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Thread: Code P0302 Misfire - new plugs Reply to Thread
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  Topic Review (Newest First)
06-05-2018 11:23 PM
goro So here's interesting update. As soon as it got warm 65+ F CEL did not light up. When I connected to OBD, it still showed the code. However after resetting the code, it does not come back. What can we conclude from this?
01-17-2018 03:29 PM
goro Good news - passed inspection today. After I reset the code, OBD was in ready state pretty quickly except EVAP. I read inspection station allowed one to be off for 2001 and later vehicles. So I drove today praying that CEL would not light up during the inspection, and it did not. Was done in 5 minutes with new sticker.
Let's see now if CEL comes back.
01-15-2018 11:21 PM
goro
Quote:
Originally Posted by eagleeye View Post
I only vaguley know what goes on in jersey from speaking to people that live there.


do you have to make a appointment with the state / county NJ inspectors there?

if not maybe you could find a time when you have no light/ no stored code, and enough good data in the system and your hand held says you are ready to test,

...just before the problems come back. if such a time exists I would drive it right down there and wait. (inside the building, not sitting outside idling).
No appointment necessary. This is what I will have to do in hopes that CEL does not come back at the inspection station.
01-15-2018 09:12 PM
joe_pinehill I've had a missfire caused by a bad intake manifold gasket , (not on a subaru, but on a Volvo and a Mazda). Try spraying brake cleaner around the manifold when the car is running and see if the car changes idle.
01-15-2018 05:50 PM
eagleeye
Quote:
Originally Posted by goro View Post
I am afraid it's been 400-500 miles, even more than that. CEL sometimes goes away for couple days, but always comes back. I did reset the code few times but CEL would always come back after few days. Will try again though.
I only vaguley know what goes on in jersey from speaking to people that live there.


do you have to make a appointment with the state / county NJ inspectors there?

if not maybe you could find a time when you have no light/ no stored code, and enough good data in the system and your hand held says you are ready to test,

...just before the problems come back. if such a time exists I would drive it right down there and wait. (inside the building, not sitting outside idling).
01-15-2018 04:50 PM
goro
Quote:
Originally Posted by traildogck View Post
I am going to ask ...

When the new plugs were put in, did you check the gap? I know, I know ... plugs today are gapped for you ... right? You are not supposed to mess with them. Damage to irriduim tips and a Blah ... Blah ...Blah. You know how many incorrect plugs I have found right out of the box ... more than you think. I don't trust any of them. I carefully check every gap before I seal it up in the combustion chamber.

Ask any good gas-fitter if they would ever trust anyone else to ensure the gas is off.

Nope!
Yes I did check the gap, it was properly set
01-15-2018 04:49 PM
goro
Quote:
Originally Posted by eagleeye View Post
misfire not flashing = old and not active.

should cancel itself sometime and when it does go get your test.

(some take 400-500 miles to reset themselves. ) if you go 550 miles clear it out, and then watch you "readiness settings" and all those will light up ready and its your time to go
I am afraid it's been 400-500 miles, even more than that. CEL sometimes goes away for couple days, but always comes back. I did reset the code few times but CEL would always come back after few days. Will try again though.
01-15-2018 04:43 PM
eagleeye
Quote:
Originally Posted by goro View Post
It is not flashing, it is solid CEL. The app that I use says the code is Stored. Per my understanding the app means the code is active.

misfire not flashing = old and not active.

should cancel itself sometime and when it does go get your test.

(some take 400-500 miles to reset themselves. ) if you go 550 miles clear it out, and then watch you "readiness settings" and all those will light up ready and its your time to go
01-15-2018 04:31 PM
goro
Quote:
Originally Posted by eagleeye View Post
is it a active misfire with a flashing check engine light?

or a stored one.
It is not flashing, it is solid CEL. The app that I use says the code is Stored. Per my understanding the app means the code is active.
01-15-2018 04:25 PM
traildogck I am going to ask ...

When the new plugs were put in, did you check the gap? I know, I know ... plugs today are gapped for you ... right? You are not supposed to mess with them. Damage to irriduim tips and a Blah ... Blah ...Blah. You know how many incorrect plugs I have found right out of the box ... more than you think. I don't trust any of them. I carefully check every gap before I seal it up in the combustion chamber.

Ask any good gas-fitter if they would ever trust anyone else to ensure the gas is off.

Nope!
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