Hiya folks

 

I had a major turbo blow out  before christmas, finally got the car up and running again and its running pretty good, cept for a weird problem. Sometimes when i drive the car it runs absolutely perfect, however if i stop the car and start it up again, sometimes it stutters a bit around 1100rpm. i stop the car and start it again, no stuttering around 1100rpms, but instead at 1900rpms. It seems to be at either 1100 or 1900, nowhere else. The car has been sitting entire winter unused, it was also sitting with almost empty tank of diesel. I have now run some injector cleaner thru it and of course fresh diesel, but it doesnt seem to change the weird stuttering. If it was a fuel starvation issue, or water in the diesel, i would assume it would be worse at higher revs?

 

I have no fault codes, used vcds to look at airflow, injection etc and everything looks normal.

I have also cleaned most of the sensors, checked the airfilter, checked the vacuum if they actuate the actuators like they should and as far as i can tell everything works.

 

When the turbo blew, i got quite a bit of oil in the exhaust, im wondering if the oxygen sensor is really dirty, but im not sure if this would cause this weird issue. I can not find anything in vcds to look at the value of the oxygen sensor, or is it just me not finding it?

 

Something else im overlooking here? Suggestions is greatly appriciated, Thanks in advance

Could be a loose injector connection influenced by temperature and vibration, easily fixed.

 

Happened to me and it took months before it was literally like riding a bucking bronco before a fault code showed as cylinder 2 misfire IIRC.

Thanks for your answer

 

To check the injector connections i have to take off the valvecover right? and how to fix them, just squeeze them on a bit harder?

To check I've posted the procedure sometime ago and there's videos on the tube.

 

Just unscrew injector harness from head and with a multimeter probe the pins checking each injector's resistance, they should all be equally low with higher values pointing to the poor connection.

 

It should be noted that this diagnosis is not 100% foolproof as temperature and vibration influence any weak connection on the injector so everything may test good while the engine is cold/static.

 

You are correct, just whip the cam cover off and squeeze the female spade connectors on the harness for a tighter fit.  You'll need to be creative to access the cover bolt obscured by the EGR and expect the plastic plugs on the harness to crumble-place a rag under whatever you're working on to prevent debris falling into the depths of the engine.

Thank you, will do a check on it

Did you manage to solve this?

 

I'm getting misfire around 2000rpm, on partial load (sometimes).

 

I've changed the injector loom, which solved it. Then it's been warm here (30+ degrees), and the misfire is on/off back again.