Not so random misfire - need guidance

[squeasel]

Greetings All!,
I have a 2003 X5 3.0. The car misfires in a particular situation, throws code P1347 (Cylinder 3 misfire with fuel-cutoff), but does not throw the SES light (I confirmed this light does work though).

I can recreate the misfire easily enough ... with throttle off (moving or stationary) and RPM around 1,000-ish, a solid push on the throttle causes the misfire to the point where the engine cannot exceed about 1800 RPM for many moments. During the misfire though, if I ease the throttle then go back on the misfire clears.

Same situation ... throttle off RPM about 1000 and a soft push on the throttle causes no issue.

Any thoughts?

Thanks in advance.

[upallnight]

Hopefully it's not this

E46Fanatics - View Single Post - P1347-Cylinder 3 Misfire with fuel cut off Help!

[squeasel]

I hope not as well. Symptoms are different and the car is not being driven at -25F.

I have cleared the code and will see what returns. The answer will determine my next move unless someone provides more direct guidance.

[g300d]

With no other leads but that I would probably start with the usual inspection and swapping around of plug/coil/injector between bad cyl and a good cyl.

Hopefully it's not what up posted.

[squeasel]

I will attempt to regenerate the code. If successful I will swap the 3 coil with the 2 coil and the 3 plug with the 4 plug to see if the code changes. I will have to look up how to do an injector swap if it comes to that. And I will post results as they are available.

[upallnight]

I would do a compression check just to verified whether you have the same problem as that guy on the E46 forum.

[squeasel]

@upallnight ... will do. I have never done a compression check on a cylinder that used coil-packs. I am not sure I can get my tester hose in there (note: this is more thinking out loud than anything else).

[squeasel]

Tuesday update (and a case-closed for now) -
Sunday I had no problem replicating the misfire issue
Monday I couldn't generate the misfire
Tuesday I examined the coil packs and spark plugs. The spark plugs were pathetic and were replaced (Note - if someone wants original spark plugs from the build in 2002 they can email me, pay postage and I will be happy to donate ... LOL ... so long as it is before garbage pickup on Thursday morning). I believe the plugs likely had about 170K miles on them. Yes, I am the original owner and offer no excuses.

Until a misfire issue re-erupts (can that happen?) I am putting this one to bed.

[g300d]

Well you sure got your money's worth on those plugs lol!

[Joshdub]

170k on original plugs? That has to be a record or something.