V7 boost issues. Any ideas?

[dnsn]

Just putting it out there to see if anyone possibly knows why my cars doing this. Occasionally when I\'m driving I\'ll notice that my car feels sluggish and lacks the go. I\'ll come on boost to check what it\'s running and it won\'t spool up past 7/8psi, where as my car normally likes to run anywhere between 13-16psi.

When this happens I normally just pull over, turn the car off, turn back on and I\'m away! Boost is back!How ever, last week this wasn\'t the case. It wasn\'t till later the next day my boost actually came right .

I\'m running just the factory boost controller, no tap or nothing. I\'ve checked and listened out for vacuum leaks but can\'t see/hear any.

Just seeing if anyone has any idea why my cars possibly doing this?

[syphe]

can you get access to a code scanner or vagcom cable to scan for codes? There may be a code being thrown which is causing it to go into a limp mode.

[dnsn]

I\'ve got an OBD2 tool and it\'s not throwing any codes that my tool could detect (not a expensive tool so could be crap) I\'ve picked up codes before but didn\'t get any when it\'s gone into limp mode

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[Pappu1]

Wat area u in?

Are there any leaks etc u can notice

Maybe reply all hoses and electrical plugs

Does the check engine light ever come on

Wat mods hav u got

What fuel do u use

Clean the boost solenoid as a precaution anyway and its lines

Is it a sti

[Rosssub]

 SP00N said:

Clean the boost solenoid as a precaution anyway and its lines

+1, Boost Solenoid might be sticking shut (gunked), causing Waste Gate Spring Pressure when it does. (not bleeding)

[hijacka]

I\'ve seen faulty afms do this

[ben-jamminn]

 hijacka said:

I\'ve seen faulty afms do this

I had this in my old V7 STi - AFM giving false readings, ecu seeing too much knock as a result and cuts boost (i.e waste gate pressure 7ish PSI) mine didnt throw any codes either..

See if you can find another AFM to try out

[dnsn]

 ben-jamminn']

[quote name='hijacka said:

I\'ve seen faulty afms do this

/quote]

I had this in my old V7 STi - AFM giving false readings, ecu seeing too much knock as a result and cuts boost (i.e waste gate pressure 7ish PSI) mine didnt throw any codes either..

See if you can find another AFM to try out

This sounds almost sounds identical! I\'ll try cleaning the afm and/or another one

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[dnsn]

 SP00N said:

Wat area u in?

Are there any leaks etc u can notice

Maybe reply all hoses and electrical plugs

Does the check engine light ever come on

Wat mods hav u got

What fuel do u use

Clean the boost solenoid as a precaution anyway and its lines

Is it a sti

I use bp 98, and on rare occasions full force 10( only when I desperately need gas). Pretty stock engine, just has a sti genome muffler and a boost gauge. Have checked all lines and seems to be okay with no leaks

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[ben-jamminn]

see the thread from when I had this issue http://www.clubsub.org.nz/forum/index.php/topic,32969.90.html

the last few pages are relevant

[dnsn]

 ben-jamminn said:

see the thread from when I had this issue http://www.clubsub.org.nz/forum/index.php/topic,32969.90.html

the last few pages are relevant

Thanks! I\'ll have a read up now

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