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LLY Duramax owners??

Burt4x4

Burt4x4

1 Ton First Gen
Joined
Feb 17, 2000
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Location
California (Modesto area)
May be dumb question but I could not find it posted...

Do you have to wait with the ignition on before you start up the LLY?? I seam to remember deisle engines needing the glow plugs warmed up prior to starting? Or is this not an issue on todays engines? /forums/images/graemlins/dunno.gif
 
I have an LB7, but the LLY is the same in this respect. Yes, you do. They both have glow plugs. That said, I've had several "gas drivers" crank mine cold without waiting and it always fires right off even in the Winter (all the way down into the upper 30s... brrrrr ) Mainly it's just to save the starter and aid in REALLY cold starts.
 
Oh ok so there is no light that comes on or goes out?
Maby I should drive one...naaa just buy it hehehehehehe /forums/images/graemlins/woot.gif /forums/images/graemlins/woot.gif
Thanks
Burt /forums/images/graemlins/peace.gif
 
Yes there is a "Wait to start" light on the dash. My grandfathers 99 CTD took about 5 seconds to go off where as my 03 takes about 1/2 a second. It's almost off by the time you get the key from run to start... And like said above, I had a car wash dude get in yesterday and crank it rightaway without waiting and it fired right up.
 
Yes, there is a light in the DMax too. Mine takes maybe 3 seconds to go out on the '02. And you only need to wait when the motor is cold, though I've inadvertently conditioned myself to wait every time.
 
And remember Burt, gas station Diesel is a no no... Truck stops is the only way to go... You have no idea how long the diesel has been sitting in the tanks at the local gas stations, but truck stops go through that stuff like crazy. Just say no to dirty diesel /forums/images/graemlins/thumb.gif
 
Really???
Thanks!
You guys need to tell me all the 'tricks f the trade', I an't never owned a diesel beefer /forums/images/graemlins/pimp1.gif
I have a Flying J just up 99 from me /forums/images/graemlins/waytogo.gif
I never heard of dirty diesel??
What else do I need to Know?
 
Hmm, what else...

Keep up on your maintence religiously... Do not use Fram filters... I used to be a strictly Baldwin filter guy but Cummins does not list them as a supported filter so I use Fleetguard, since it is made by Cummins, I doubt they will deny waranty due to a filter problem. On TDR some have reported Fram's coming apart and plugging up oil passages and killing the engine, Cummins won't waranty it because they strongly enforce their "no fram" filter policy. Besides that fram sucks anyway, so you should know that /forums/images/graemlins/rotfl.gif

I buy a 4/2/1 kit from Genos Garage which has 4 oil filters, 2 fuel filters, and one air filter, all Fleetguard except the Cummins air filter. I save about 30% buying the kit over buying everything seperate and it comes with enough stuff to last quite a while. I don't know if there is a kit for the Duramax from somewhere else but it's worth looking into to save money.

I use Castrol Synthetic Blend, it is stamped rated for Cummins right on the back so thats why I use it. But they don't recommend synthetic or blend until 20k miles, may be the same on the duramax but I don't know.
 
Actually, if it has not changed, all DMax filters are made by Racor at this time. Whether it says Racor, Fram, or Wix, they are all the same.

Use a diesel oil. I use Rotella, though I may well switch to Mobile 1.

Stay away from stuff like the K&N. Research (real research) on Tthe Diesel Place shows that the paper is actually better across the board for filtration, and so close it does not matter for performance. Anyone want to buy a UNI?

The exhaust on a DMax is very good stock. Major improvements from nothing but a free flow muffler, minor improvements going 4", almost nothing beyond. Talking EGTs here, not power...

Never heard of "the kit", have to check into that...

Diesel is a problem for me, only "gas stations" (and very few of them) within an hour of me. /forums/images/graemlins/frown.gif Biggest problem with "station diesel" is that it sets longer which makes it more likely to accumulate water and biologicals (bugs). They also tend to not be diligent in keeping up with filter replacement intervals on the pumps.

Get and carry a spare fuel filter. One bad tank of fuel can leave you stranded on the interstate.

