Honeymoon is over................. - Chevy and GMC Duramax Diesel Forum
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post #1 of 325 (permalink) Old 06-03-2018, 08:01 PM Thread Starter
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Honeymoon is over.................

In this thread https://www.duramaxforum.com/forum/g...80178-wow.html I was praising my new-to-me Duramax Silverado.

In another post in my history somewhere, I also mentioned where the only vehicle to ever leave my family and I stranded, was a GM...well, it happened again.

Two weeks ago, we towed our trailer through the Canyon, without a hiccup. On the Sunday of that weekend, we towed it further because we would be visiting some friends of ours the following weekend (this weekend just past). We dropped the trailer at their property and went home; it was after that ride home that I extolled the beauty and power of my new truck.

On Friday, June 1st we left home just after 5:00 pm. There were four of us in the truck...no trailer...and maybe 200 # of food, clothing and gear in the back. We were doing just fine along the lower stretches...about 65 or 70 mph with the Cruise Control engaged and I meant to place it into Tow/Haul mode before getting to the snowshed, but forgot.
When we hit the snowshed, the Engine light came on and she started to push a lot of black smoke. I made it to the exit a few miles further along and checked under the hood for anything obvious but couldn't find anything obvious.
I looked through the glovebox manual and it said that if the light is on steady, it is an EMISSION CONTROL issue, so seeing nothing obvious, I figured it might be the EGR valve got stuck or something along those lines....anything to do with EMISSIONS shouldn't be a big deal.
We carried on...every time I would exceed 1800 RPM, she would push black smoke, so I stayed light on the foot.

When we arrived to our destination, our friend had his code-reader with him (I forgot mine at home....along with ALL my tools!!!) and we discovered a P0299 Turbocharger underboost condition. We cleared the code, thinking it might "reset" whatever set it off in the first place, but when we drove to town the following day, she still smoked if I exceeded 1800 RPM under load (going uphill).

When it came time to leave today, we hooked the trailer back up and started on our return journey home. We got 2 miles from their place when the ENGINE light came on again, and I assumed it was the same issue.
I took it VERY easily along the highway, doing my best to be as gentle as possible...but she still smoked like a locomotive whenever any pedal is applied. We got past the turnoff and started climbing another hill. As the engine speed dropped I put a bit more foot into it to get her to downshift and she just died.
I couldn't get over 2000 RPM out of her and as many MPH's as that engine speed will give. I assumed she had gone into Limp mode but there was no indication anywhere that this had happened.
We came to a stop at a trucker's brake check, and called BCAA to get us a tow truck....for the truck, our RV and 4 adults.....we waited about 3 hours before the truck arrived and he drove us all the way home, with all of our gear and stuff.
When home, I connected my Reader and discovered that along with the P0299 underboost condition....I now also have a P0087 fuel rail/system pressure too low bank 1 alarm as well.

So....how much/what am I looking at to repair all of this....will this happen every time we encounter a hill....and more importantly, should I cancel the sale of my Powerstroke?
Sorry for that last one....but surely you can imagine how pi$$ed I am, forsaking a vehicle that was rock-steady and reliable, for this one that $hit the bed the second time I used it.

Last edited by Qwazert; 12-31-2018 at 10:34 AM.
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post #2 of 325 (permalink) Old 06-03-2018, 09:36 PM
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Well it's 11 years old, and now you know why they sold it. Could be a simple thing like a dirty fuel filter, or more expensive like a fuel pump. How many miles on the truck? Some people never do any maintenance until there's a failure. Maybe the previous owner was one of those . Good luck Dave-R
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post #3 of 325 (permalink) Old 06-03-2018, 09:53 PM
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Could have knocked an inter cooler pipe loose if you think the onset of the smoke corresponds with hitting a pothole.
Maybe P0087 from romping on it when it was down on power from a boost leak and popping the FPRV?

Just guessing, but it could’ve happened given the story you describe.


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post #4 of 325 (permalink) Old 06-03-2018, 09:54 PM
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Lookout for engine surging with p0087, could be a FPR. Maybe FPRV?

