Firing on 2 x cylinders

[ScoobyJ]

HI, i have a CSR260 which suddenly started running rough, I think it is only running on 2 x cylinders, I pulled the coil off on cylinders 1 and 2 and no difference in engine running but pulling either 3 or 4 off the engine dies, i suspect it is the coil loom but does any one have any input?

 

thanks

[geko]

Hi,

 

a new coil loom is worth to try:

Link

 

I had troubles with the Ford COPs used for the CSR 2.3 Duratec before I switched over to (4 wire) VW COPs and Haltech ECU.

 

Failed ignition on two cylinders at the same time may point the problems with the MBE ECU. Hanns Per have similare troubles:

CSR owner Forum

 

 

 

Edited by - geko on 13 Sep 2014 18:21:37

[John Vine]

I'm not familiar with the 2.3 motor, but assuming the coils and wiring are the same as the R400D, this thread may give you some pointers.

 

As for identifying a non-firing cylinder, can you detect a temperature difference when you touch (v lightly) each primary in turn?

 

JV

[ScoobyJ]

Thanks guys

i will try a new loom first and see if it cures the problem, re feeling the temperature by touching the primary lightly, i'm not sure what you mean by primary, do you mean the top of the coil?

 

[John Vine]

The primary (one of four) is the run of exhaust pipe from the cylinder head, through the hole in the bodywork, and down to the collector. They can get very hot (if the cylinder is firing!).

 

JV

[ScoobyJ]

Thanks JV

i will have a look tomorrow and let you know the outcome

[Stationary M25 Traveller]

Careful when sensing temperatures on primaries 😳

 

Prefer to use a non-contact laser thermometer rather than fingers !!

[ScoobyJ]

HI, definitely not firing on cylinders 1 and 2, no heat at all in the manifold

checked the coil loom and all looks ok. any ideas?

[geko]

Hi,

 

change coils 3 & 4 with 1 & 2 and you will see if the coils/COPs are the problem.

 

 

 

Edited by - geko on 14 Sep 2014 15:05:10

[ScoobyJ]

Hi, swapped coils 1/2 to position 3/4 and still 1/2 cylinders not firing,

[geko]

Hi,

 

that´s bad.

 

Connectors - loom - (ignition modul, don´t know if present) - cables - ECU...from cheap to expensive.

 

 

 

Edited by - geko on 14 Sep 2014 16:17:12

[John Vine]

Just a thought... What roller barrels do you have? One-piece or two? If the latter, it's possible the linkage between the two is faulty/loose. Check whether the front RB opens in sync with the rear.

 

JV

[ScoobyJ]

Hi yes 2 part barrel, they do move in tandem.

thanks for all your help thus far

[tbird]

very unlikely, but have you checked for a spark at 1/2, be a hell of a coincidence but could two plugs have broken down, maybe swap plugs 1/2 for 3/4 Are plugs 1/2 wet when you take them out, just in case it is a fuelling problem, just a stab in the dark

 

 

Tim

 

Edited by - tbird on 14 Sep 2014 18:19:01

[ScoobyJ]

Thanks Tim, i have had all plugs out and cleaned, placed back in random order, still no joy on 1-2

 

[tbird]

oh dear, was just hoping for the last cheap option, have you checked for spark as well

 

Tim

[ScoobyJ]

Not yet Tim, i think its one for the techies at Caterham, i will give them a call tomorrow

[tbird]

fingers crossed its something silly and cheap

 

Tim

[ScoobyJ]

Hi with the very helpful chaps at Caterham, they found a broken return spring on the throttle barrels, getting sorted now. Thanks for all your input

[Jonathan Kay]

Glad you've found it.

 

Would that be expected to cause cold exhaust piping from those cylinders once it's running?

 

Thanks

 

Jonathan

[ScoobyJ]

When I had it idling definitely cold exhaust so must be mixture, I will ask the mechanic when he has finished