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Odd misfiring on occasion


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7 replies to this topic

#1 Speedwagon

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Posted 17 September 2017 - 07:36 PM

98 Legacy GT, with a 95 EJ22 swapped in.

 

Every so often, the engine will just start to misfire and run very rough with no power. If I shut the engine off, then turn it back on, everything is fine again. It started over a year ago, but almost never did it. In the past 2 months, it's done it more often. It does not flash the CEL when this is happening.

 

And since I can't figure the source of this misfire, here 2 other things the engine is doing:

 

When going down a hill, and engine braking, then getting on the throttle, it smokes for a bit burning off some oil. I suspect valve stem seals for this.

It is also using a bit of oil, which could be tied to the valve stem seals.


Edited by Speedwagon, 17 September 2017 - 07:38 PM.


#2 wtdash

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Posted 18 September 2017 - 01:59 PM

Hi,

I'd still check for codes...cel or not.

Check your Grounds?

ECU/ECM going bad?

PCV valve - related to oil issue?



#3 Speedwagon

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Posted 22 September 2017 - 03:00 PM

Bought a Subaru pcv valve today, going to put that in later. Read the codes, had more than I thought. The EJ22 doesn't have an egr, so the light is always on. Read and reset them.

301(cyl 1 misfire), 302(cyl 2 misfire), 325(knock sensor), 403(egr), 420(low catalyst efficiency), 1507(idle air control).

1507 seems like the only one that could be a cause and not a symptom.

Edited by Speedwagon, 22 September 2017 - 03:06 PM.


#4 Mike104

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Posted 22 September 2017 - 03:19 PM

Clear the codes and see which ones come back first.  The misfires and knock sensor codes could be causing your issues.  Manual or Auto?  I had the P1507 and it was related to the Neutral switch (MT).



#5 Speedwagon

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Posted 22 September 2017 - 06:31 PM

Manual



#6 Fairtax4me

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Posted 23 September 2017 - 01:04 PM

Inspect the knock sensor. Replace it if it's cracked.
How old are the spark plugs? Copper plugs usually wear out in about 30k miles.

#7 Speedwagon

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Posted 23 September 2017 - 06:47 PM

Plugs are probably due. I think I did them at 275k. It's a bit over 300 now.

#8 golucky66

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Posted 23 September 2017 - 07:31 PM

Imo. If you ever get a knock sensor code. Inspect the harness. And then replace the sensor and harness if the harness is damaged.
Honestly. They go bad after a while. 95% if people have sucess with cheap 10$ ones.

But you NEED that code to go away. That will cause the ecm to add more fuel and retard timing.

Edited by golucky66, 23 September 2017 - 07:32 PM.





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