Volvo AWD 850 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 3/2012 850 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

hearing PRE-IGNITION sound during acceleration 850 1997


I am experiencing this pre-ignition knocking sound during hard and just right acceleration and at the same time a haunting idle.

I've done research to find some suggestions/inputs for this kind of problem and to list some from the inputs of fellow brick owners like Robert A. Froebel and others as well;

* high temperature of fuel/air mixture in the cylinder
* high compression ratio
* high manifold pressure
* high operating temperature
* low octane fuel (does not apply because I use 93 octane)
* bad knock sensor (does it have to have error codes to replace if it is bad?)

From these kind of topic, there are some that suggests to check or replace:

* intake manifold gasket
* valve job
* knock sensors

I would really appreciate your help and expertise on these matter, thanks again.

chrisq 97 855 T5 70K






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New hearing PRE-IGNITION sound during acceleration [850][1997]
posted by  chrisq  on Wed Aug 11 04:39 CST 2004 >


<< < > >>



©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.