Airbox thermostat failure...

Post by **polskamafia mjl** » 05 Apr 2009, 15:36

If the thermostat in the airbox is broken or removed won't that set off the check engine light or anything?

2volvoken · Post by **2volvoken** » 05 Apr 2009, 16:15

I have removed the t-stat, and using a dremel tool all of it's mounting plastic, with no ill effects. The car runs great! I live in northern Indiana and ran my '93 in -30 degree temps and It ran great......I did not use foil I just used a sheet metal screw to screw the door shut in the cold air position.

Craigd2599 · Post by **Craigd2599** » 12 Apr 2009, 17:35

Okay...second tank of gas through the car after the airbox change...23.3 MPG. I have owned this car since July '08 and NEVER got more than 20 MPG around town. That's up 3.3 MPG. Wonderful!

Post by **tjts1** » 12 Apr 2009, 17:55

Excellent

Is this car manual or automatic? I never logged my FE before and after the airbox fix so its nice to get some solid data.

Craigd2599 · Post by **Craigd2599** » 12 Apr 2009, 20:21

Automatic N/A 155K miles, no alterations to anything

jasonaileo · Post by **jasonaileo** » 14 Apr 2009, 06:27

Just a little FYI on this topic. I have a '99 V70 non-turbo and I did the above mentioned mod. I used a small piece of 1/2" copper pipe about 1" long (length measured to fit/jam tight into the air intake). My mod worked great at forcing open the fresh air intake and forcing closed the return exhaust intake. About a month or two after the mod, I got a check engine light (CEL). I had the codes read at AutoZone and got a P0420 Rear Bank Sensor Efficiency Error. I think that by closing the return exhaust may have created a backup where the excess exhaust that used to cycle back into the air intake was now forced past the rear O2 sensor and triggered the CEL. I took out the mod, reset the CEL and it has not come back on. One way around this may be to simply leave off the exhaust return line from its connection into the back of the airbox. This of course would be just releasing the exhaust into your engine compartment and the environment. There may also be an issue with exhaust pressure or something, but I don't know enough about this stuff to tell you if it would be harmful in the longterm. Your call.

Post by **misha** » 14 Apr 2009, 09:03

There is no exhaust there,it's just HEAT (hot air)from exhaust pipe.

Exhaust gases do not enter in air box this way.
A little part of exhaust gases is comming in air box via sas valve(air pump component).
I think that you're completely missunderstood this.

Craigd2599 · Post by **Craigd2599** » 14 Apr 2009, 09:46

Wait...you mean my car isn't now running on exhaust gas? Here I thought I was on the cusp of true perpetual energy. I want my piece of tin foil back.

Post by **tjts1** » 14 Apr 2009, 11:59

Post by **misha** » 14 Apr 2009, 12:10

Are you telling me that thru silver pipe which goes into air box flows exhaust gases????

Airbox thermostat failure...

Re: Airbox thermostat failure...