Sudden loss of power s60 D5 '02 170k

[cheshired5]

Originally Posted by Mac940

A little question.
The vacuum drops significantly for a couple of seconds when I release brake pedal then it comes back to normal and stays there.
Is this normal or is the brake booster leaking vacuum on the seal?

The brakes are vacuum assisted so pressing the pedal extinguishes vacuum which takes a few moments to replenish.

Where are you testing the vacuum?

[Mac940]

Originally Posted by cheshired5

The brakes are vacuum assisted so pressing the pedal extinguishes vacuum which takes a few moments to replenish.

Where are you testing the vacuum?

Well, that's what I thought but checking twice doesn't hurt, just to be sure
Had a look on the engine mount vac pipe this particular time.

[Mac940]

Well it's been quite a while now.
Unlike everyone said it seems to have been clogged map sensor.
Cleaned it with carb cleaner then immediately with electrical cleaner to wash it off (bad on plastic).
I have done about 800 miles since I've done it, almost all of that time with torque on and the engine is maxing out at 16.6/30.8 psi.

Thanks for help everyone, it's much appreciated, as always

[annvlas]

My volvo v70 keeps losing power.changed the filter but still happening any idea what itmay be.
Thanks