Question about Subaru Forester
Hello first of all
I would be glad to give you the best advice as a mechanic for 8 years 3 for bmw and 5 with ford motor company.
That being said your diagnosis is good and you followed the correct troubleshooting guide lines so good job with that. I am not super familiar with subaru but if you have one coil for all cylinders this is most likely not your problem but a good way to check your coil is take the spark plug out of head , then reconnect to spark plug wire lay spark plug near a metal surface and have someone try to start the car look at the color of spark if its blue spark your coil is not the issue if orange spark coil is faulty not firing a hot enough spark to fully ignite gas vapor. '
So with all that some newer cars do have coils with a coil pick up built in this may be faulty to if applicable to your car if so the only way to know is for you to change the coil.
However if the coil does not fix your issue i would strongly lean on a crankshaft position sensor and or a camshaft position sensor as they tell the ecu when to fire spark and in what order to fire it and are more commonly known to be faulty before all else.
The crankshaft position sensor is located either under the harmonic balancer pulley or facing the pully were the belt is not if under pulley you will need to rent from autozone a harmonic balancer pully puller its free just pay and get money back when you return.
camshaft position sensor is normally located were the distributor was located easy to locate if diffident though.
If your coil does not resolve the issue one of these two will.
Please if it helps 4 thumbs and testomnial would be greatful for thanks any ? just ask
Posted on May 26, 2011
Hi Jared, it sounds like your on the right track. This flashing Engine light is normal when you have a missfire thats constant and is bad enough to damage the cataylst. I think the coil is the culprit, based on the time it takes to start misfiring it could be that the computer is aware of a problem in the coil and is shutting down number 3 injector to keep from washing down the rings. I would replace that coil pack and retest. I would mention to keep in mind also that carbon build up on the back of the valves can cause this also, however it is usually more noticable when cold and on intial startup. If the coil dosen't fix it, try some top engine cleaner like seafoam.
Posted on May 25, 2011
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Posted on Jan 02, 2017
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