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hearing PRE-IGNITION sound during acceleration 850 1997

posted by  chrisq on  Wed Aug 11 04:39 CST 2004
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last visit: Fri Jun 7 07:44 CST 2002
[RELATED]


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





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