, then hit the clutch with the other foot.

You're going from a massive positive pressure in the exhaust manifold to a negative one, and it's making that sound.

There's nothing wrong with the truck with this problem.

[danj_otr]

wait a minute, coughing sound? Is this when you go to downshift, and back off the throttle?

I wish it was that simple! :shock: When the R's get down there it is because I am trying to get down to a shift point and I still have my foot in the throttle. There is no change in anything I do when this happens. The only time this happens is when I am going up hill (or about to crest a hill), the R's are low, and the engine is under load. That is the only time it happens!

Thanks for the suggestion though!

[sidman82]

Dan, sounds like your turbo could be on the way out. All of what you explain with power issues would cause what is happening to you.

[COLT]

1000,1200 Revs... Way too low for anything other than flat ground, not much wieght, no wind... Gese... I wiegh 125- 140,000 lbs, Get your revs up and keep them up, the other issues are c.p.u. settings. The low idle could be a cold engine paramiter .... ?

[danj_otr]

Found out that I was driving the truck as if it had a Detroit 60 Series in it and was actually lugging the engine. I now run it from 1400-1800 and have not had as many issues.