The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

more likely loose bolts on compressor bypass valve. 700

posted by  someone claiming to be JohnB on  Sat Jul 19 00:35 CST 2003 [RELATED]

that's the thingy near the radiator inlet from the engine. Two hex head cap screws hold the valve to a bracket...gasket underneath the valve. There is a vacuum line from the manifold to the valve. When the engine goes from pressure to vacuum the valve opens and bleeds compressor pressure around the turbo. When the valve leaks, the turbo spins up to try to replace the leak, sucking more air through the amm than gets to the engine, but the ecu reads the amm signal as a demand for beaucoup fuel and increases pulsewidth accordingly, ergo too much fuel and black smoke.

I had to replace my cap screws with hardened socket head cap screws, use lock washers, red loctite, and a new gasket. Has now held for some five years plus.






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.