Peugeot 505 Diesel XD2S dark smoke low power

[Ganztapeugeot]

Hi everybody, I’m new to this wonderful forum and i have some problems with my diesel Peugeot 505 xd2s which hope you can help me, because is driving me crazy.

I bought this second hand engine xd2s which in the first start it work fine with no smoke at all when accelerated, and has a decent power up on hills, so i was very happy with it, always started right away. I forgot to mention that when i first start the engine i step on the accelerator hard i heard a knocking like if it was some valve or an injector knocking, but i step again, again and again i never hear it again. I think maybe is because the engine was stopped for long time.

Now about four month later it has very low power and makes too much smoke, and has a hard idle it bounce too much it sounds like is going to shut off but never do, but it stills starting right away. So i turn the idle speed a little hi and it stops bouncing to much but it stills do. But sometimes when on stop light in idle speed it goes down with a lot of shake, if i touch the accelerator and take my food off very quickly it stops shaking and return to the increased idle speed.

I don’t know what’s wrong with it, no power, too much dark grey smoke, and shaking in idle speed.

i asked a mechanic and it say that is the injector pump that may decreasing pressure, and other guy told me that it couldn't be the pump because or it work or not. He told me that is the injectors that need to be cleaned and recalibrated or changed.

But i guess i will first start in the injectors.

What is the calibration value for the Xd2S injectors?

So i wonder what you guys think may be the problem, could it be compression,

but losing it so fast?

Sorry for my English

Need help please.

[Bean]

Welcome to the forum! Your English is very good - but I am very curious what country you are from... Your car is very nice, but the background is very interesting and I can't figure out where.

Calibration or pop pressure I would suggest setting them to 160 bar, and ensuring the spray pattern on the nozzles is OK, and then you will need to time the injection pump by ear to compensate for the higher pop pressure.

Smoke colours: http://www.dieselbombers.com/general-diesel-related/53737-diesel-engine-smoke-color-what-means-what.html

Basically there are 3 types of smoke emitted from a diesel engine: black, blue and white.

Black smoke:

Black smoke is the most common emitted from diesel engines and indicates incomplete combustion of the fuel. Black smoke causes can vary widely and include ..
· Incorrect fuel injection timing
· Dirty or worn fuel injectors
· Over fuelling
· Faulty turbocharger, or turbo lag
· Faulty or dirty exhaust gas recycling (EGR) system
· Incorrect valve clearance
· Incorrect fuel to air ratio
· Dirty or restricted air cleaner systems
· Over loading the engine
· Poor fuel quality
· Cool operating temperatures
· High altitude operation
· Excessive carbon build-up in combustion and exhaust spaces

Black smoke can occur across the entire operating range, but is usually worst under full power, or during the lag before the turbocharger boosts air supply to match the fuel usage such as in the early stages of acceleration and during gear changes. Moderate turbo lag smoke is acceptable; otherwise black smoke should be hardly visible in a correctly running engine.

Blue smoke:

Blue smoke is caused by engine lubricating oil burning. The oil can enter the combustion chamber from several sources including:

· Worn valve guides, or seals
· Cylinder &/or piston ring wear
· Cylinder glaze
· Piston ring sticking
· Incorrect grade of oil .. too thin and getting past rings, or valves guides
· Fuel dilution of the oil, making it too thin.

Blue smoke is often evident at cold start, which can reflect reduced oil control due to carbon fouling deposits around the piston rings and/or cylinder glaze. Blue smoke should not be evident at any stage.
An engine may burn oil without the evidence of blue smoke, because good compression burns oil quite cleanly, however, it is not acceptable for any new engine, or engine in good internal condition to burn large amounts of lubricating oil.

White smoke:

White smoke is caused by raw, un-burnt fuel passing into the exhaust stream. Common causes include:
· Incorrect fuel injection timing
· Defective fuel injectors
· Low cylinder compression

Low cylinder compression may be caused by leaking valves, sticking piston rings, ring wear, cylinder wear, or cylinder glaze. When white smoke occurs at cold start and then disappears as the engine warms up, the most common causes are fouling deposits around piston rings and/or cylinder glazing.
Continuous evidence of white smoke indicates a mechanical defect, or incorrect fuel timing.

If it were me I would ensure the fuel filter is in good shape, valve clearances are set, and the pump timing is adjusted / advanced since those are the easy ones to do. After that I would have the injectors checked for spray pattern and pop pressures.

Good luck and keep us posted on progress.

Rabin