Somethings wrong with the truck, need a little help

[BCarmicle]

I passed someone on the road tonight and then when I let the truck get below 2000rpms the engine was driving very rough and felt like it was shuddering and making an odd sound. The engine drove rougher/shuddered the more I lugged it. I made it to my house(about 5 miles) and the engine idled very rough in drive and not as bad but still rough in neutral/park.



First thing I noticed when this happened was that when I would lugged the engine where it drove very rough, I could here a fluttering sound that was loudest at lowest driving rpms and I could also he it more prominently when I put my wastegate regulator up to my ear.



Second, when I put it in neutral/park to idle and cool down before shut off EGTs wouldn't get below 500 degrees no matter how long I let it idle.



Third, with the truck idling I checked to see if the exhaust sounded any different and it did. It sounded almost like a train, the way they make that pumping sound. The trucks straight piped but it definitely didn't sound like this before and wasn't as loud.



Fourth, I checked under the hood while the engine was running and I could here the pumping sound again, just not as loud, coming from the air filter or intercooler hose or something in that area around the twins.



Last, the truck was harder to start.



Water temp and oil pressure didn't act any different during this and I checked for codes and came up with nothing. I feel like it might be something clogged up or possibly turbo damage. Anybody have any ideas what this sounds like could be going on? Any responses will be greatly appreciated.



Brandon

 

[DPKetchum]

There has been some injector issues. Some have I guess hung open and burned pistons and valves. DON"T DRIVE IT! I would suspect if this is the case HIGH EGT'S. Someone posted about about their truck with less then 500 miles running rough and on test drive with the tech died. One piston had a hole in it that looked like a blow torch had burned a hole through it. Through the grapevine I have heard this has happened to a few nation wide. A few have also done this with aftermarket injectors also.

 

[BCarmicle]

Something else I noticed was that when I start the truck EGTs will climb and settle around 500 degrees. The truck seems to be okay above 2000rpm but through take off to around 1900 rpm the truck is very rough. Its also seem to be puffing smoke when it idles, but it really has no color to it, not black, white or blue.

 

[BCarmicle]

Just started the truck. The smoke is blue and it puffing alot of it out at idle. I know the color of the smoke tells something, what does the blue smoke represent?

 

[nickleinonen]

know the color of the smoke tells something, what does the blue smoke represent?

check your engine lube oil level... blue smoke is usually oil burning, but if the engine is cold, raw fuel [bad injector?] will cause it to blow blue smoke too... check for a high level, and see if you can smell fuel in the lube oil. if you do start it again, pop the hood and feel the HP lines going from the common rail to the injectors... you will feel something not quite like the rest of them if one is dead- either a solid knock for injector knock, or no real feel at all -injector tip blown off and pouring the fuel in, and not atomizing it.

 

[BCarmicle]

Something else I forgot to add was that I clapped off the blow-off valves. I talked to a guy tonight that goes to diesel school and he said it could be a broken ring and/or possibly a bad piston, or a blown head gasket since I am keeping all that pressure inside the engine. I checked everything else, does this sound like a possible piston problem?



Brandon

 

[DBoyd]

Please advise, what is a blow off valve????

 

[DPKetchum]

Could be all of the above. Sounds like its time to open it up and look.

 

[lmills]

Please advise, what is a blow off valve????

A blow off valve is a valve that releases excess boost pressure. A lot of guys running twins run them to help manage boost numbers since 85-100 psi of boost is easily obtained from twins.

 

[nickleinonen]

A blow off valve is a valve that releases excess boost pressure. A lot of guys running twins run them to help manage boost numbers since 85-100 psi of boost is easily obtained from twins.

those valves are really pop-off valves [safety pressure release valves with preset/adjustable pressure setting], not blow off/bypass valve. a blowoff/bypass valve is mostly used on gas engines because they have intake manifold vacuum to control them. . a blow off valve will dump boost from the HP side of the turbo into the atmosphere [blow off type] or dump it into the low pressure side of the system [ie: intake piping before the turbo -bypass type] during throttle release. they use engine vacuum created by the throttle body to actuate them. doesn't work for us having no vacuum source like that, but it can be made to work on a turbo diesel too... BD has a system called turboguard that does it, and you could make your own if you spend some time designing it... [i am tinkering with plans for one right now, but i am trying to do it on a low price budget]