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The mkiv Supra Owners Club

Car doesnt build boost ? Help !


ronzilla

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Hi guys,

 

I took the car out today and noticed that the car doesn't build boost on WOT (wide open throttle).

 

The car can build boost on half a throttle to like 5-8psi but as soon as I plant my foot down the boost just went down straight to 0psi.

 

I tried to put it on TTC and that didn't help either.

 

And it is important to note that the car doesn't smoke whatsoever and drives perfect off-boost.

 

I only bought the car like 3 months ago and its giving me a problem already -_-

 

Any idea when do I have to start ?

 

Thank you !

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If TTC not helping then you have a vacuum hose leaking somewhere or a failed pressure tank.

 

Check the ones leading to the IACV VSV, very common one to give issues.

 

With the age of these cars, I would replace all the vacuum lines, pressure tank & VSV's.

 

Expoensive exercise, but worthwhile if keeping the stock twins. Trying to find & resolve issues 1 by 1 is a pain.

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