Odd one today

73CSL · 04-02-2015, 08:40 PM

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 · 04-02-2015, 09:00 PM

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

73CSL · 05-02-2015, 10:21 AM

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

giraffe · 05-02-2015, 03:28 PM

Quote:

Originally Posted by 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/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 · 06-02-2015, 10:59 AM

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 · 06-02-2015, 12:31 PM

Quote:

Originally Posted by 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 ?

Yes mate

billyboysm3 · 06-02-2015, 04:59 PM

Quote:

Originally Posted by 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 ?

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

04-02-2015, 08:40 PM	#1
73CSL S5 - Full Throttle Join Date: Feb 2013 Location: North Yorkshire Posts: 464 Casino cash: $8747	Odd one today 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 ?

04-02-2015, 09:00 PM	#2
Neil M Driving it like I nicked it Join Date: Jan 2012 Location: Manchester Posts: 2,340 Casino cash: $19143	Sounds like one or more of the coils is on its way out. Have they ever been changed. __________________ “With the CSL, BMW have achieved The Ultimate Driving Machine” SG CSL '051'

05-02-2015, 10:21 AM	#3
73CSL S5 - Full Throttle Join Date: Feb 2013 Location: North Yorkshire Posts: 464 Casino cash: $8747	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 Last edited by 73CSL; 05-02-2015 at 11:15 AM.

06-02-2015, 10:59 AM	#5
73CSL S5 - Full Throttle Join Date: Feb 2013 Location: North Yorkshire Posts: 464 Casino cash: $8747	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 ?