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[Dr_X]

Hi does anyone know if I can put the multimeter on the coil pack to test it....on motorbikes they usually have a spec in the manual for resistance etc but I've had a search and can't find anything for the omega.

2002 2.6 cd estate

cheers J

[Kevin Wood]

They usually fail by braking down at high voltages so testing at a low voltage might well not be conclusive anyway. Often, the plastic case has cracked and let moisture in when they fail. this is quite easy to spot visually.

They can be fired using a tech 2, IIRC, so you can try them with a HT tester to make sure the voltage is up to scratch.

[Dr_X]

The coil pack looks in really good shape, the plug wells were clean and dry......

Getting 0300 0302 0304 0306 on the code reader but didn't want to just throw £130 coilpack on if its not gonna solve the prob..

any opinions would be appreciated.....

[feeutfo]

Is the plug on the loom seating correctly to the coil PAC socket? Any damage to the plug? They can be brittle.

 No water getting on the plug? From scuttle or Leaking hbv? Any water residue anywhere?

Are the codes historic? Or continually coming back after clearing?

[RobG]

Hi does anyone know if I can put the multimeter on the coil pack to test it....on motorbikes they usually have a spec in the manual for resistance etc but I've had a search and can't find anything for the omega.

2002 2.6 cd estate

cheers J

This any help. Plug "pins" to ECU "pins"
Pin 1 (Brown) to 0V
Pin 2 (Black/red) to 12V IGN (meter continuity to Pin2 on other coilpack as is common feed and other coilpack is OK).
Pin 3 (Blue/red) to ECU Pin14 (X85)
Pin 4 (Blue/white) to ECU Pin15 (X85)
Pin 5 (Blue/green) to ECU Pin16 (X85)

[Dr_X]

Is the plug on the loom seating correctly to the coil PAC socket? Any damage to the plug? They can be brittle.

 No water getting on the plug? From scuttle or Leaking hbv? Any water residue anywhere?

Are the codes historic? Or continually coming back after clearing?

The plug is in really good condition and was dry when I took it off, the pins are clean and the coilpack looks good...

I thought the rough idle was due to a dodgy lamda (p0135) so I looked under the car today and all four look brand new, so I cleared the 0135 code and ran the car again until it was really warmed up and read the codes again.....

0300 0302 0304 0306

the 0135 didn't come back........

[Kevin Wood]

Is the car currently misfiring?

For 2,4,6 to all be misfiring I would suspect something common to that bank, the Lambda sensor being the most likely suspect, TBH, but would need some live data from the engine ECU to diagnose.

I'd say it's unlikely for all 3 coils in the pack to die at the same time - unless they've been bathed in oil / water.

But, based on the info above from Rob, you can check the 3 primary resistances between pin 2 and pins 3, 4 and 5. I'd expect a couple of ohms but, more importantly, they should be the same.

I can't recall whether the secondaries are between pin 1 or 2 and the plug leads, but you should see a couple of k Ohms here, again, differences between them would be more significant.

I don't expect this to be conclusive, but anything glaringly obvious might be a pointer.

[feeutfo]

Not that familiar with lambda issues, but does the car need to be warm before the lambda works fully? Need to get passed that open/closed loop stage, whichever it is, before checking lambda code is present.

[Marks DTM Calib]

Agreed, all three coils breaking down at the same time is a long shot.

You can only realy test them with a test plug as a common failure mode is corrosion of the cores, this affects the quantity of energy that can be stored in the Iron prior to the spark generation (e.g. turn off of the supply current) and hence gives a much weaker spark and yet, the coil resistance will be unchanged.

[Marks DTM Calib]

Not that familiar with lambda issues, but does the car need to be warm before the lambda works fully? Need to get passed that open/closed loop stage, whichever it is, before checking lambda code is present.

Yes, O2 sensors only work when hot (hence the heaters in them) and consequently the system operates open loop during the initial heatup. They should start working long before the stat opens though. 

[Dr_X]

Weird thing is the P0135 is the other side to 0302 0304 0306 ??

[Marks DTM Calib]

Weird thing is the P0135 is the other side to 0302 0304 0306 ??

Thats very interesting......any work done recently....gearbox out?, front pipes off?

Any chance the O2 sensors have been connected incorrectly?

[Dr_X]

Weird thing is the P0135 is the other side to 0302 0304 0306 ??

Thats very interesting......any work done recently....gearbox out?, front pipes off?

Any chance the O2 sensors have been connected incorrectly?

Not by me...as I said only got it two weeks ago.

The only clue i've got is in the service history....it went to vx to sort the rough idle, they cleared 10 codes(dont know which ones) put some plugs in it and relieved the guy of £95........

[Marks DTM Calib]

I think thats something to check.....the fact that the ecu is getting a feedback signal (now reported out of range) from one bank and an opposing back is running crap hints that it could be a potential cause.

Would be easy to check with live data.

[Dr_X]

can I run it with all four Lambda's unpluged?? then plug them back in two at a time?