04 wrx All cylinder missfire help!

[unpimpthis]

that's true, but seeing as it has been happening since he got the car, it could have jumped a tooth and just auctioned without being fixed? not arguing, just saying

[VD5505]

well first i would clean the MAF and check ALL your vaccume hoses even if one is loose it can make your car run all wacked, if you have anything different than OEM plugs put oem plugs back in it, after you have cleaned the MAF reset the ECU and then go start the car and drive it, if it still runs weird and has missfires try to unplug your MAF and go drive it this will over ride any leaks you have and if it drives fine you have a vaccume leak, quote me if im wrong anyone but i think thats right.

[orion3]

Thanks for the help guys i really appreciate it.

I purchased some MAF cleaner and cleaned the MAF sensor, it was prety dirty but after resetting the ECU the car performed the same.

After examining the harnesses over near the pasenger side strut i noticed there are clear modifications to one of the wires.

There are grey wires spliced in to factory wires. These grey wires go down directly below below to another harness with a blue plug, i have a pic of it.

The rest of the plugs on the harness are all being used so i guess the plug was removed and replaced with these grey wires.

What purpose do you think these wires serve? could it be my problem?
Ill try driving it with the MAF disconnected tommorrow.

[nagyhead]

that looks like the wire harness for you BCS. Man that thing is hacked the F up. I would take it to someone who knows Subaru's. Your misfire issue is clearly something in the wiring.

[VD5505]

Originally Posted by nagyhead

that looks like the wire harness for you BCS. Man that thing is hacked the F up. I would take it to someone who knows Subaru's. Your misfire issue is clearly something in the wiring.

+1 to that man

[nagyhead]

i don't even see a BCS in that mess. how is your boost being controlled?

[dumdum]

Don't drive with the MAF disconnected.Looks like someone(old owner) installed a GM 3-port BCS on your car.The missfire are not because of the wiring.That car is not stock.It probably was "returned to almost stock".The one free harness is the EGT plug.The EGT probe/sensor has probably been deleted.Is the car an auto or manual transmission?Pull the spark plugs and make sure they are the correct ones.Also check the gaps.Then do a compression check.See if you can find what the grey wires go to and take a GOOD picture.I'm guessing it is a GM 3-port with the optional pigtail.Should be a sensor looking thing with 2- 3 vacuum lines coming off it.

[Longshot]

Originally Posted by dumdum

I'm guessing it is a GM 3-port with the optional pigtail.

Thats exactly what it looks like to me. The optional harness for sure (pics 1 and 2).

[orion3]

Thanks for helping.

The 2 grey wires continue down below that big harness down to what i am guessing is the BCS. It looks Stock to me but im not sure. There is a red perrin turbo inlet installed on the car. If the BCS is stock could have possible just been moved in order to account for the aftermarket perrin turbo inlet?

Its the blue plug in this picture.

[dumdum]

That is not a good picture.Pull the solenoid up and take a picture of it.You should have enough slack between the pigtail and vacuum lines.So far it does look like a GM BCS.Is the car a manual or automatic?That BCS is the least of your problems right now especially since you don't even have a boost gauge.Like said earlier,pull the plugs (one at a time) and check the part #'s and gaps.It's even possible that the coil packs got put on wrong (crossed the harness).At this point you probably have multiple problems....