Odb-ii p0302

[dreamrider01]

Alright, earlier post on P1478. Went ahead and cleaned gas cap. Although, I thought the cause was elsewhere. Reset ODB-II, nd drove off 10 miles parked, cooled, driving back. No cods so far, no misfirings. Pushed it a “little” on the way back, and 1 mile from home horrendous misfiring starts. ODB-II still reading 4 tests incomplete from the reset earlier, and 1 code P0302. So horrendous misfiring on cylinder 2.

Gonna swap COP with another cyl, and see if it is the COP/wiring to COP.

Question: I supose cylinder number is front-to-back, rather than otherwise?

[dreamrider01]

P0302 Becam e P0303 upon COP swap. Gotta order COP. Any recco’s for quality-price COP source?

[dreamrider01]

New OEM Bremi 11860, ebay.com $21.84 including shipping.

[328 Power 04]

If you cheap out here and get stuck paying for chinese replicas, you will be changing them again.

[dreamrider01]

F70A344A-C298-4EE1-A3C0-90543F84D8B8.jpg

Thanx, Abel. Well, it said 1748017 Bremi 11860, brand and part number, rather than a Chinese off-brand. Sames as OEM I have on now (see pic). So, I am not sure it is a fake-branded impostor, or the real thing.

https://www.ebay.com/itm/BMW-Z-M5-E3...a105%7Ciid%3A1

- - - Updated - - -

Also, I think the COP may not have anything to do with the P1478 I got earlier. So, this part is the easy fix. Then, wait for P1478 to show up again.

[328 Power 04]

If those are actual pictures, they do look genuine. I'm impressed with the price. Try it out.

I'm just skeptical when it gets this cheap, because I have seen even "BMW Original" INA lifters, that were 100% counterfeit and very poor in construction.

[dreamrider01]

If those are actual pictures, they do look genuine. I'm impressed with the price. Try it out.

I'm just skeptical when it gets this cheap, because I have seen even "BMW Original" INA lifters, that were 100% counterfeit and very poor in construction.

I know. Well, they looked legit. I am all about OEM for most things. The guy only has 4 to sell. So, thinking that this dude had a 4-cyl Z3, got rid of it, and had these laying around. They are about 1/2 price of any parts site, even after his whopping $9.95 shipping cost.

As always, will see...

[djb2]

It's usually the connector boot (the spark plug boot, not low voltage connector) that degrades, not the coil itself. Two Bremi brand ones for $10-$12 on eBay -- about the same price as generic ones.

The failure is by carbon tracking. An occasional stray spark separates atmospheric CO2 into carbon and ozone. Initially the carbon only slowly builds up. Once the conductivity is high enough, it rapidly builds thickness.

[dreamrider01]

Connector boot looked fine, and ODB-II went from P0302 to P0303 when I swapped connectors between cyl’s 2 and 3. The later I would consider tangible evidence of COP failure. 87K Miles on these OEM, manufactured on 4/22/2000, by the date stamp on them.

Wondering what goes bad in these. Everything usully looks fine on the outside with these failing COP’s. Proly a $0.25 capacitor inside.