Can't figure out misfire.

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Old Jun 9, 2017 | 11:33 AM
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Can't figure out misfire.

Ok, so I started getting misfire codes. Random. Cyclinder 1, cylinder 6 just all over the place. So I changed all 6 plugs and all six coils. Was good for a bit. 400km. Now it's misfire again random and all six cylinders. Now when it happens. The car is definitely shaking and lacking power. I can pull over reset the engine light. Not even popping the hood and the car will be ok for 20 30 km again. I'm thinking maybe ecu but people on here much more educated then me. Any help would be grate let appreciated
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Old Jun 9, 2017 | 11:33 AM
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automatic or manual transmission?
have you checked the EGR valve?
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Old Jun 9, 2017 | 11:39 AM
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Automatic transmission and yes I have had the egr cleaned out right after I replaced the coils and plugs
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Old Jun 9, 2017 | 11:41 AM
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can you check the ECU to see if there is any evidence of water?
a/c drain tube can get clogged which then sends excess water inside...and drips all over ECU.

the ECU is located in the front passenger foot well. it'll be on the left underneath the carpet towards the center stack
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Old Jun 9, 2017 | 11:47 AM
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Have not checked that I will for sure tonight though. Also one day randomally had a code I believe it was p1298. Electric load detector "high output". Cleared it and have never seen it again. Couple weeks or so now
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Old Jun 9, 2017 | 11:52 AM
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yeah, i would check the ECU to make sure there isnt any evidence of water.
but that code P1298 doesnt sound promising! "electrical load - high output!!" doesnt sound too good
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Old Jun 9, 2017 | 11:54 AM
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Lol couldn't agree more thanks for the ideas man
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Old Jun 9, 2017 | 11:58 AM
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and probably what pushed you to make that user name...
hope your luck turns around!!
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Old Jun 9, 2017 | 08:17 PM
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From: KCMO Burbs
With that code, may be a good time to check your battery and alternator as well. Unstable voltages cause all kinds of odd things on these cars.
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Old Jun 10, 2017 | 06:48 AM
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Multiple cylinder misfire is a problem that applies to all cylinders, e.g. fuel mixture, not usually plugs/coils.
EGR system a good place to start, but check for a vacuum leak, also check air intake duct work as some crack over time and then there's always fuel pressure.
Post about checking the ECU can't be overlooked.
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Old Jun 10, 2017 | 07:30 AM
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Alternator and battery are both less then 6 months old but I will run a test just to be over sure. Thanks


Originally Posted by Jackass
With that code, may be a good time to check your battery and alternator as well. Unstable voltages cause all kinds of odd things on these cars.
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Old Jun 10, 2017 | 07:32 AM
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So so I did just find a crack in the air duct work between the air filter and throttle body, I'm going to try to see if I can get a new duct piece. Thanks for the advice and still yet to check the ecu for water damage

Originally Posted by Turbonut
Multiple cylinder misfire is a problem that applies to all cylinders, e.g. fuel mixture, not usually plugs/coils.
EGR system a good place to start, but check for a vacuum leak, also check air intake duct work as some crack over time and then there's always fuel pressure.
Post about checking the ECU can't be overlooked.
Reply
Old Jun 10, 2017 | 09:34 AM
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Meh, don't think the cracked duct is your issue, but you should still get it fixed.
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Old Jun 10, 2017 | 05:37 PM
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Maybe inspect all electrical pieces, lines, and connectors at the coils and between there and the ecu. Sounds electrical in nature. Lots of the obvious stuff has been mentioned but all are good ideas and worth double checking at this point.
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Old Jun 13, 2017 | 10:52 AM
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If I were to swap out the ecu for a new used one. Is it just plug and play? Or so I have to go get a flash or something fancy?

Originally Posted by GreenSpades
Maybe inspect all electrical pieces, lines, and connectors at the coils and between there and the ecu. Sounds electrical in nature. Lots of the obvious stuff has been mentioned but all are good ideas and worth double checking at this point.
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Old Jun 13, 2017 | 12:45 PM
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Is there a way I can check the egr system? I have had it cleaned but wouldn't mind checking for piece of mind



Originally Posted by Turbonut
Multiple cylinder misfire is a problem that applies to all cylinders, e.g. fuel mixture, not usually plugs/coils.
EGR system a good place to start, but check for a vacuum leak, also check air intake duct work as some crack over time and then there's always fuel pressure.
Post about checking the ECU can't be overlooked.
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