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Old 08-25-2015, 01:33 PM   #1
Scooby Newbie
Member#: 428834
Join Date: Aug 2015
Default Stock 2003 Forester X misfires on all cylinders

Hey all, I'm coming to you after tearing my hair out over this misfire issue.
2003 Subaru Forester X, 2.5 N/A motor.

I've gone through and read the other misfire threads and have tried their suggestions, but it seems like nothing has solved this issue.

The car runs and drives fine, as though nothing is wrong at all, but at high speed (60+MPH) the check engine light flashes and throws the code for a misfire. It doesn't feel like a misfire, but if you back off the throttle the light stops flashing and goes away completely.

I check the codes and it tells me that I have a misfire on all 4 cylinders. Great... I change the coil, that doesn't solve it. I change the plugs, wires, air filter, fuel filter, and both the cam and crank position sensor. Everything seemed good, girlfriend says the car feels more peppy, but the god damned CEL will still flash. Now I'm at a loss.

The CEL flashed yesterday and when I was able to check the codes this morning, nothing was logged. Update: Codes were thrown after driving it again for a short period of time, misfire on all 4 cylinders again.

The only other things I can think of is the 02 sensor has failed, but I don't have a code for that (despite one being set this winter and disappearing) or that the timing belt skipped a tooth on the cam and its slightly off. I'm shying away from this because:

1. the PO replaced the timing belt, and
2. I don't want to go through the hassle of pulling the front half of this car apart to check the timing.

Is there anything else I should be considering with this issue? If I have to check the timing I guess I will, but I'd like it to be a last resort.
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Last edited by rllamarca; 08-25-2015 at 01:59 PM.
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