2004.5 GMC Sierra 2500HD SLT
  • 5” MBRP Straight pipe
  • Edge CS2 Tuner
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post #5 of 325 (permalink) Old 06-03-2018, 09:56 PM
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Sounds like a big boost leak to me which is usually a cheap fix just sometimes time consuming to find. Start with something easy like fuel filter like what was already said. After that if you have no luck check for collapsed fuel lines and boost leaks. My bet is on a boost leak rather than fuel issue because theres no way enough fuel can be delivered in order for it to smoke like it is if the fuel is restricted by anything. Smoke=alot of fuel and not enough air


-head studs and gaskets
-66mm (stupid loud)
-5” straight pipe axle dumped
-shimmed
-full s&b intake and mouthpiece
-dans diesel 800 HP built trans with biller stator
-dans built trans tunes
-glowshift EGT, boost(not working because i broke it), fuel pressure(have not found a sender to work for it help please), edge cts2
-PPE sleeves
-fuel lab 100 gph lift pump
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post #6 of 325 (permalink) Old 06-03-2018, 09:57 PM
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Quote:
Originally Posted by Eddie_LLY View Post
Could have knocked an inter cooler pipe loose if you think the onset of the smoke corresponds with hitting a pothole.
Maybe P0087 from romping on it when it was down on power from a boost leak and popping the FPRV?

Just guessing, but it could’ve happened given the story you describe.


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I think eddie hit it on the head^


-head studs and gaskets
-66mm (stupid loud)
-5” straight pipe axle dumped
-shimmed
-full s&b intake and mouthpiece
-dans diesel 800 HP built trans with biller stator
-dans built trans tunes
-glowshift EGT, boost(not working because i broke it), fuel pressure(have not found a sender to work for it help please), edge cts2
-PPE sleeves
-fuel lab 100 gph lift pump
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post #7 of 325 (permalink) Old 06-03-2018, 10:38 PM Thread Starter
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But if I "popped the FPRV"....wouldn't there have been a visible fuel leak somewhere?
As I mentioned, I owned a 97 Powerstroke for 6 years and am still not 100% certain of all the intricacies of that model....I just bought this one, so my knowledge of it is even less.

As for the maintenance schedule of the PO...he assured me (and he doesn't seem like the type that would lie about it...he was a senior who suffered a stroke and could no longer drive) that it was well maintained by an ex-GM mechanic....but anything is possible, I guess.

The fuel filter shows as 91% life left in it. The first thing I did (after buying it) was change the oil and filter and have the transmission serviced. I also had the serpentine belt and left front wheel bearing replaced.
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post #8 of 325 (permalink) Old 06-03-2018, 10:47 PM
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Quote:
Originally Posted by Qwazert View Post
But if I "popped the FPRV"....wouldn't there have been a visible fuel leak somewhere?
As I mentioned, I owned a 97 Powerstroke for 6 years and am still not 100% certain of all the intricacies of that model....I just bought this one, so my knowledge of it is even less.

As for the maintenance schedule of the PO...he assured me (and he doesn't seem like the type that would lie about it...he was a senior who suffered a stroke and could no longer drive) that it was well maintained by an ex-GM mechanic....but anything is possible, I guess.

The fuel filter shows as 91% life left in it. The first thing I did (after buying it) was change the oil and filter and have the transmission serviced. I also had the serpentine belt and left front wheel bearing replaced.
http://www.dieselplace.com/docs/dura...sched_1per.pdf
Heres a maintenance schedule, its the one i follow and from GM if im not mistaken.

2004.5 GMC Sierra 2500HD SLT
  • 5” MBRP Straight pipe
  • Edge CS2 Tuner
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post #9 of 325 (permalink) Old 06-03-2018, 11:06 PM
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I'd guess for sure a boost leak of some sort given your P0299 code and the fact you were blowing black smoke as your turbo was trying to light. A boost leak generally isn't a big deal, could be something simple like an intercooler clamp coming a bit loose.

The more problematic issue is a P0087 code on LBZ is usually one of three things: FPRV, injectors, or the CP3 pump. Essentially pray that it's the FPRV, and then to a lesser extent, the CP3. I was quoted about $2800 to replace the CP3 here in Canada, and a whole set of injectors for my LBZ was something like $7500 since apparently recently the price of 'em has increased to like $600 per here in Canada. Be interesting to find out if that code is related to your boost issue.

Best of luck and hopefully it's nothing serious, and ideally you have budgeted for potential repairs. End reality is it's a used 11 year old diesel truck, things absolutely can and may go wrong with it. Sure an old retired guy owned it, but maybe what he neglected to tell you was that his 20 year old hotshot grandson has been the primary driver of it the last few years. Lol.

06 LBZ

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post #10 of 325 (permalink) Old 06-03-2018, 11:07 PM Thread Starter
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Quote:
Originally Posted by Eddie_LLY View Post
Could have knocked an inter cooler pipe loose if you think the onset of the smoke corresponds with hitting a pothole.
Maybe P0087 from romping on it when it was down on power from a boost leak and popping the FPRV?

Just guessing, but it could’ve happened given the story you describe.


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Do I have an intercooler? What does it look like and where does it tie in to the engine components?
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