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[Marks DTM Calib]

I say DIS pack as I have seen some where the voltage was lower but the car worked ok, the result was correct operation but reduced fuel economy.

Do you still have the one I sent you in case you find its past its best?

[Webby the Bear]

I say DIS pack as I have seen some where the voltage was lower but the car worked ok, the result was correct operation but reduced fuel economy.

Do you still have the one I sent you in case you find its past its best?

That's very interesting, Mark. I'll see if I have time to get it out at the weekend. I certainly do mate (thanks very much for that).

When I asked my teacher about what other checks I could do.... he said it's just the resistance test. I take it (from what I remember you saying on my school blog) you think different?

Thanks so much for your help 

[Marks DTM Calib]

I know different (and so do you  ).....as mentioned in the 'how a coil really works' spiel in your school topic, the magnetic material is very important and rust and damage to this part will have no impact on a resistance test but will reduce (and it can be quite significantly) the spark energy

[Webby the Bear]

I know different (and so do you  ).....as mentioned in the 'how a coil really works' spiel in your school topic, the magnetic material is very important

[Webby the Bear]

thanks mate ill swap that out before i do anything and spend loads of dough 

[Marks DTM Calib]

Just looking at it is a good idea, try taking a pic of the underside of it with your mobile.

On the magnetic material thing, lets put it in laymans terms.

The iron core is a like a bucket in which energy is stored, the more iron, the bigger the bucket, the greater the stored energy.

If we now consider that the iron core is corroded then its the same as decreasing the size of the bucket, less energy can be stored.

Less energy equals a lower power spark.....which can in turn result in poorer combustion.

Its another possible which needs to be considered.

[Webby the Bear]

[That's a perfect explanation to me. And I can see how obviously partial combustion will affect economy.

It's interesting also that in the mornings when its particularly cold (3o and below) it seemed for the first couple of minutes that it was a bit low on power but i dismissed it as it went away very quickly.
it would also back up TBs suggestion that it seemed low on power when i first went for a techII
So thanks for that. ill check it this weekend 

[Webby the Bear]

Ps, if anyone is interested or this info could help anyone else out......

I called Northampton Motorsport (N'pton 766624) and they charge £5 per injector to test and clean.

Turn up with fuel rail/inlets in hand and they'll pop the injectors out and put them back for a little bit extra (assuming it doesn't take too long).

If it comes to it and we get further down the diagnostic road if all else fails I will get this done. The chap was real helpful on the phone.

But I'll of course do all I can to stem the flow of cash being spent on the old girl starting with Mark's advice 

[Webby the Bear]

Anyone any idea what a dry compression test should reveal (per cylinder)

I'm thinking 14.7 X 10.8(+1) = 173

Also, how would you go about disconnecting the fuel system on the Omega to do it? I assume you would also disconnect the disspac to stop spark?

Cheers guys.

[cem_devecioglu]

fuel pump fuse/socket off..
 
for compression test check this page
http://www.jspecauto.com/files/jspecautotechcenter9a.htm
 
and this one
http://www.gregsengine.com/cylinder-compression-testing.html

[Kevin Wood]

I'd pull the two purple relays at the back of the engine bay relay box. Fuel pump and ECU disabled.

If you just disable the fuel pump, the ignition will still be active, and may cause a shock, or kill the coil pack.

[Webby the Bear]

I'd pull the two purple relays at the back of the engine bay relay box. Fuel pump and ECU disabled.

If you just disable the fuel pump, the ignition will still be active, and may cause a shock, or kill the coil pack.

Thanks guys 

Any chance of a photo of the two relays I need to pull just so i dont balls it up 

So...

remove these two relays. then do i still need to disconnect the disspac or is there a relay or fuse i can pull for this? would make it that bit easier as the connector to the dispac is quite hard to get to 

[Lazydocker]

I'd pull the two purple relays at the back of the engine bay relay box. Fuel pump and ECU disabled.

If you just disable the fuel pump, the ignition will still be active, and may cause a shock, or kill the coil pack.

Thanks guys 

Any chance of a photo of the two relays I need to pull just so i dont balls it up 

So...

remove these two relays. then do i still need to disconnect the disspac or is there a relay or fuse i can pull for this? would make it that bit easier as the connector to the dispac is quite hard to get to 

You can't go wrong Webby... Engine bay relay box, 2 Purple Relays They stop Pump and ECU so the dis pack won't fire

[Webby the Bear]

I'd pull the two purple relays at the back of the engine bay relay box. Fuel pump and ECU disabled.

If you just disable the fuel pump, the ignition will still be active, and may cause a shock, or kill the coil pack.

Thanks guys 

Any chance of a photo of the two relays I need to pull just so i dont balls it up 

So...

remove these two relays. then do i still need to disconnect the disspac or is there a relay or fuse i can pull for this? would make it that bit easier as the connector to the dispac is quite hard to get to 

You can't go wrong Webby... Engine bay relay box, 2 Purple Relays They stop Pump and ECU so the dis pack won't fire

ok lazy thanks.... should i then run car until it cuts out to guarantee no petrol injected?

[henryd]

I'd pull the two purple relays at the back of the engine bay relay box. Fuel pump and ECU disabled.

If you just disable the fuel pump, the ignition will still be active, and may cause a shock, or kill the coil pack.

Thanks guys 

Any chance of a photo of the two relays I need to pull just so i dont balls it up 

So...

remove these two relays. then do i still need to disconnect the disspac or is there a relay or fuse i can pull for this? would make it that bit easier as the connector to the dispac is quite hard to get to 

You can't go wrong Webby... Engine bay relay box, 2 Purple Relays They stop Pump and ECU so the dis pack won't fire

ok lazy thanks.... should i then run car until it cuts out to guarantee no petrol injected?

You will struggle with those two relays out