Bad Coil Packs ? - Help
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my car CES light is blinking and Im getting - po300 code (random misfire)
I replaced all the spark plugs and check the coil packs but didnt see any blistering on any of them.. Does anyone know how to test for a bad coil pack?
thanks for any help -
I replaced all the spark plugs and check the coil packs but didnt see any blistering on any of them.. Does anyone know how to test for a bad coil pack?
thanks for any help -
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When I had a bad coil pack I got specific cylinder misfire codes (ie po3001 - cylinder 1 misfire). If you have multiple bad coils you may get a random cylinder misfire, but thats hard to tell.
What all is done to the car? What EM are you using?
What all is done to the car? What EM are you using?
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i have a vortech on it with the split sec..
Coil packs are 80 dollars at autozone..
Im going to take it in tomorrow and have it scoped..for 90 dollars..
Coil packs are 80 dollars at autozone..
Im going to take it in tomorrow and have it scoped..for 90 dollars..
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Originally Posted by KPierson
When I had a bad coil pack I got specific cylinder misfire codes (ie po3001 - cylinder 1 misfire). If you have multiple bad coils you may get a random cylinder misfire, but thats hard to tell.
KPierson: Did your motor feel different when you had the misfire in cylinder 1?
(I have a 2003 350Z with a Greddy TT kit on... running UTEC.)
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I've been a little distracted and haven't spent much time troubleshooting this. (I bought a motorbike.) The car has been on the road for ~9 months with this issue (misfire in cyl#6).
Hopefully, I'll have some time to troubleshoot over the next couple months. I figure it's either the coil, wire, or sparkplug. If anyone else has any ideas, please post!!!
Hopefully, I'll have some time to troubleshoot over the next couple months. I figure it's either the coil, wire, or sparkplug. If anyone else has any ideas, please post!!!
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Guys before you go spend X amount of cash on a expensive coil pack.Swap out that coil pack with another cylinder.If the problom go's to that cylinder you know thats the problom.If it stays the same probable spark plug or more seroius!
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is there a possibility that the engine suffers misfire without showing CES light if the misfire timing is within a tolerance (I don't even know if there is a such thing as tolerance, but my car has a "small random hiccups" during idling).
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Originally Posted by davidz33
is there a possibility that the engine suffers misfire without showing CES light if the misfire timing is within a tolerance (I don't even know if there is a such thing as tolerance, but my car has a "small random hiccups" during idling).
yes. every engine misfires pretty much all the time. since the o2 sensors are only looking at data from 4 cylinders ( i4 or v8) 6 (i6 or v12) or 3 (v6) the a/f ration changes constantly. you can see this as the o2 sensors bouncing back and forth from rich to lean. since the a/f is read and altered by bank, not by individual cylinders (think top fuel) they are always just a bit off. if i plug in a scanner at work and let a car idle it will throw a misfire every once in awhile. this is normal. the pcm has a logic program or algorithym to detect a cylinder that is missing more than it should.
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Not on our engines apparently. I just replaced 2 in the last month. I was told by both shops that I got them from that they sell a ton of coil packs to G35 and 350z owners. One shop suggested that it was due to moisture getting in and causing the spark plug to arc?
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checking your coil packs would probably be easier. if there's no cel light i dont think its that much of an issue. an 02 sensor might cost more. or maybe you just need a good tuneup.
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I saw this post after looking for problems similar to my 350z. My CEL is on and have had it scanned 3 times getting the code PO350 primary and secondary coil failure but the car is running smooth and goes like a beast, no abnormal miss fires or loss of power. I also did a manual reset 3 times and the CEL light seems to come on randomly when it likes. The last time it took a week before it came on otherwise sometimes it will come on after a few starts. Been doing some research and apparently coil packs generally dont go bad and shouldnt be changed untill it pretty much dies and the car stops going? Apparently it can be a problem with the main module, sensors or a short somewhere..Dont know if this information helps anyone here but thats what ive gathered up till now
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I had this happen back in August. Replaced the pack and it happened again to the same pack a month later. This was less than 500 miles. I drive my car less than 3,000 miles per year. This past weekend I fired her up and the symptoms were back. Granted the last two were replaced under warranty, but it was less than 1400 miles and two brand new packs went bad. They were all on cylinder 1.
After the garage fixed it a second code was thrown and I had a bad coil pack on cylinder 3. Seems like a shitty reoccuring problem. In fact I have been considering trading in my Z just because of it. It has cost be over $300 and is annoying.
car info: 03 Enthusiast Manual with 61K.
I hear now this is common in the Z, G, Maxima, Audi, and Volks
After the garage fixed it a second code was thrown and I had a bad coil pack on cylinder 3. Seems like a shitty reoccuring problem. In fact I have been considering trading in my Z just because of it. It has cost be over $300 and is annoying.
car info: 03 Enthusiast Manual with 61K.
I hear now this is common in the Z, G, Maxima, Audi, and Volks