Half Boost then outa Nowhere... - Saab 9-3SS Bulletin Board - Saabnet.com
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04 Aero, 81k. So I hada pretty serious engine shudder under moderate to high boost. Changed plugs and it seemed to help but shudder came back shortly thereafter. OBD registered no misfires. I then changed out two coils, the old ones with the grey epoxy (I assume they are original) for 2 new ones with the black epoxy. It cured the shuddering immediately but now my OBD II registers multiple misfires and the car routinely will not go beyond half boost...and then from whatever reason 5 or ten minutes later full boost is back. Don't get it. One of the coils is still the original grey one and other 3 are the black. Could that do it? Don't have a Tech II.
Philip
87 900 T
04 9-3 Aero
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