catsdaddio123 Posted May 30, 2014 Share Posted May 30, 2014 Driving home last night, 1999 Subaru Legacy Outback 2.5 was running fine when all of a sudden it turned rough and Check engine light started flashing. Previous to this, there had been some very intermittent missing, which my mechanic attributed to bad gas/clogged injectors. I ran some Sea Foam through and everything seemed ok.Apparently there is a cylinder not firing. Any ideas on where to start? Quote Link to comment Share on other sites More sharing options...
MilesFox Posted May 30, 2014 Share Posted May 30, 2014 spark plug wires. NGK brand only. Do a dark test and run the engien in total drknesss and look for arcing Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted May 30, 2014 Share Posted May 30, 2014 Spark plugs and wires. Use NGK brand parts as Milesfox said. Quote Link to comment Share on other sites More sharing options...
jp98 Posted May 30, 2014 Share Posted May 30, 2014 Odds are that if it was flashing it stored a code. Get it read and then go from there, a tune up never hurts. Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted May 30, 2014 Share Posted May 30, 2014 new plugs and wires are almost always a good idea, especially if you have not replaced them in several years. but if it started running ruff, all of a sudden maybe the timing belt slipped a few teeth. how old is the timing belt? how many miles? how long have you had the car, miles? any recent work? 1 Quote Link to comment Share on other sites More sharing options...
lmdew Posted May 30, 2014 Share Posted May 30, 2014 Get the CEL Codes first. Then apply the suggestions above as indicated by the code. Quote Link to comment Share on other sites More sharing options...
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