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2.1 B212-intake manifold showing positive pressure !!!
Posted by BJDinNC [Email] (more from BJDinNC) on Tue, 3 Jun 2003 18:37:24
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'91 900 2.1 non-turbo; idle manifold vacuum is 18 Hg. If I snap the throttle wide open, it drops completely to zero and studders sharply wanting to stall ... sometimes shows a bit of POSITIVE intake pressure. When I snap it closed... it recovers immediately. It is not a plugged cat converter. I am thinking that the intake cam gear is off a tooth on the timing chain... or some other timing chain problem. Another possibility is some sort of ignition problem with spark is detonating a cylinder that has an intake valve open or partially open... and I am getting a bit of a backfire pressure when the throttle is snapped open ... etc...
Any other ideas or comments appreciated ... ???
posted by 65.80.200...
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