over boost code

**expolicev70t5** · Saturday 14th November 2015, 17:11

I keep getting an over boost code from time to time , and when it does it goes into no boost mode. This seems to have started when I had brand new turbo fitted. First thought's was TCV but I've now replaced that with ipd TCV and still getting the error. If I reset ecu it behaves it's self for a week or so then back comes the over boost code, any one got any ideas? My next thought was map sensor. car isn't showing any warning lights on dash.

**expolicev70t5** · Sunday 15th November 2015, 19:04

Anyone got any ideas?

**Kingsford G** · Monday 16th November 2015, 09:33

Have you checked the vacuum one way valves,mine was shot causing an overboost.

**expolicev70t5** · Monday 16th November 2015, 10:27

Originally Posted by Kingsford G

Have you checked the vacuum one way valves,mine was shot causing an overboost.

No I haven't checked those, how do you go about checking them?

**Kingsford G** · Monday 16th November 2015, 19:21

I believe there are 2 of them,one is under the inlet,they called a one way valve for a reason mate,should only let the air one way.Also check all the vacuum pipes carefully,sometimes the is a hole under a pipe.

**LeeT5** · Monday 23rd November 2015, 22:33

One valve under inlet manifold, the other is on the right side of the engine (viewed from the front) in the collection of tubing. It's difficult to get to without removing the air box and associated induction tubing. Don't bother checking as they can be intermittent. Just buy two new ones from Volvo. They now sell them individually.
When I replaced mine, I gained 2 psi.

**Kingsford G** · Tuesday 24th November 2015, 00:31

Originally Posted by LeeT5

One valve under inlet manifold, the other is on the right side of the engine (viewed from the front) in the collection of tubing. It's difficult to get to without removing the air box and associated induction tubing. Don't bother checking as they can be intermittent. Just buy two new ones from Volvo. They now sell them individually.
When I replaced mine, I gained 2 psi.

True,they can be intermittent.The Volvo ones were near 20 quid each so I bought 2 from Merc dealer for less than that.Someone had a part number on here.

**LeeT5** · Tuesday 24th November 2015, 08:10

Originally Posted by Kingsford G

True,they can be intermittent.The Volvo ones were near 20 quid each so I bought 2 from Merc dealer for less than that.Someone had a part number on here.

That would be me! They are on my thread mate.

**kmb** · Tuesday 24th November 2015, 08:42

Do these same valves exist on the 850?

**M-R-P** · Tuesday 24th November 2015, 09:16

Might be worth replacing the boost pressure sensor on the intercooler outlet too.

**expolicev70t5** · Tuesday 24th November 2015, 10:28

Originally Posted by M-R-P

Might be worth replacing the boost pressure sensor on the intercooler outlet too.

I had that lined up next as part of replacing intercooler and pipes with D088 set from PFS, MAP sensor (boost pressure sensor) is £98 for genuine item through PFS

**LeeT5** · Wednesday 25th November 2015, 08:09

Originally Posted by expolicev70t5

I had that lined up next as part of replacing intercooler and pipes with D088 set from PFS, MAP sensor (boost pressure sensor) is £98 for genuine item through PFS

Rip off!

It's £76 retail from Volvo! Part# 31355463. Trade discount will get it down to £66.88 plus VAT.

**LeeT5** · Wednesday 25th November 2015, 08:12

Originally Posted by kmb

Do these same valves exist on the 850?

I think they do, not sure where thou?

**Kingsford G** · Wednesday 25th November 2015, 20:02

Originally Posted by LeeT5

That would be me! They are on my thread mate.

I believe it was lol

**Ric@rdo** · Wednesday 25th November 2015, 20:15

Originally Posted by Kingsford G

I believe it was lol

I also got the part number from Lee on his thread. Replaced them last month

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