1997 v70r if i (accelerate)hard it loses power

chuffin hell · Post by **chuffin hell** » 16 Jun 2015, 13:41

Ps it hurts me spine wen I keep me foot down

Post by **scot850** » 16 Jun 2015, 14:37

Hi Adam,

You really are having 'fun' with this aren't you!

I still suspect one of the 3 items I originally suggested are the root of the problem, or a vacuum leak. The symptoms all point to the problems of a vacuum/pressure leak, or fuelling problem.

I hate to say to go check all these again, or substitute known good parts, but the TCV valve not holding vacuum/pressure would give this type of symptom, as would the turbo by-pass valve (or CBV). Try to pull and hold a vacuum on the CBV as they do spilt. Last guy I worked with on this found even though he had checked it, it was the problem.

Also check around the fuel tank area for split pipes preventing a steady fuel pressure under load. I have got the full rear sub-frame out of my car, and you would be amazed at the tired parts/pipe in there. Some like the fuel lines look mostly good but are being replaced as they are heavily corroded on the metal bends on the ends.

I'll be in Scotland for the next week, but will check in to see how things are going.

Neil.

chuffin hell · Post by **chuffin hell** » 16 Jun 2015, 15:17

Thx Neil I will go through it again over the weekend not sure I've mention but it has been chipped about 340 bhp
I've just order lots of various bore size vac pipe and will redo all one by one at weekend
The tcv with 3 pipes on it is it on any other car I can take it from ? Thx again Adam

Post by **FLXC90** » 16 Jun 2015, 16:38

+1 to Neil, sounds like a boost surge/dump or fuel starvation.
Is there a screen at the inlet to the pump/pumps that could be clogging?
Since it does build boost even if intermittently I would steer away from vacuum lines and suspect control devices (TCV/CBV etc)
Since you are in UK, is car FWD or AWD? (FWD less fiddly bits in fuel tanks)

chuffin hell · Post by **chuffin hell** » 16 Jun 2015, 16:42

Hi fwd
Fuel is ok pressure wise wen stationary not sure wen drivin

chuffin hell · Post by **chuffin hell** » 16 Jun 2015, 16:50

But I am replacing all vac pipes and inter cooler pipes and will check valve with 3 pipes connected to it also check fuel pressure again

Post by **scot850** » 16 Jun 2015, 16:58

I am not 100% sure but I believe all first gen v/s70 turbos use the same tcv. What boost are you running. If you ate running more than 14psi the standard tcv can"t cope. You will need an HD tcv from IPD or ARD. They can deal with upto 22psi. I am running 18-20psi an 312bhp/300ft/lb torque and had to do to that. Also you will meed nearer 60psi fuel pressure for what you are running. What chip are you using.

Neil

chuffin hell · Post by **chuffin hell** » 17 Jun 2015, 10:32

Hi Neil I've put half tank fuel in and it runs lot better still cuts power but not as bad

Post by **abscate** » 18 Jun 2015, 03:25

chuffin hell wrote:Thx Neil I will go through it again over the weekend not sure I've mention but it has been chipped about 340 bhp
I've just order lots of various bore size vac pipe and will redo all one by one at weekend
The tcv with 3 pipes on it is it on any other car I can take it from ? Thx again Adam

If it's been chipped for higher horsepower I'm guessing you need a different TCV than stock. You might be simply blowing off the waste gate ..that would explain the symptoms. This is out of my realm of expertise, though.

chuffin hell · Post by **chuffin hell** » 18 Jun 2015, 06:51

Took fuel pump out and wacked it about abit re fitted and loads better no kangaroo while acceleration until I went up hill and accelerated slight stutter occured
Is there a pressure valve on fuel line like the cosworth has on the fuel rail ?

1997 v70r if i (accelerate)hard it loses power

Re: 1997 v70r if i (accelerate)hard it loses power