Volvo 855 tdi no power.

[woollster]

Hi everyone. I am new to the forum and this is my first post. I have a 855 tdi auto which seems to have got slower and slower over the past few months to the point of being not far off undriveable. I have used a scanner on the car with no codes present. The turbo is ok. I have checked vac hoses, intercooler hoses and maf is ok. Any help would be appreciated. Thanks.

[Clan]

Originally Posted by woollster

Hi everyone. I am new to the forum and this is my first post. I have a 855 tdi auto which seems to have got slower and slower over the past few months to the point of being not far off undriveable. I have used a scanner on the car with no codes present. The turbo is ok. I have checked vac hoses, intercooler hoses and maf is ok. Any help would be appreciated. Thanks.

when these cars were current , your problem was caused by an Air mass meter fault .

[woollster]

Hi there Clan. I have opened the top of the air mass meter up and moved the track under the swinging mechanism across a couple of mm already. I have tried 2 other maf's and nothing changed.

[Clan]

Originally Posted by woollster

Hi there Clan. I have opened the top of the air mass meter up and moved the track under the swinging mechanism across a couple of mm already. I have tried 2 other maf's and nothing changed.

Ahh , sorry , this problem was on the later engine with the electronic Air Mass Meter .., back to square one i guess ..

[martin_r_smith]

Have you checked the hose to the map sensor? It comes off the end of the inlet manifold to the map sensor that's located by the drivers side strut tower.

[woollster]

Yes Martin. I have renewed all vac hoses and thats one thing i checked.

[c_lee]

Originally Posted by Clan

Ahh , sorry , this problem was on the later engine with the electronic Air Mass Meter .., back to square one i guess ..

Clan - I'm not aware of that problem so can you please give more info regarding this?

Mine is a 1999 V70 Auto 2.5D MSA 15.8 approaching 211,000 miles.

I presume you mean the MSA 15.8 units.

Thanks - Colin

[martin_r_smith]

When did you last change the fuel filter

[Clan]

Originally Posted by c_lee

Clan - I'm not aware of that problem so can you please give more info regarding this?

Mine is a 1999 V70 Auto 2.5D MSA 15.8 approaching 211,000 miles.

I presume you mean the MSA 15.8 units.

Thanks - Colin

Yes that's the one , The Air mass meter doesn't have any adaption to compensate for wear / deterioration so the signal gets less and less as years go on delivering less and less fuel . You notice it more when pulling away from rest . A new air mass meter transforms it ..

[woollster]

Hi there. I last changed the fuel filter about 100 miles ago. I’ve tried 3 different air mass meters and no change also.