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Guest Message by DevFuse
 

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2002 Subaru Forester automatic 200k popping sounds from exhaust


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16 replies to this topic

#1 3Pin

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Posted 13 September 2017 - 05:11 PM

I just bought a 2002 forester S with 200k.  Drives ok, but at idle the motor is shaking a little and the exhaust is sputtering.  I ran the codes and they were initially po301, po302, po420 and po442.  Previous owner couldn't pass emissions he says and gave up on her.

 

I cleared and drove it some more and got back a pending po301 and a po302 and that is it.

 

I was thinking of switching the wires from side to side and putting on a spare coil I have to start.  I figure it could be injectors or valves after that.  Anyone else have an opinion?

 

 



#2 lmdew

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Posted 13 September 2017 - 06:07 PM

Sounds like a good plan.

I'd also look at the plugs - copper core NGK and Subaru or NGK wires as you know.

 

Fuel Filter/fuel pressure check.

 

Good Luck,



#3 1 Lucky Texan

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Posted 13 September 2017 - 06:37 PM

look for oil on the wire boots

 

1&2 share a coil so, coil pack is a good idea



#4 GeneralDisorder

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Posted 14 September 2017 - 12:50 AM

Cylinders 1 and 2 share the wasted spark coil, so a coil, terminal, wire, or plug problem could affect both cylinders. Usually this means the coil pack is the issue but it could be coincidence. If a spare coil doesn't solve it, then run a compression test across all 4. If 1 and 2 come up low then the problem is internal because they don't share a camshaft so timing is ruled out. In that case most likely would be burnt exhaust valves which will be a re-ring and new valve situation.

GD

#5 3Pin

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Posted 14 September 2017 - 04:44 PM

so I swapped a working coil and 2 known good wires and same behavior.  I am going to pull the plugs on that side next but my gut is telling me it is the exhaust valves.  there was a little bit of oil on the plug wire of #3, but not dripping.


Edited by 3Pin, 14 September 2017 - 04:45 PM.


#6 3Pin

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Posted 14 September 2017 - 08:08 PM

put in new plugs and replaced the knock sensor after getting a code for it.  Still getting misfire in 1 and 3.  I also put in some premium fuel and some fuel injector cleaner as a last ditch.  Seems to run better than it did before, but still is send me a pending code and eventual code for miss on 1 and 3.


Edited by 3Pin, 14 September 2017 - 08:20 PM.


#7 golucky66

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Posted 14 September 2017 - 08:24 PM

Try swapping inspector.

#8 GeneralDisorder

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Posted 14 September 2017 - 08:29 PM

Try swapping inspector.


You mean the ignitor? It's built into the coil pack so he already did.

GD

#9 3Pin

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Posted 14 September 2017 - 08:31 PM

Did you mean to say fuel injectors on 1 and 3?


Edited by 3Pin, 14 September 2017 - 08:35 PM.


#10 golucky66

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Posted 14 September 2017 - 08:59 PM

Fuel injector. Stupid auto correct.

Yeah. I mean if you seriously think you noticed a difference after putting cleaner in...
I don't know. Worth a shot.

Edited by golucky66, 14 September 2017 - 09:00 PM.


#11 GeneralDisorder

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Posted 14 September 2017 - 10:35 PM

It's faster to do a compression test as the next test. But injectors may be indicated if it's got good comp. numbers.

GD

#12 3Pin

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Posted 14 September 2017 - 10:48 PM

I think I will drive it tomorrow for a bit and see.



#13 golucky66

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Posted 14 September 2017 - 10:53 PM

It's faster to do a compression test as the next test. But injectors may be indicated if it's got good comp. numbers.

GD

Provided he has, or has access to a tester. Yeah that would be a lot quicker as the next step. Completely forgot about compression testing in this scenario.

Love being able to turn around, open my toolbox, and have everything i need right there.

Edited by golucky66, 14 September 2017 - 10:54 PM.


#14 GeneralDisorder

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Posted 15 September 2017 - 12:14 AM

Well I usually have to walk over to the diagnostic tool shelf for the compression tester. It's a little farther than turning around to my box. I keep that stuff more centrally located so all the guys know where to find it. Expensive diag tools are community use at my shop. I don't expect the techs to buy that stuff.

GD

#15 golucky66

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Posted 15 September 2017 - 06:07 AM

Oh man. I wish my shop was that nice.

#16 3Pin

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Posted 15 September 2017 - 08:22 AM

I agree.  Compression test next.  To the shop for that.



#17 3Pin

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Posted 17 September 2017 - 12:02 PM

yup, exhaust valves.   Well, engine is coming out to fix the valves and the rear main is leaking and HG are starting to seep.






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