Breather problem

[Big Dean t]

Please look at picture....

Why is it when I connect the breather pipe to the dump valve or put finger over pipe tick over goes really low like it wants to cut out then shoots up again and dose it a few times before coming steady??

And how can I fix it ?

[savage bulldogs]

The reason the revs change is when you take the vac line off the top of the dump valve. The vac line end is open allowing unmetered and unfiltered air to be sucked into the inlet which affects the mixture /idle

What is the issue or fault your trying to find?

If it's not broke .....upgrade it

[Big Dean t]

When you Rev the engine nearly stalls and then goes up and down before it ticks over stable

I've put a brand new MAF sensor as was told to try that first

[savage bulldogs]

What year / model is it and Have you had the ecu codes read ?

If it's not broke .....upgrade it

[Big Dean t]

Impreza

Year 2000

2 ltr turbo awd

[Scoobyghost]

Hi, I see you're in Kent. If you're local I'd gladly pop down or you can come to me or even pop to one of our monthly meets for some hands on fiddling.

[stants]

you can come to me or even pop to one of our monthly meets for some hands on fiddling.

[emoji667] this [emoji23]