2003 2.0t5 boost problem

marjoT5 · Post by **marjoT5** » 24 Mar 2014, 07:44

hi all, i'm new here and have a problem with my car
is there someone have an idea why the boost of the turbo go's up and down while driving,if you drive without turbo there is no problem,but if you give more gas and the turbo get on, is it in pieces he go forward,so the boost go up and drops,up and drops and so he go forward,like you give gas and let the pedal go,give gas and let go,i have this problem now fore one year
on the computer there is no fault,whe have change the valve on the turbo.
is there someone that now this problem?
sorry for my englisch

thanks

marjoT5 · Post by **marjoT5** » 24 Mar 2014, 13:52

the pressure of the turbo is directly gone , but if you push on the pedal of the brake,you can hear pressure escape,so is the fault the brake-power thing ? i dont now the word in englisch
if that's broken and loose pressure,also for the turbo there is no pressure,no?
someone ?

Post by **jimmy57** » 24 Mar 2014, 14:07

CHeck all the hoses and connections for intercooler for leaks.

marjoT5 · Post by **marjoT5** » 24 Mar 2014, 15:24

we have checked the hoses and other, can it be the boost control solenoid ?

alron400 · Post by **alron400** » 30 Mar 2014, 05:26

Hi Alron400 here,

1 The Volvo Engineers have a system that turns the Turbo off after a short period and this can sometimes be felt as a "loss of Turbo" and as a result the waste gate on the Turbo is opened and this could be the sound that you refer to.

2 Some of us who want the Turbo to "Stay On" just simply bypass this system and then enjoy full boost without dropping off at all.

3 There needs to be a lot of care installing anything that will "Hold Boost On" as it can do a lot of damage if not measured out is small doses.

4 Good Luck with your issues.

Catch you on The Open Road.