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Unread 08-21-2010, 04:17 PM   #3

Name: Clarksonvalley
Title: United Newb
Status: Offline
Join Date: Aug 2010
Location: St. Louis, MO
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Your Ride: 1995 540i
1995 540i Compression Test

Compression check as follows:

Left bank, front to rear = 200, 200, 202, 222

Right bank, front to rear = 200, 210, 204, 212

Engine was up to temp when I did the compression check, throttle was wide open, cycled each cylinder thru 12 compression cycles.

I did a leakdown test on the 222 psi cylinder - with 98 psi reference pressure, leakdown pressure was 97.5 psi.

I think it is an electrical problem - the plug is not firing. Any suggestions on how to check this out?

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