Sveriges Volvoforum

Heysan Volvo-Folk

I need help sorting out my engine problem. I have an 850 t5 2.0 the oil is smelling of gas and when I drive the car there is a point on the gaspedal were nothing happens at all. When I give it full speed first second it´s all good when I reach third gear the engine cut the fuel or ignition not a nice feeling. The sparks is sooty and they are new orginal volvo for the B5204t engine.

I did a compression test all five were around 12 diffrence smaller than whats "criminal"

I have checked all the vacumlines several of times, I have complete new ignition system cables+rotor+cap and new fuelfilter+new Maf+cranck case sensor+camshaftsensor shifted+new used fuelpump and the pressure is ok after the book I even shifted the fuel pumpregulator...

Next step is to take the injectors out and see if they are dripping, but I mean would it be possible that all five is bad?

I would take the intercooler down and have a look at it to, try with blowing air into it and check for leakage...

The errors it gives is 414, 231


Any good sugestions I would be happy to hear from you Guys

Hilsner fra en Mekaniker i København

Fault codes according to Haynes manual:

4-1-4 To high boost pressure
2-3-1 Long term mixture to rich or to lean on part load

One problem you have is overboost. Thats why the engine cuts out in third gear. The ECU controls the boost with some sort of valve and 3 hoses connected to the waste gate. Maybe the hoses are mixed up? Or maybe the overboost pressure switch is faulty?

Best regard Hasse