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-   -   Engine 850: B5234TR/2.3/20v/T5R: T-5R boost gauge (https://www.volvoforums.org.uk/showthread.php?t=294860)

GMC May 17th, 2019 23:47

T-5R boost gauge
 
Where does your boost gauge needle go to on your T-5R?
Mine goes off the scale....way off, about 5mm beyond the end of the scale! I'll try to get a picture when I'm out on Sunday.

When on full boost it pulls like a train, but when on full boost for a few seconds, always in 4th or 5th gear, it'll suddenly cut the boost which makes me thinking its over-boosting because maybe the boost sensor (TCV) is faulty?

It never happens in 1st, 2nd or 3rd gear as I need to move up a gear before it occurs.

I'm thinking about temporarily fitting a scaled boost gauge to see how much boost its actually generating!

Any thoughts would be appreciated

winsox May 22nd, 2019 18:56

Quote:

Originally Posted by GMC (Post 2521447)
Where does your boost gauge needle go to on your T-5R?
Mine goes off the scale....way off, about 5mm beyond the end of the scale! I'll try to get a picture when I'm out on Sunday.

When on full boost it pulls like a train, but when on full boost for a few seconds, always in 4th or 5th gear, it'll suddenly cut the boost which makes me thinking its over-boosting because maybe the boost sensor (TCV) is faulty?

It never happens in 1st, 2nd or 3rd gear as I need to move up a gear before it occurs.

I'm thinking about temporarily fitting a scaled boost gauge to see how much boost its actually generating!

Any thoughts would be appreciated


Id check the waste gate actuator pipes and connections onto the TCV. They are know to rot and will give you the issue you are having.

Uncontrolled boost with the possibility of a bent rod at low RPM

GMC Jun 23rd, 2019 22:41

Thanks again Winsox. Sorry for the delay responding, I've be so busy with work I've just made it back into the garage today! You were spot-on, both pipes running to the actuator & turbo had seen better days. Replaced both and things are back to normal!

winsox Jun 23rd, 2019 22:43

Quote:

Originally Posted by GMC (Post 2530950)
Thanks again Winston. Sorry for the delay responding, I've be so busy with work I've just made it back into the garage today! You were spot-on, both pipes running to the actuator & turbo had seen better days. Replaced both and things are back to normal!

Glad u got it fixed !


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