Today I finally decided to fix my boost problem which I started a tread months before...when i was working on my car ...I noticed a check valve that was cracked so now i'm wondering was it the check valve that caused the problem?
Problem is that I had boost in 1 gear but when i shifted after 8000rpm , 2nd gear had 0 psi of boost...
Can somebody confirm?
Where can I buy a new check valve?
Thanks guys...here's the check valve picture...cassser means broken in french.

 

It could have something to do with that check valve, if it looks broken I would definitely replace it, but this sounds like your turbo control solenoid neeeds to be replaced. The solonoid sits on top of your ACV. You can get these from Malloy Mazda or any dealer can order them for you. This might be the problem, but someone correct me if I am wrong.

Bart

 

Yes, if that check valve is leaking, then it MAY be your problem. This check valves prevents pressure from escaping out of the pressure chamber, once you're off boost (i.e. shifting). You need both pressure and vacuum for TCA. Correct me if my assumptions are wrong

 

so should I change my solenoids while i'm at it??? or it just the check valve? whereabout the best prices for a check valve??? and i'm pretty sure my idle problem (600rpm to 800rpm) is originated from that leaking check valve...can somebody confirm?

 

Look. If its broken, replace it, as it wasnt intended so from the factory
Then we'll go step further if you have more problems, ok ?

 

so let's forget about the solenoids...
when i was shifting at high rpm i could notice a high pitch hissing sound....
the check valve is cracked...so it might be it right?
and guess what ...i bought the car from the dealer...there's silicon around the valve....it was already broken...those bastards!