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v50 2.0D (d4204T) stutter on idle

  #1  
Old 10-13-2018, 02:13 AM
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Default 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.
 
  #2  
Old 10-22-2018, 03:39 PM
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Join Date: Jul 2018
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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.
 
  #3  
Old 10-23-2018, 02:59 AM
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Originally Posted by eflexter View Post
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.
 
  #4  
Old 10-23-2018, 03:20 PM
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Join Date: Jul 2018
Posts: 87
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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.
 
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