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Old 12-11-2010, 09:41 PM   #1 (permalink)
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Blow by issues

i have a 2005 5.9 cummins. I have been having blow by issues lately and have been thinking it maybe an injector or down a cylinder from what i have read. however i am thinking it maybe something else since i havent noticed any power loss or loss of fuel mileage. I recently did a code scan and came back w/ "P0243-OPEN OR SHORTED CONDITION DETECTED IN THE
TURBOCHARGER WASTEGATE SOLENOID CONTROL" I am wondering if this could be causing the blow by out of my crankcase vent. Also If i was having injector or low cylinder issues wouldn't i notice fuel mileage or loss of power most likely? Any help w/ this issue or other things to look for would be appreciated.
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Old 12-12-2010, 04:02 AM   #2 (permalink)
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no to all questions

get a manometer crankcase pressure test done.

any diesel in motor oil? get an oil analysis ran for fuel contamination in oil on used motor oil sample.
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Old 12-12-2010, 04:03 AM   #3 (permalink)
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no to all questions

get a manometer crankcase pressure test done.

any diesel in motor oil? get an oil analysis ran for fuel contamination in oil on used motor oil sample.
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Old 12-12-2010, 12:52 PM   #4 (permalink)
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Bad injectors dont cause blowby. Trashed turbo could. Do you have low power or misfire?
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Old 12-12-2010, 01:12 PM   #5 (permalink)
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a hung up injector can very well cause blow by when high pressure fuel sprays into the cylinder it washes the oil off of the cylinder walls

dry rings and dry cylinder walls cause heat and friction

wears the cylinder walls and rings and the end result is blow by in that cylinder
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Old 12-12-2010, 01:54 PM   #6 (permalink)
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Quote:
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a hung up injector can very well cause blow by when high pressure fuel sprays into the cylinder it washes the oil off of the cylinder walls

dry rings and dry cylinder walls cause heat and friction

wears the cylinder walls and rings and the end result is blow by in that cylinder
Right, but he wouldnt be complaining of blowby, he'd be complaining of low power and/or a misfire.
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Old 12-12-2010, 03:15 PM   #7 (permalink)
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Right, but he wouldnt be complaining of blowby, he'd be complaining of low power and/or a misfire.
I am going to take from this that you dont have a whole lot of experience with the common rail cummins engines and the common injector failure

there are two ways an injector fails. the solenoid that actuates the injector and allows fuel into the cylinder will stick open and dump fuel into the cylinder. symptoms of this are rough idle, black smoke out of the exhaust and poor fuel mileage.

The second is the most common failure. Dodge dropped the ball with the fuel filtration on the common rail 5.9. Do to the extreme high pressure fuel system any dirt will give you a "sand blasting" effect and wear the seat in the injector. The common rail injectors have very tight tolerances and if they are subject to dirt and water the seat will wear and leak fuel into the cylinder, Unlike the first failure where the injector sticks wide open, the leaky seat may only dump a small amount of fuel into the cylinder and may not effect performance or make the engine run rough do to the air/fuel ratio is not compromised. Symptoms of this can be less noticable. Normally fuel in the oil and white smoke on start up are the only signs of a leaking injector.
Over time the leaking fuel will wash down the cylinder wall and start to wear the rings and cylinder wall like was mentioned before.

So you may have blow by with out any loss of power or miss fire.
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Last edited by Jervis; 12-12-2010 at 03:18 PM.
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Old 12-12-2010, 07:08 PM   #8 (permalink)
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another less common HPCR injector failure is a split blown apart nozzle or split injector body, usually from running rail over Bosch/Cummins specs. capping RPV protector is a common cause
injector nozzles going through a cyl. are not a pretty sight.
ya play, ya pay.

stock turbo failures seldom take out stock common rails unless the ECM protection schemes are bypassed on purpose. just make a hell of a lot of noise and a mess of the intercooler or cat converter when they go kaboom
shiite does happen though occasionally, if the engine back sucks a piece of blown impeller wheel back into the engine.
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Old 12-12-2010, 11:34 PM   #9 (permalink)
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Jervis the symptoms you described from a stuck injector sound like what i am expeircing. I have black smoke out of the exhaust when i accelerate and also have experienced white smoke on start up. I took the truck to a local shop the other day to have them diagnois it b/c we are pretty good at gas motors but have little experience w/ diesels. They were recommended and supposedly work on cummins and powerstrokes however they didnt have proper equip. for compression tests or any other tests really and really didn't have a clue...so at $90 an hour i picked up my truck and decided to learn as i go. I really appreciate the responses b/c i don't have a clue where to start. By the way my truck is completely stock and we rebuilt the turbo w/ new seals not along ago b/c it was leaking oil.
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Old 12-12-2010, 11:52 PM   #10 (permalink)
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How long did you run the leaking turbo? Engine sucking oil will glaze their cylinders like when a injector fails.
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Old 12-12-2010, 11:59 PM   #11 (permalink)
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not sure to tell you the truth. i use the truck everyday and pretty much drive all day so i probably put quite a few miles on it. Same as this problem...im in my slow season and need to get it taken care of. Im sure i have done more damage from waiting but i guess now i will have to deal w/ it. I am just wondering if i should do a compression test or something else for the starting point to tell if i have a bad cylinder or just an injector.
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Old 12-13-2010, 12:06 AM   #12 (permalink)
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Well the injectors have to come out to do the compression test. So as I'm sure that you've being told that. So I would get it all done at the same time. I was qouted 8hrs to do a c test because it's such a lengthy process.
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