Truck Driving Jobs

firebird_1252 · #11 11-28-2011, 02:12 AM

go to a dealer and get the CAC checked. mine was cracked and it made a huge diffrence with the mpg. my mbn cat climbing hills running 65-70 has been anywhere from 6.25-6.5.. before that it was 5.5-6 mpg

rank · #12 11-29-2011, 12:53 AM

well......we used to have a 1995 model year 435hp N14 (Celect) and I could only manage 5 mpg driving 60 to 65 mph on flat terrain, so I'm not really surprised you're getting 4.5 doing 70. We now have a 2008 14L ISX and it gets even worse mileage.

Idling will kill your mileage pretty good also.

What makes you think something is wrong? Did you used to get better mileage with this truck?

sc5952 · #13 11-29-2011, 07:23 PM

Previous owner got 7.3-7.5 so he claimed. Onboard stuff agreed but you can reset it and manipulate that. i just want to get in 5's, nothing huge. My driver did inform me this morning that when he initially took off he thought he heard air leak on of air charge system but once he got rolling couldn't hear. When it gets back in shop I'll thoroughly check it.

rank · #14 11-29-2011, 08:31 PM

Quote:

Originally Posted by sc5952

Previous owner got 7.3-7.5 so he claimed.

I don't think I buy that. They must have been awful light loads. I'm driving an M11 Cummins, which is a 10.7L engine vs the 14L of the N14, and I only get 6.75 - 7.0. IIRC, I lost ~.75 when I put the new lugged drives on. You have 30% more cubic inches than I do.

sc5952 · #15 11-29-2011, 08:54 PM

Thats why I put the he claimed part, lol. I don't believe it either but positive more there than 4.5 mpg. He did haul light van loads he said.

Musicman · #16 11-30-2011, 03:08 PM

Quote:

Originally Posted by sc5952

Previous owner got 7.3-7.5 so he claimed. Onboard stuff agreed but you can reset it and manipulate that. i just want to get in 5's, nothing huge. My driver did inform me this morning that when he initially took off he thought he heard air leak on of air charge system but once he got rolling couldn't hear. When it gets back in shop I'll thoroughly check it.

You can't easily reset or manipulate the ECM. Have you looked at a print out of what the ECM itself shows for miles and fuel consumption? I'm not talking about what the in-dash fuel computer shows, I mean take the truck to the dealer and have them print out everything logged in the ECM... there's a big difference.

sc5952 · #17 12-03-2011, 06:06 PM

I put new computer in (well Volvo did) when I bought truck. Previous owner I believe hooked charger up to it backwards and killed it. Guy had sitting because heart problems. Has about 30k miles since then. However when I took in shop to have thermostats changed I told them to pressure check air charge cooler and it has lots of little leaks not noticeable when not under boost, I ordered new air charge cooler that showed up little while ago. Hopefully with correctly working thermostats and sealed intercooler it will get at least 5 mpg, would be nice to get a lot more but would be happy with 5. Only time and miles will tell.

Musicman · #18 12-04-2011, 08:40 PM

Quote:

Originally Posted by sc5952

Hopefully with correctly working thermostats and sealed intercooler it will get at least 5 mpg, would be nice to get a lot more but would be happy with 5. Only time and miles will tell.

Keep us posted. I'll be curious to see the results for sure.

sc5952 · #19 12-08-2011, 09:25 PM

Well I got thermostats in and was going to put air charge cooler in but they sent wrong one so I sent truck down the road the way it was. So far after 1500 miles or so it seems to be .50 mpg better but hard to tell since not many miles. He has filled twice (wasn't closed to empty). First fill he got 4.75 mpg, but he sat idling for like 10.5-11 hours on that tank. He filled in Fountain CO today and was 5.27 mpg sitting 7-8 hours idling. Keep in mind it was getting 4.5 mpg religously. When he gets back tomorrow night I am putting new correct air charge cooler in (well actually will be Saturday when I swap). Hopefully gets little better yet, only time and open road will tell true story of this beast. Highly considering putting APU on it after first of year. How much fuel you think 500 hp n14 Cummins will burn idling?

solo379 · #20 12-10-2011, 03:07 AM

Quote:

Originally Posted by sc5952

How much fuel you think 500 hp n14 Cummins will burn idling?

Anywhere between 1-1.5 gallons per hour, depending on a load. ECM shows that wrong. For heat, i'd recommend Espar. Will keep you warm 24 hours for about a 1 gallon. Pays for itself in a less than one year at today fuel cost.