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Discussion Starter · #1 ·
For most of its short life my MR FQ-320 has never felt as if it's hitting the boost properly. On one of it's many visits back to the dealers, they claimed the actuator linkage was seized and they'd adjusted it (it felt a bit better after this, but not a huge difference).

It went in for its 4500 mile service a couple of weeks back and I asked them to check the actuator again. They claimed it was fine, but when I got the car back it felt much quicker. Seemed to hit the boost earlier and hold it much better. I thought perhaps they'd inadvertently freed something up whilst checking it.

So I was one happy chap...until today. Hadn't used the car in a couple of days, and now it feels dead slow again. I'm sure you can't hear the turbo whistling up as loudly either.

I've read that seized actuators are common on the earlier Evos, but anyone heard of it happening so quickly on an 8? I'm seriously p*ssed off with the car now. Taking it back to the dealers doesn't help, as they don't seem to have a clue. Is there anyway of checking if the actuator has seized again, without taking bits apart?

Failing that, anyone know of a decent independent Evo specialist around Essex who could take a look? Any comments or advice gratefully received.

Cheers,
Steve.
 

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HI JTAI170 , A TRICK I USE TO TEST ACTUATORS IS TO MAKE A TEST RIG USING A FEW AIRLINE FITTINGS , A REGULATOR AND A CHEEP AIR LINE PRESSURE GUAGE TO MAKE A CONTROLLABLE AIR SUPPLY. SIMPLY REMOVE THE FEED PIPE TO YOUT ACTUATOR, CONNECT THE OUTPUT SIDE OF YOUR RIG TO THE FITTING AND THEN SLOWLY WIND AIR IN THROUGH THE REGULATOR WATCHING THE PRESSURE ON THE GUAGE AND CHECK WHAT PRESSURE THE ACTUATOR STARTS TO MOVE AT ,IF AT ALL . THE PRESSURE ON THE GUAGE SHOULD BE ABOUT 8-12 PSI WHEN THE ACTUATOR STARTS TO MOVE (DEPENDING ON THE SPRING IN YOUR ACTUATOR) PS.. BE CAREFULL NOT TO BLAST FULL AIRLINE PRESSURE INTO YOUR ACTUATOR.
ALSO JUST A THOUGHT IF YOU JUST WANT TO SEE IF IT IS SEIZED IT MIGHT BE WORTH TRYING ANY SOURCE OF AIR TO TRY IT EG, A FOOT PUMP OR TYRE INFLATOR ETC . MIGHT BE WORTH A TRY.
 

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If your accuator has seized the chance is that it will seize shut, thus not opening and producing more boost not less, I guess it could seize open but I would have thought the constant pressure of the spring would shut it and then after a couple of days it sticks :shrug:
 

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Discussion Starter · #6 ·
Thanks for the replies.

Ok, newbie question...Where's the actuator situated on the MR? Do you have to go in from underneath?

Also, don't suppose anyone knows of an idiots guide to fitting a boost gauge?

Cheers.
 
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