Hi all and best Regards from Luxembourg


let me describe my problem with my V60


Currently I've a VOLVO V60 T4F (Flexifuel ) 132 kw. 1600ccm


The Car dealer nearly get mad, they don't find the error.


what happens.
When the car is off over night of switched of for a longer time with a cold engine, the engine start makes problems.
Means the engine starts immediately but then I get random misfires (Error P300) the MIL is flashing but it's not on steadily.
after 20seconds the error is gone and the engine runs fine.
But when I start and push the throttle a bit more than 2000rpm the error doesn't sometimes even come up.
IMPORTANT: The error doesn't come on LPG only on regular fuel, but in the cold start phase you must drive on regular Fuel.




The following works have been done.
- 2 coils replaced
- fuel injectors checked and cleaned with ultrasound
- spark plugs all ok
- compression excellent
- MAF replaced (problem still persists)
- Checked for Air Leaks (all ok)


the Long term Fuel Trims where at +19%
they are now back to normal means -1% After a 300km Highway drive.


Has somebody had already such an issue?


the mechanic told me the it could be probably somewhere in the Fuel Supply circuit.


means Fuel Pump - High pressure pump
Rail Pressure valve or Rail pressure sensor.


somebody can help?


Best Regards


Frederic

 

Long term fuel trim data at +19% is showing a lean condition. Pushing the gas pedal to correct and not having issues points to vacuum leak.

However, one point of Long Term Fuel Trim (LTFT) is not enough information to diagnose a problem. Fuel trim data is stored in memory by a combination of engine load and revolutions per minute. Short term fuel trim is also important information needed for diagnoses. It also depends on if you are in open loop or closed loop.

I hope everything translates OK.

 

the Short trim goes to 0,0% when Long trim is on 19% - if you sum this up it's still ok because it's still in the Tolerance . (no MIL is coming up) but for sure it's not normal.
The 19% are always in the closed loop. The engine start probs are only in the open loop (COLD)