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Old 03-07-2013, 01:18 PM   #8
Scooby Specialist
Member#: 166898
Join Date: Dec 2007
Chapter/Region: W. Canada
Location: Canada
1994 T leg SS


Did you check your compression with throttle wide open and at operating temperature? With all plugs out and fuel discharged? Lack of compression in CYL 3 could suggest a connecting rod bearing letting loose creating lower compression numbers compared to other cylinders.

~Now that you verified compression is within spec keep in mind the elevation you are at, do a leak-down test and see what happens.

I did have an EJ25D make a similar noise however it was more consistent through the rev range ~Turned out someone timed it a few teeth out.

Just start basic and do all the standard diagnosing procedures.


-Leak-down on all cylinders

Just my two cents

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