I have a 1994 850 Turbo with BSR ECU and Cat back exhaust. The car over heated a year or so ago, and i replaced the motor and turbo (both Used). After i over heated the car, it went into a limp mode and will only go to 5 psi. I have replaced all my hoses, intercooler, and vaccum. I dont know where to look next. Possibly O2 sensors? the maf sensor, and the sensor where the 3 hoses come in from the turbo is new. I have alot of codes that come up, and i know the car is old, but i just want my boost back..

Any help would be appreciatted.

 

What are the codes?
Have you tried clearing them?

 

check the codes, find out what they are, fix the problems and clear the codes.

 

I cant seem to find the sheet with all the codes, does anyone have it online?
plus how do you reset all your codes?

thanks

 

Go to a local Advanced Auto Parts or something similar. They should be able to check the codes and possibly clear them too.

IPD sells a tool that you can reset your codes.

 

http://www.volvospeed.com/dtc_a2_codes.php
http://www.troublecodes.net/Volvo/

Your vehicle is pre-1996. You should be able to pull the codes and reset without special tools. Locate the diagnostic unit to the right of the windshield washer fluid filler cap.

 

i ran the codes, got a O2 sensor reading. I replaced the Sensor and now my #2 socket on the dianosis reads 1-1-1

does anyone know other reasons why I am only running 5 psi? if i put my ecu in another car that car runs fine...so thats out. IF i pull the hose off the wasteate it boosts right up.
Has anyone ever put a manual boost controller on?

i need to figure this out...A 850 with 5 psi boost = no fun

 

how much is a new/rebuilt turbo?
if so where can i get one? new or rebuilt?


thanks

 

http://www.vivaperformance.com

They sell new turbos.

 

Did you replace the Boost control Valve yet?

 

Yep, find the part that is causing the problem. Don't go around randomly swapping out parts like the turbo.

If you figure out that it is in fact the BCS (Boost Control Solenoid), then go ahead and install an MBC if you'd like. What you don't want to do is have mods with an existing problem.

 

is the boost control solenoid , the one where the 3 hoses come in connected to the air box?
if so then i have replaced that.

im thinking that the wastegate is shut, and wont open...my guess?

 

Yes, the BCS is the one w/ three hoses mounted to the air box.

A tear in the wastegate diaphram can cause this. Does it go past 5 then drop down to 5psi?

Check for codes again. You don't always get a check engine light with a fresh code.