3 replies to this topic

[nedro018]

i have a 95 NA. this sensor came out of the airbox and apparently operates the air vane to open/close off the warm air supply from the exhaust. this one's not working, it's stuck to only accept warm exhaust air all the time.

i was told by one that's it's inop on 95% of the 850 NA's out there and to just leave it off because engines prefer cold air anyway. he said to lock the vane toward the fresh air side because fuel economy will be better (though warmups will take longer)

i was just wondering what the name of it is and if there's a way to unfreeze the piston.

thanks.

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[Keaton85]

Just a vacuum actuated diaphram, not a sensor. Also, I would take that advise and do just what was stated. Although if you really want it to function then soak it with PB blaster or get another used unit.

[Bah]

What he said above, except, on 850's it is infact a thermostat. On 98 s70s they switched to vacuum. The 'piston' or whatever you would call it, expands with heat and will apply pressure to open the flap. when its cold the flap is closed and you get heated air off the exhaust manifold.
If you live in the arctic or very cold climate, then i would say buy a new one.

http://www.___.com/f....php?f=1&t=8830 shows you the dowels method, the simplest. The best method is to take the bottom of an 850 turbo airbox. The next best solution is to get a dremel or whatever to remove the flap, close it off etc...but the bottom of an 850 turbo airbox is just oh so much cleaner lol...

If you should need or want to replace it, look on FCP or wherever, as they are around 25$.
http://www.ipdusa.co...-thermostat-p80

The dowels method will hold you over for a long time with no issues, but, is by no means the best route, just the quick fast fix that'll last years

you gotta put in mattsvolvosittee since for some reason the forum is still filtering it lol..but if you go there you will see pictures of the dowels

[nedro018]

thanks so much both of you for responses.

mine in fact does NOT have the vacuum. which is prob why it failed. other 95-97 NA owner's out there: beware, yours is probably shot too! your engine is prob intaking pure exhaust air for its air supply! no wonder my airbox was so dusty and my mileage in -town with light foot was 18-19 mpg rather than 22.

im taking the advice to leave this thing out of the circuit. i live in CO so i dont need it anyway (for cold starts); what i do need is constant supply fresh, dense cold air to increase fuel efficiency while gas is close to 4$/gal rather than a cheesy valve to fail closed, giving me hot, dirty exhaust air.

i was in the junk yard today and saw a 94 with only a 1-way tube to pipe in fresh air (only) to the air box. i took this one to use.

before i found this 94 part, i had packed about 4 thick washers into my other tube's actuator piston to hold the piston in a position to intake only the fresh air.th

thanks again for responses.