v50 2.0D (d4204T) stutter on idle
 

short introduction since i'm new here.
Frank
30years
Holland/Netherlands

we bought this volvo v50 2.0D (build in '04) beginning this year.

actual ODO KM's : 377###

issue :
on cold engine start is like an old 1990's diesel,
engine seems to have the famous diesel knock, but only on cold engine start (after driving about 200meter its gone)
but what is still present after this point and also on a hot start is a slight hick-up /stutter at random moment, feels like a misfire on an petrol engine.
need some advice and help on sorting this out.

here is what is been changed (scheduled maintenance) :
@ 366###km :
timing belt kit including waterpump
air filter
cabin air filter

@ 373###km
diesel fuel filter ( almost no air bubbles in the clear line after filter, just 1 or 2 every once in a while, can't get it better then this)
oil + filter

did some trouble shooting but definitly nothing changed when i tried the following things
used a blanking plate for EGR, + egr connecter disconnected, nothing changed
unplugged glow plug connector, nothing changed.

besides the egr fault code being activated due to blanked of EGR no codes seem to be stored.

I'm not familiar with this car, diesels being a bit rare in USA. But diesels in general are very sensitive to fuel delivery. Keeping air out of the fuel line is essential. It seems like the air bubbles might indicate a bigger problem. I know many Volvos use two fuel pumps, one main pump and also a "pre-pump" in the tank. If there is any kind of leak, there will be serious performance issues, sometimes only when the fuel is below half a tank or some other odd specific circumstance. Does the car run better if the tank is topped off?

There's also the possibility that the injectors need to be reconditioned. They may simply be overly restricted or no longer atomize the fuel well enough to burn clean. Getting near 400000 km would make that seem fairly likely.

as far as my knowledge goes about this car is that it only uses 1 pump, (the same one thats boosts up the pressure / a.k.a. high presure pump).
this works as a suction based pump (once there is to much / no fuel in the line it simply does not have the power to suck any fuel to the engine/injectors).

i certainly don't hope its about the injectors since each one is around 240 euro's per injector to get the refurbishd.
my mechanic is going to do service the car around next week. replacing all 4 of the copper injector seals, and on my request he is also going to change the 4 glow plug for new plugs.
while he is at it he will also clean the EGR valve (as per my request). (already ruled out EGR & Glow plugs by blanking of and un-plugging the connector but does not hurt to get it done since i already bought the stuff for it).
(the reason for changing out the injectors copper washer/seal ring is that 1 of them is leaking a bit to the outside, thus causing a foul odor when starting to drive with windows open on cold engine)

another tech guy that only services volvo's, says it is possible that my hugh pressure fuel pump is starting to show signs of wear, altough it does deliver enough fuel most of the time, it is possible that it lacks some fuel at moments.

i certainly hope after the scheduled service my mechanic is going to peform on it. that this problem is solved.
recaintly spoke to a guy that had the same issue a couple of years ago with his car.
turned out that a leaking copper seal/washer that was around the injector turned out to cause these exact same symptoms.

Good luck. Always rule out the simple cheap things first before you take it to the dealer for the big expensive repair. Hopefully it's just the little ring.

finally my mechanic has some time. he is going to remove the injectors, then i'm going to get them cleaned and testes by a diesel tech company. after that the injectors are going to be reinstalled with new copper washers/rings. i'm still hoping it is just one of them rings not giving a 100% seal. but assuming the worst (one or more injectors not working as they should). i've bought the car this way and have already done about 45000km with this issue. need to save up a lot more money if the injectors are really bad to get new units. damn things are nearly impossible to find ( 36000321 & 36000320) are the ones currently installed, i was advised to stick to that type, i am not able to find those, not even on ebay. however ...
36000315
36000317
36000318
36000319
are easy to find and a lot cheaper to, does anyone know if those fit and don't give trouble ?

thanks anyone

mechanic removed the injectors, today i took them to a specialist in diesel engine (pump & injectors). this afternoon i will know more.

will post an update soon :)

Injectors all 4 are changed.
Fuel volume valve, died about a 1000miles after that. Installed another one.
Still rough idle on cold /1st engine start.

Different question is
What does reset adaptation values do ?
And what do i need to do to complete this adaptation re-learning Curve/procedure.

Allso somewhere IT says that after fault tracking and replacing faulty parts, thus updating that the fault is gone/remydid. IT says that this cycle is also tot be fine automaticly. (Of do you need to click that for yourself?)

Solved?
 

Have you solved the problem? Have similar difficulties on starting it in the cold weather.