May 30, 20187 yr I have a 2001 Legacy that idles rough when started, and then the idle will smooth out when full temp is reached, but when you drive it it still hesitates a bit on aceleration. The OBD says I have a misfire on 3 cylinders. Should I just change the ignition coil? Can I test the coil first to see if it bad? Thanks for your help it is always much appreciated.
May 30, 20187 yr Get a used Subaru coil from an Auto wrecker but change the spark plugs and wires (NGK only) first. Don't drive it or you will toast your Catalytic Converter (misfires put unburned fuel into the cat destroying the catalyst)
May 30, 20187 yr OP should post milage, but I assume it's 150k+. Of course the spark plugs and wires are always a concern. Also check for oil on the wires which would mean they are toast. However, I have a 2002 and I had similar hesitation especially from a stop. I fixed it by changing the A/F sensor [front O2 sensor]. So I would look there first. I used Bosch sensor from Advanced Auto forr $65. Easy change.
May 30, 20187 yr Author Thanks a bunch. Sorry I forgot to post the miles, it is low. only 130k, and car was in bit of a small acident, front end.
May 30, 20187 yr 1. Test coil 2. Clear codes and see which comes back first (wash rinse repeat) 3. Change plugs and wires. NGK or OEM.
May 30, 20187 yr Change timing belt and pulleys soon. It’s gonna fail and bend valves that codswallop is 20 years old and over mileage.
June 4, 20187 yr Could be an EGR issue. If you have tons of build up on the ports, etc. it can cause those symptoms. Scroll down to the "Problems with EGR" near the bottom: http://www.agcoauto.com/content/news/p2_articleid/207 and see if that sounds similar to yours.
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