If you want performance, first mod should be an EGT guage. These things can make a ton of power very cheaply, but EGT will kill them if your not careful when straying beyond stock parameters.
 
If I were you Burt I would just run the standard PF2232 that GM tells us to use on the DMAX's, unless you can find the isuzu replacement one which I doubt you can, AND if your using an AC Delco filter your less likely to get crap from the dealer if you ever need warranty engine work. Also make sure you keep all of your reciepts if you do your own oil changes, and document the mileage.

Oh, dont run a K&N, it will void your warranty. Also run stock Air filters, the cheapies tend to not flow enough air and will actually get sucked up into the intake plenum, not good. We had one at work this week with that problem, had an SES light on for poor boost performance.

Have fun, the new LLY's seem to be working good, except we've had a few come in with problems overheating when towing. We have no idea why yet, GM doesnt know either, but these trucks are towing around 9k+ lbs.
 
Thanks DUDES!!!
I'm gonna keep the whole rig stock for now....I just want the damn thing in my drivway already!!! Forkin Banks are LAGGING!!!! Man you would think a simple refi would be ...well simple?????? /forums/images/graemlins/angryfire.gif
Thanks again for all the info /forums/images/graemlins/peace.gif /forums/images/graemlins/waytogo.gif
 
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Have fun, the new LLY's seem to be working good, except we've had a few come in with problems overheating when towing. We have no idea why yet, GM doesnt know either, but these trucks are towing around 9k+ lbs.

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Hmmm, thats interesting... What are the EGT's? I tow 15,000 pounds to the trail once a month or so...
 
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And remember Burt, gas station Diesel is a no no... Truck stops is the only way to go... You have no idea how long the diesel has been sitting in the tanks at the local gas stations, but truck stops go through that stuff like crazy. Just say no to dirty diesel /forums/images/graemlins/thumb.gif

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I found that out the hard way. I got about 1/8 tank of water when i filled up in northern wisconsin. I filled up at a "trading post" that had 1 diesel and 3 gas pumps. Just a few miles away i got the "water in fuel light", and it wouldnt go off. I made it to the bar where we stayed for about 4 hours so i could at least drain some water, then limped to my uncles place. I drained the rest the next day, put in a new filter, and checked injectors to make sure they werent bad. I will never fill up at somewhere that doesnt get heavy diesel traffic again.

But, I do fill up locally though at a brand new gas station, with brand new tanks. Its about $.20 cheaper than anywhere that isnt 10 miles away, and a LOT of guys go there now.
 
Interesting about you guys having problems with pump diesel. /forums/images/graemlins/thinking.gif
We have diesel tanks here on our ranch and don't have problems with water/bio build up at all on fuel that is used 6 months later after delivery. I wonder with the pumps that it's because the tanks are in the ground and there is a hole somewhere? /forums/images/graemlins/shocked.gif /forums/images/graemlins/dunno.gif
 
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Yes, there is a light in the DMax too. Mine takes maybe 3 seconds to go out on the '02. And you only need to wait when the motor is cold, though I've inadvertently conditioned myself to wait every time.

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i know what ya mean russ.
my first car was a 84 merc lynx(ford escort) with a 5 speed and a 4 cyl yokohoma diesel. the day i got my liscence i was happier than a puppy with two peckers and tired starting it without waiting for the glow plugs to warm up...
didnt work to well.

now with the cummins i can crank it right over and it fires up, but i have conditioned myself to get my key in, belt on and then fire it up. seems to start a little faster and thats less "no oil" time on the engine.

my advice is to wait if the truck is cold, any other time fire it right up.
grant
 
Jason, I dont know, we are still trying to figure out whats goin on. I think the radiator isnt big enough, cause the trucks are only overheating with a load on them. The first truck we had that does it is pulling a 15k pound 34 foot camper up the cajon pass at 55 mph WFO, at 90* ambient temp it got to 251*, which GM engineers say isnt overheating, but its too hot i think. Oh the truck is also lifted 6" running 35" mall terrains.
 
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