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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

well..... 700 1990

posted by  Rhys on  Tue Nov 29 18:13 CST 2011
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

I don't know the B280F that well, but your description of such huge rpm surging makes me think that the computer is not receiving a good rpm signal. On some other makes I've repaired, a bad high resolution pulse can cause such things. Many makes use a lower res pulse at higher rpm. I'm not sure if Bosch does this. I read that you replaced the crank angle sensor - and it should be fine - but if not, for whatever reason, that may be problem. I know that others have found that damaged tone rings on the flywheel will make for misfires, just how the B280 determines crank angle I don't know, but it should be investigated.
On one of the makes I've had experience with, disconnecting the idle air control valve "calmed" the surging, but the engine could still be felt trying to surge as the ignition timing changed. You might try that. On a scan tool (OBD 1) the rpm signal could be seen jumping up and down in excess to what the engine was actually achieving - and that confirmed the diagnosis.
I hope this helps.
Rhys






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.