Volvo 850 power loss under hard acceleration Topic is solved

Jaumme · Post by **Jaumme** » 29 Jan 2019, 13:29

Y squeezed the return Lane And the pressure kept the same, i think the pressure rise when i start the engine is caused because the alternator is giving a little more voltaje than batery does?

Sommerfeldt · Post by **Sommerfeldt** » 29 Jan 2019, 14:15

Jaumme wrote: 29 Jan 2019, 13:29 Y squeezed the return Lane And the pressure kept the same, i think the pressure rise when i start the engine is caused because the alternator is giving a little more voltaje than batery does?

That kind of brings us around to the pump again. Pressure should climb quickly with return line closed. If it doesn't that means replace pump.

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Post by **abscate** » 29 Jan 2019, 23:25

Pruned some posts that definitely were running low on lubricant.

Thanks for self moderating, people.

Jaumme · Post by **Jaumme** » 01 Feb 2019, 14:20

Just replaced the fuel pump today And no more Power loss.
Thank you all for the help

Post by **misha** » 01 Feb 2019, 14:59

I guess that pdf narrowed it down.

Sommerfeldt · Post by **Sommerfeldt** » 03 Feb 2019, 22:18

Jaumme wrote: 01 Feb 2019, 14:20 Just replaced the fuel pump today And no more Power loss.
Thank you all for the help

Nice! Clemens got it spot on from the get-go.

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Jaumme · Post by **Jaumme** » 07 Feb 2019, 06:41

Another question, is that boost normal or low? If its los what can cause It?

Cookeh · Post by **Cookeh** » 07 Feb 2019, 08:39

That's about as far as mine goes on the boost gauge, so Id be interested in knowing if its normal too!

Post by **Clemens** » 07 Feb 2019, 12:34

Sommerfeldt wrote: 03 Feb 2019, 22:18
Jaumme wrote: 01 Feb 2019, 14:20 Just replaced the fuel pump today And no more Power loss.
Thank you all for the help
Nice! Clemens got it spot on from the get-go.

- S

Great! What do I win

Post by **Clemens** » 07 Feb 2019, 12:41

Cookeh wrote: 07 Feb 2019, 08:39 That's about as far as mine goes on the boost gauge, so Id be interested in knowing if its normal too!

That is quite normal for a T5, maybe a bit low. The R models go a bit further. And my T5M goes a bit further as well, but then drops back immediately because it has boost spikes.
you can always shorten the wastegate rod a bit (by like 1-2 turns the max.), but be careful because you can cause harm. Use a vac tool to set the base value of (I think) 1.8 psi for the M4.3 T5s and then shorten by about a turn. This wakes up the brick at low rps/speeds.

Please do some reseearch, I am writing based on my (confused) memories.