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[Tony H]

Hi all can  anyone tell me if Tech 2 or for that matter any diagnostic machine will detect a dis pack fault on an Omega or other cars?

TIA
Tony

[TheBoy]

Indirectly it can help. But it won't say "The DIS/Coil pack is shagged, replace it".

On Omegas, for pre DBW cars, it will likely say no faults, even though there is a chronic misfire. In this scenario, check the HT side of things if the trims/MAF look OK.

On DBW, it'll likely suggest which cylinder is misfiring, though you still need to use common sense to ascertain if fuelling, HT or bugger engine.

[Tony H]

Had a miss fire for a while now. lumpy idle, no miss on slow acceleration, misses on moderate acceleration, floor it and the miss clears, but when the throttle is backed off the miss reappears. New plugs and leads fitted seems to improved a bit but still missing any advice would be greatly appreciated. P.S. could this be caused by a faulty dis pack?
 

[zirk]

Posting your Engine Type and Year might help together with any Fault Codes.

[Andy H]

On cars with one coil per plug (ie facelift Omegas) the diagnostics can often be used to switch off individual coils to aid diagnosis. I think Tech2 can do this 

[Tony H]

Posting your Engine Type and Year might help together with any Fault Codes.

2.5 2000 

[zirk]

Posting your Engine Type and Year might help together with any Fault Codes.

2.5 2000 

?

[omegod]

Hi Tony, I recall my 3.0 behaved like this when the DIS pack was on it's way out , I have diagnostic stuff and am in Huyton but work most weekdays in Bootle if you want it plugging in, as TB says it may record a misfire but not much else   give me a shout, Jon   

[Tony H]

Hi Tony, I recall my 3.0 behaved like this when the DIS pack was on it's way out , I have diagnostic stuff and am in Huyton but work most weekdays in Bootle if you want it plugging in, as TB says it may record a misfire but not much else   give me a shout, Jon   

P.M sent 

[Tony H]

Posting your Engine Type and Year might help together with any Fault Codes.

2.5 2000 

?

Had a local garage plug it in to his machine I don't know what type or how good it is but it was not a Tech 2. I came up with three fault codes a transmission an 02 sensor an one more that I can't remember but the bloke said it would not cause a miss fire.

[Andy H]

Posting your Engine Type and Year might help together with any Fault Codes.

2.5 2000 

You can use the paperclip test on your engine Paperclip test & pedal trick to read the codes but I don't think that ECU is capable of telling you much about the ignition or misfires.

I had a misfire on a 2.5 several years ago. After dicking about getting the codes read and looking for a complex cause I did some basic maintenance - I changed the spark plugs - that fixed it

[Tony H]

Thanks for your reply Andy  , but as stated new leads and plugs fitted but has not fully cured the problem.

[Diamond Black Geezer]

Never forget that more than one thing can be the cause of a problem. I've found that in the past with a poor idle, it was three separate things which were causing it. Hope you get sorted soon

[Marks DTM Calib]

Right well the Motronic 2.8.1 setup on the 2.5 wont detect a misfire.

To test the DIS pack you need a test plug with a 35-40mm gap, then its dead easy to do as they can all be checked using the 1-3-5 bank leads which are easy to get to.

I suspect the lambda fault is as a result of the misfire.

The symptoms described point towards the ignition setup as max volts are needed from the DIS at lighter throttle openings.

 

[TheBoy]

I too would be going with deeper investigation into HT side...