Recurring but Intermittent engine problem - Saab 9-5 Bulletin Board - Saabnet.com
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Recurring but Intermittent engine problem
Posted by PerryD [Email] (more from PerryD) on Thu, 10 Dec 2020 20:35:45
'01 aero wagon 5spd 140k miles
Recently developed a recurring but intermittent rough running engine which is getting worse over the past week.
Engine starts instantly and generally runs well & smoothly however, while driving at city and highway speeds(2000rpm) the engine will repeatedly lose power slightly for a split second, regain power then lose power: little blips of power loss. then clear up and run fine for awhile.
During a half hour highway commute the issue will come and go several times.
Occasionally, while at idle, engine will repeatedly surge from 800 to 1000rpm and back & forth for the duration of the stop light. next stop light - no problem!?
OBD2 reader shows green - all good - no codes.
Recent new OEM DI & NGK plugs.
Is this a MAF issue? Air leak? Bypass valve/ O ring???
Any and all suggestions welcome. Thanks very much!
posted by 23.16.86...
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