Odd one today

[73CSL]

Had an odd one today ....accelerating hard to overtake, I Accidentally hit the Rev limiter in 3rd , changed into 4 th and the engine warning light came on and car was misfiring ( felt like the limiter) . Coasted along on a light throttle at 70 for about a mile misfiring all the way ( was on the motorway so couldn't immediately pull over) and up the slip road. Slowed to a near stop, changing down through the gears ..... Then light went out and misfire gone .

Car then fine for the rest of my 15 mile journey incl some full throttle pulls all the way through the Rev range.

any ideas ? Rev limiter stuck on ( is that possible ) , coil pack threw a wobbly ?

[Neil M]

Sounds like one or more of the coils is on its way out. Have they ever been changed. :whistle:

[73CSL]

not sure if the coil packs have been changed .. car clicked over 67K miles yesterday ( I bought it at 59K ).

Trying to understand why the rev limiter reining back the ignition would cause a coil pack to temp fail ?

Will a diagnostic show what happened and to which coil pack ?


£21 for a coil pack good ?

http://www.eurocarparts.com/ecp/c/BMW_M3+Coupe%5ECabriolet_3.2_2003/p/car-parts/engine-parts/ignition1/ignition-coil/?413110187&1&ab2664a4e9c1506129f3f7baa9537761d6cfef9b&000197

[giraffe]

not sure if the coil packs have been changed .. car clicked over 67K miles yesterday ( I bought it at 59K ).

Trying to understand why the rev limiter reining back the ignition would cause a coil pack to temp fail ?

Will a diagnostic show what happened and to which coil pack ?


£21 for a coil pack good ?

http://www.eurocarparts.com/ecp/c/BM...6cfef9b&000197

Diagnosis will show faults stored in DME could well be coil starting to break down under the heat and load of full throttle .

[73CSL]

thanks Gareth

Not quite sure what a single coil misfiring would feel like, but in this instance when you tried to accelerate it wouldn't , felt like all the ignition was being held back

I'll swap over all the coils and see

Are the bosch coils in the link I posted the correct ones ?

[giraffe]

thanks Gareth

Not quite sure what a single coil misfiring would feel like, but in this instance when you tried to accelerate it wouldn't , felt like all the ignition was being held back

I'll swap over all the coils and see

Are the bosch coils in the link I posted the correct ones ?

Yes mate

[Neil M]

Give Martin at MS Motorsport a shout first, see if he can match the price
Coils are: Bosch Part No. 0 221 504 464 and don't forget the plugs: NGK Part No. DCPR8EIX while you're at it! :thumbs:

[billyboysm3]

thanks Gareth

Not quite sure what a single coil misfiring would feel like, but in this instance when you tried to accelerate it wouldn't , felt like all the ignition was being held back

I'll swap over all the coils and see

Are the bosch coils in the link I posted the correct ones ?

Yeah, Euro also do those spark plugs but not online.

[73CSL]

spark plugs were done at the inspection 2 , 6000 miles ago, by gareth when he was @ elms

Neil, I'd already ordered the coil packs from euro ( went through cashback.com & got another 5% off ) before I saw your post .

Out of interest, would coil packs be covered by the warranty ? ( not relevant for me as I have a £250 excess )

[Neil M]

Out of interest, would coil packs be covered by the warranty ? (not relevant for me as I have a £250 excess )

No, They are a service item, fair wear and tear is the get out clause. just like tyres.

[Sailorbaz]

I recently, (Last winter) changed all coilpacks on mine at 50,000 miles and during my first run out in the Spring time, car started to run really rough and wouldn't pull at all.

Got home and pulled each coilpack one at a time and turned out 1 (cyl 5) had stopped working. Put the old one back in and it run normal again. Got in touch with the supplier who quickly sent me out a replacement and all is in order again.

My lesson, if it ain't broke, don't fix it.

[73CSL]

too late :whistle:

5 coil packs now changed for Bosch ones ...... 6th still waiting due to one of the correct boxes containing an incorrect coil pack ( a grey one that I think is from an e92 ) ... anyway that is now on its way back & a replacement should arrive soon.

The coil packs I took off do appear to be the original ones ( 67K miles ) as they are not Bosch.

Hoping all wil be well :thumbs:

[Neil M]

My lesson, if it ain't broke, don't fix it.

Ha, ha, Baz! However there is an equally appropriate adage for this situation "Prevention is better than cure"

Makes me wonder what BMW do on their inspection services? I'd have thought that they would have changed the coils as a matter of course at say c. 50K obviously not. :whistle:

[73CSL]

all 6 replaced yesterday, .... not sure wether its my imagination , but car seems quicker at the top end and smoother, of course that could have been the cold air