Duramax Diesels Forum Truck of the Week
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Old 11-02-2017, 10:38 AM
Cloudy Cloudy is offline
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Default Continued LBZ problems -- died

Decided to create a separate thread for this issue. My old thread can be found here http://www.duramaxdiesels.com/forum/...ad.php?t=77913

So long story short, I had an injector fail that caused knocking. I got hosed on the replacement of the injector (dad's friend's shop, which is the most frustrating part) and the diesel tech there said I had one other injector after the replacement that was a bit out of spec and could be an issue and that the truck isn't running 100% still. The tech recommended running some injector cleaner through and see if that helps, and if not the other injector could probably stand to be replaced. I drove the truck about 20 miles and it ran/drove good, and still sounded a tad "choppy" (for lack of a better term), but better that it sounded when I first created this thread. Still no smoke or haze.

I bought some Kleen Flo injector cleaner stuff (wasn't my first choice, but was all they had available at my local parts store and I figured it was all the same snake oil anyway), put it in the tank along with a full tank of fuel as recommended on the bottle. I drove it maybe a total of 50 miles when this morning. I was sitting at a red light, and suddenly started smelling what sort of smelled like a mixture of diesel fuel and that additive, and the truck started making a few quiet, but strange sounds. Can't even really describe what they sounded like, but it wasn't a knock or anything. Drove off from the red light, was still driving fine with full power, then I yielded to oncoming traffic, tried to accelerate again and suddenly the truck had no power, started making the strange noises again, the smell in the cab became more prominent, and then died and shut off. Truck still cranked but no start.

Popped the hood, didn't see any oil sprayed everywhere, but didn't get any kind of close look because the ****ing thing broke down on the busiest, narrowest two lane bridge in the city in the middle of morning rush hour traffic on the first cold and snowy day of the year, so it wasn't really safe to be around the vehicle. I'm having the truck towed to my backyard for the next bit until I can find a good, reputable diesel shop that won't completely rip me off, and as soon as I get home I'll take a much closer look at it.

In the mean time, any ideas? I'm hoping the engine, since it still cranks, isn't totally FUBAR'd, but I wouldn't be shocked if an injector tip dropped or something knowing my luck at this point. I know the CP3s are pretty bulletproof on these trucks, but would an injection pump failure make sense? It would certainly explain the smell of diesel fuel in the cab, and if it died then the truck would definitely not start, but in theory still turn over, correct?
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Old 11-02-2017, 10:46 AM
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IOWA LLY IOWA LLY is offline
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Since you can smell fuel you most likely have an external fuel leak. Find that first.


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Old 11-02-2017, 12:14 PM
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Quote:
Originally Posted by IOWA LLY View Post
Since you can smell fuel you most likely have an external fuel leak. Find that first.


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Certainly seems like an external leak somewhere. The truck is unfortunately sitting in a pile of snow, so I couldn't wiggle underneath to get a good look, but near the back of the engine on the undercarriage there is a nice coating of diesel fuel. Starting to think perhaps maybe one of the fuel lines or return lines wasn't installed properly.
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Old 11-14-2017, 08:33 AM
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Well, couldn't find the leak myself. Was dripping off the bellhousing but also pooling in the valley of the engine. Took it back to the shop, he tore into it a bit and found metal shards near the injection pump, looking like a hole is in the side of it. Said it was reminiscent of when an engine throws a rod through the block.

Okay seriously, what is going on here? Bad fuel? Just unbelievable bad luck? Mechanic said he's not really sure but I don't exactly trust his competency at this rate.
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Old 11-14-2017, 09:27 AM
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For a CP3 pump to fail it could certainly be bad fuel. Failures like your describing do happen but are pretty rare.

Btw your injectors are more then likely all junk now


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2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
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Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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Old 11-14-2017, 09:30 AM
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Popped one of the freeze plugs out of the back of the CP3, or somebody is covering their ass for not tightening a high psi or return line...
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Old 11-14-2017, 10:37 AM
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Quote:
Originally Posted by IOWA LLY View Post
For a CP3 pump to fail it could certainly be bad fuel. Failures like your describing do happen but are pretty rare.

Btw your injectors are more then likely all junk now


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I suppose bad fuel could for sure be a possibility. When I picked the truck up from the shop, it had been at around 1/4 tank and so I fueled it up fully. I also ran a bit of diesel injector cleaner that they gave me. Didn't use more than the bottle prescribed, and hadn't ran any other additives the tank of fuel before that.

I asked if the mechanic when he phoned if he figured the injectors would be shot now too. Said he didn't think so, but I suppose you don't really know until the pump gets replaced to check. I know CP4s usually take out the injectors when the pump grenades. My buddy's uncle had a 6.4L that also took out the entire engine at 70k miles when the HPFP grenaded on him. At least the truck cranked really good so hopefully the engine is alright.

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Originally Posted by RPM Motorsports View Post
Popped one of the freeze plugs out of the back of the CP3, or somebody is covering their ass for not tightening a high psi or return line...
Freeze plug could make sense if buddy was looking through a mirror to see what was wrong and just saw a hole in the side of it, but I'm also not sure why the freeze plug would pop out while driving..

Regardless, I'm trying to get it towed to a specialty Duramax shop that was recommended to me and then I should get a much better opinion on what happened. The mechanic at this shop was trying to tell me that injection pump failure on the 2010 and earlier trucks isn't all that uncommon.
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Old 11-14-2017, 10:56 AM
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Quote:
Originally Posted by Cloudy View Post
The mechanic at this shop was trying to tell me that injection pump failure on the 2010 and earlier trucks isn't all that uncommon.
Maybe Not uncommon after he works on them...
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Old 11-14-2017, 11:39 AM
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Oh here's the real kicker: he says the cost to replace the CP3 is $3200.

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Old 11-14-2017, 12:03 PM
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Freeze plug comes out when the pistons and rods decide it doesn’t want to be a cp3 anymore. The broken rod knocks the freeze plug out.

Catastrophic cp3 failures aren’t super common but do happen from time to time. I would be very concerned that any of that failure made it to my injectors. IIRC gm had issues with a ceramic ck ball failing in the early lbz cp3. I don’t recall it causing massive failure of the pump though.
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Old 11-14-2017, 03:18 PM
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I only ever heard of catastrophic failure when they were boring and stroking the CP3s. There would be so little piston contact at the bottom it would kick over and blow out the side.

3200 is quite steep for just a CP3 replacement. I would be more worried about your injectors if it really did grenade.
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Old 11-15-2017, 07:49 PM
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Thought you guys might like to see that. Crazy.
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Old 11-15-2017, 07:55 PM
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It happens.
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Old 11-15-2017, 08:27 PM
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For sure. A guy can't help but laugh at his luck.

Also didn't mean to post such an obscenely large photo. My apologies.
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Old 11-15-2017, 09:33 PM
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Quote:
Originally Posted by Cloudy View Post
For sure. A guy can't help but laugh at his luck.

Also didn't mean to post such an obscenely large photo. My apologies.
Damn, maybe you should by a lotto ticket...


Sorry about your luck. Thanks for the update.
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