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04-29-2020, 04:16 PM | #1 |
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Help Troubleshooting Misfire
A few days ago I took the Z out for a mental health drive. Shortly after leaving my house the ride got rough, power was low and it threw an SES. I limped it home 1/8th a mile, turned it off then back on and the SES and rough idle were gone.
Fast forward a few days and I fired her up and gingerly drove around the block and then gradually extended my range to include highway driving and a total of about 45 minutes of trouble-free pleasure. As I was pulling in my driveway the SES and rough idle returned, so I parked it, shut it down then turned it back on and everything was okay. The code reader tells me P0301 Cylinder 1 misfire. The google machine tells me it could be many things, but most likely the ignition coil. I pulled the coil and plug today (images attached, sorry for the blurry one). The plug has about 3k miles on it. My plan is to replace the cyl 1 coil. Questions: 1. How can I tell if I have a Bosch or Delphi coil? I'd like to make sure they all match. Was OE in 2007 Bosch? I see three different options: Delphi OE: 12138616153 Bosch OE: 0221504470 Bosch OEM: 12138616153 (same pn as Delphi) 2. With 133k miles, should I replace all 6 coils? Cyl 4 coil was replaced 50k miles ago and the rest are original. 3. Any other thoughts on troubleshooting?
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04-30-2020, 11:28 AM | #2 |
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Exchange the coil from #1 with another cylinder. Clear the code & then do another test drive. If a new code po301 travels on the cylinder you exchange the coil with. Then you confirmed it as a bad coil.
It's recommended to do all of the coils. However, it's not the end of the world if you only replace the bad one. Unless maker marked I wouldn't be able to determine the actual maker of a coil. |
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04-30-2020, 04:32 PM | #3 |
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Could be the photo but it look like there's a heap of deposits on that spark plug. Are they all like that? You might want to scope the cylinder and have a look at the piston etc.
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04-30-2020, 04:53 PM | #4 | |
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Quote:
Scoping a cylinder is beyond my abilities. Any other thoughts based on the current evidence?
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04-30-2020, 09:33 PM | #5 | |
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Quote:
6 new coils on the way.
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