Idiling Problem Solved

[Big 'D']

  frankyboy said:

somebody has said it could be the head gasket

this person is not really reliable but just thought i would ask

not loosing fluid power or oil no smokey exhaust

The common symptom of a head gasket failure is overheating.

Ok by atmospheric I mean it dumps the air to atmosphere, it will make an audible ffttttssshhhhhhh sort of noise when you back off the throttle from being on boost.

What make of DV is it?

It is very common for some types of DV piston to stick open allowing unmetered air into the engine causing a rough idle, also if a single piston DV is fitted unmetered air is allowed into the engine.

Cheers Iain

[arch]

Thought you didnt have an idle problem now only a starting issue

[frankyboy]

  Big said:

The common symptom of a head gasket failure is overheating.

Ok by atmospheric I mean it dumps the air to atmosphere, it will make an audible ffttttssshhhhhhh sort of noise when you back off the throttle from being on boost.

What make of DV is it?

It is very common for some types of DV piston to stick open allowing unmetered air into the engine causing a rough idle, also if a single piston DV is fitted unmetered air is allowed into the engine.

Cheers Iain

its a blitz DV mate

[Big 'D']

  frankyboy said:

its a blitz DV mate

I have encountered the idle problem with a Blitz DV on a local V3 Sti Type R, so it is possible, can you post a pic of the DV also do you know if it is a 2 piston type (I have never looked inside one) , do you have the OEM recirc DV, if so I would fit that and see if your idle issue goes away.

If it is the adjustable Blitz Supersound type, I would suggest adjusting it tighter (making note of where it is set now) to see if the idle gets any better.

Cheers Iain

[Big 'D']

  Arch said:

Thought you didnt have an idle problem now only a starting issue

A sticking DV can also cause starting issues from cold due to the unmetered air getting into the engine so it is worth looking at anyway.

The reason I asked about the DV in the first place is that it is a very common cause for idle issues.

Cheers Iain

[hi_jac]

  Big said:

Well if its a Phase 1.5 V3 (MY97) Impreza please let me know how you get on fitting the 4th bolt as there is NO tapping in the manifold for it

Cheers Iain

Every day is a school day. Why would Subaru do that, where is the logic in that.

[arch]

Jac look at the pics I put up on page 1. Its prob all to do with the redesign of the inlet manifold to allow the intake pipe to run under the manifold to suit a front entry turbo. The way the legs were shaped doesnt lend itself to having a 4th hole. They could have made the flange extend to the fourth bolt position but that would have prob cost an extra 32p

[hi_jac]

Note to myself, refresh the page when i go wondering off for hours