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Compression test comments 900 1991

posted by  jotvolvo on  Wed Feb 27 05:42 CST 2008
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last visit: Mon Oct 12 08:43 CST 2009
[RELATED]

Hi all,
1991 940SE Turbo - I am strugling to find what is causing my erratic idle. Car idle badly regrdless of engine temperature. Checked all vacuum lines, could not find any leak. Yesterday checked the compression with screw type gauge. Engine at normal operating temperature. Removed all plugs. Disconnected all injectors. Disconnected positive lead (15) from ignition coil. Disabled main fuel pump. At wide open throttle (WOT) I got the following readings:
Sparkplug # from front of the car to rear 1, 2, 3,4 compression reading 175, 160, 165, 165. Please comment if these numbers shed any light on any issue. If not, should I be contended that engine is perfect and I should be looking at air/fuel/ignition parts to the cause of erratic idle.
Thanks as always.
Ram






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