So I was reving my engine, and the turbo kicks in almost immediately. Which is not right.

I remember I did this back a couple months ago, and when I revved the engine, there would be no turbo in the "black" and turbo once it hit the white or at least a louder sound once it hit the white.

Now however, the turbo kicks in immediatly when i'm in the black. It doesn't even go up to the white.

I read the code yesterday, and apparently I have an RPM sensor problem (Crankshaft position sensor). Could the turbo kicking in early be attributed to this problem, or is it an entirely new problem?

 

Possibly if the computer disabled some of the systems due to the code being present.
Also is the boost control valve good.
Do you have higher boost?

 

How can I find out if i have higher boost w/o a boost guage?

I think my turbo kicks in fine when i'm driving though, but i'm not compeltely sure.

 

But up top you said you have a guage on the dash. If you had more boost the guage would go higher.

 

Ooh. Gotcha. I can hear the turbo spooling hard when i'm reving but the guage doesn't indicate that i have higher boost.

On the highway, the car seems to be normal, with the guage going to white and stuff.

P.S. I thought you were referring to a boost guage which tells me how much boost I got. But I gotcha now.

 

I would check the Vaccum hoses between the boost control valve and the turbo.

 

Could this be that my broken RPM sensor is making the turbo kick in early?

The RPM sensor is sending incorrect info, and the car thinks that it's time to boost/

Btw, how hard it is to replace the RPM sensor/Crankshaft position sensor and how much would this part cost?

 

Pretty easy to replace not sure about prices though.

 

^Ok. I was talking to my friend. Could it possibly be the plugs? (I'm reading a transmission code 3-1-1 which has to do w/ the RPM sensor). My friend said it might be the plugs (?).

Where does the part go? In the crankshaft? Because that is hard to get at (?)..

 

I doubt the plugs are the problem.

I will have to do some searching tomorrow to find out exactly which one it is.
It might be the sensor in the top of the belhousing or the one in the transmission itself.

 

Alright thanks tech. The Crankshaft position sensor/RPM sensor are the same thing correct? So there is only one location....???

 

Well it could be either the Cam sensor or the Crank sensor or the transmisison sensor.
Take your pick LOL

 

^So the 3-1-1 (RPM malfunction code) refers to 3 possible things?!?!??!

 

I will have to try to remember to check tomorrow at work.
The book I have at home is only a cheater book.

 

http://volvospeed.com/vs_forum/index...howtopic=47502

This is where I found my code. Look under A1.

 

Sorry forgot to look very busy One guy short.

 

^LoL. Not a huge problem. Most likely gonna try to get this fixed over the long weekend.

Imma also take the car in to get all the hoses and what not checked (20$). Someone else told me that my turbo boosting early may be attributed to a leaking hose...

 

Bump?

 

Sorry keep forgetting.
Nothing found on your end?
Wrote it on paper have to tape to my steering wheel for MON.

 

Ok, from what I understand, the RPM sensor/Crankshaft position sensor is located below the airbox and it's relatively easy to replace?

So do I just remove the airbox, unscrew the nut/bolt (whatever is holding it) and then replace it? Sounds like a quick job?