3406E 1LW engine help Please - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 09-18-2015, 07:39 PM Thread Starter
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3406E 1LW engine help Please

Im new here guys and have searched for other post about my issues but havent found any so here goes.

Bought a 1999 Cabover Freightliner from CA in March, brought it to TN and got it ready to work. It has a 1LW engine 475hp, 13 speed, 3.55 rears. The truck has 440,000 miles on it. It has the Cat display on the dash. It shows 220K miles. I pulled the records on the truck from Freightliner and it show that a new ECM was installed under warranty at 210K so all is good. I had the overhead ran, air to air checked, fresh service, oil sample checked good, 10 new tires, lots of other new parts put on then put it to work. The truck was a sick dog, and would only average 4.8 mpg pulling a van with 25k in it running the southeast at 65 mph (thats as fast as it would run when I go it). The Cat Id on the dash showed 4.8 which was pretty close to hand figuring.
Had the true Cat 550/1850 program put in and now it pulls like a dream. Made a huge difference. The Cat Id on the dash shows the MPG running between 6.5 and 7 cruising at 70 mph, but when I had calculate its still between 4.9 and 5.15 at best useing the miles off of the Cat Id box and odometer which are the same. Anyone know why hand calculating is so far off now from what the ECM shows?
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post #2 of 11 (permalink) Old 09-19-2015, 01:46 AM
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I use the GPS miles to calculate fuel mileage I don't trust anything else like I do the GPS.
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post #3 of 11 (permalink) Old 09-19-2015, 03:55 AM
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Is there a chance that there has been a tire size change or that the new program effected the way the ECM calculates things
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post #4 of 11 (permalink) Old 09-20-2015, 03:21 PM
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where or who did the Cat 550/1850 program? if it was at a dealer or Cat you have a low nox program which for EPA sake is a mpg killer and sometimes a dog.

I wonder if anybody has tested this low nox programs to see how much pollutant they expel and then test an early program with the same hp rating and compare calculating the extra amount of fuel burned, I'll be curious and hopefully they will end up equally or the early program being better.

we had a MBN with the latest low nox that burn exactly twice as much as my 1LW on the same load, I want some body to come here and tell me with a straight face that truck was better for the environment than mine.

my friend has two Petes 1 is a MBN the other is a 1LW, the MBN was almost twice as much on fuel until he got it reprogrammed.

if yours was done by a dealer, try to find a non low nox program and see what happens.
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post #5 of 11 (permalink) Old 09-20-2015, 05:00 PM
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Like H800T said, any dealer messing with your ecm is bad. They have what's best for EPA standards in mind, not your truck. You don't want that.
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post #6 of 11 (permalink) Old 09-21-2015, 01:20 AM
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Quote:
Originally Posted by H800T View Post
where or who did the Cat 550/1850 program? if it was at a dealer or Cat you have a low nox program which for EPA sake is a mpg killer and sometimes a dog.

I wonder if anybody has tested this low nox programs to see how much pollutant they expel and then test an early program with the same hp rating and compare calculating the extra amount of fuel burned, I'll be curious and hopefully they will end up equally or the early program being better.

we had a MBN with the latest low nox that burn exactly twice as much as my 1LW on the same load, I want some body to come here and tell me with a straight face that truck was better for the environment than mine.

SNIP.
Just to wander off topic.....
'Cause burning twice as much fuel puts more money in the oil guys pockets so they have more cash to bribe the politicians.
Wish we had Euro emissions standards instead, nox is irrelevant.
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post #7 of 11 (permalink) Old 09-21-2015, 01:40 AM
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I don't want to start a fight, but nox is NOT irrelevant. It contributes to lung cancer and many other bad things. Look it up.

Dave

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post #8 of 11 (permalink) Old 09-21-2015, 02:57 AM
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I don't want to start a fight, but nox is NOT irrelevant. It contributes to lung cancer and many other bad things. Look it up.
No fight here, we are all grown ups and we can have a civilized discussion.

I understand your point, but my point is, will an engine with low nox that will consume twice as much fuel as it was original be cleaner?

my guess is they can probably clean the engine a little bit but not twice as much, I would wonder to say by just changing some things in the ECM they might not even clean that engine 50%.
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post #9 of 11 (permalink) Old 09-21-2015, 04:59 AM
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I do agree with the idea of an engine burning twice the fuel to make it cleaner is wrong. I am with you on a little bit more to make the engine cleaner is OK. I never understood the EPA and their testing. I don't think the EPA is smart enough to figure out how to make the ECM work smarter and cleaner. I was following an older Ford Pick up (like 1980s) today and his exhaust stunk. It was not over fueled that I could tell. It just smelled bad and smoked blue smoke. My guess is he removed the smog equipment.

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post #10 of 11 (permalink) Old 09-21-2015, 05:39 PM Thread Starter
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Thanks for the replys fellows, Dealer didnt install the 550/1800 program, Im checking with the guy who put it in to see if he has any ideas. Crusing at 70mph pulling a van with 25k in it the engine stays around 30% on flat ground. I know its catching alot of wind but wouldnt have thought it would effect the mpg that much. BTW, The speedo and ecm miles are within 2 miles of the GPS miles on a 200 mile trip. If the ECM cant calculate the MPG any better that this, wonder why they even put it on there......
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