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[dan-eboy]

Hi, I'm gonna order a 2nd hand ecu from ebay, it's for a 2.5 V6 manual, does it matter if the ecu is for manual or auto? Thanks

[albitz]

Why are you buying an ECU ?
If you need to buy one,how much are you paying for it ? I dont have one myself but someone else on here might have one,if you need one.
I dont think it matters if the car is auto/manual,but Im not certain, so best to wait for someone who is sure to reply.

[I_want_an_Omega]

It doesn't matter, but should be from the same age, i.e. model year. It MUST have the immobiliser ECU as well and chip(s) from the key.

I've got a set available with a single key chip if you are interested.

[Omega_Dan]

I have one off my 2.5. Always worth checking on here. Best place

[dan-eboy]

I was looking at one on ebay which is £25 inc delivery, but it is for a 2000 model and mine is a 95 (N reg).

I'll difinateley buy from someone here if it's not too much more money, thrown too much at this car as it is!  How much and what is the immobiliser ecu and chips? is it all i'll need?  THanks guys

[Omega_Dan]

If you pm Robert as he offered first im sure he will help you Dan.

[I_want_an_Omega]

Mine is from a '99. Was the £25 with the immobiliser ECU and key chip?

[albitz]

But why do you think you need one ? They rarely go wrong afaik.

[dan-eboy]

Well i have a misfire, i've changed leads, plugs twice and dis-pack twice, (non-genuine the first time).  Today i checked the leads and they seem fine so the only thing i'm thinking it could be is ecu or broken/dodgy wire from ecu? It seems to be mis-firing on 3 and 6 and only fault code was 21 for TPS.

[dan-eboy]

Oh and i think £25 was just ecu, what is the chip etc for?

[Omega_Dan]

The chip goes in the key and the immobilser ecu is linked to the ecu which reads the key on start up. Immobilser ecu is fitted on the ignition in the steering coloum

[dan-eboy]

Not just a case of un-plug, plug-in then! nothings ever easy!  Can you put the chip in the key yourself or is it a main dealer job?  will it not work with just the main ECU then?

Also I was thinking is it possible to check the input to the coil pack, If i use a multimeter on the wires, theres 4 wires i think, so i would guess it would be earth, and 3 sets of leads (1/4, 2/5, 3/6) So if i get 1 wire with low/no voltage i Know it's a prob between ecu and coil, If i test either end of wires i can see if the prob is from the ECU or between ecu and coil, if that makes sense.  Thanks for replies much appreciated

[I_want_an_Omega]

It is simple enough to change:

1) Disconnect battery
2) Swap main ECU
3) Swap immobliser ECU (in steering column)
4) Swap key chip
5) Reconnect battery

They MUST be swapped as a set as they are all coded together

[dan-eboy]

Thanks, PM sent, hopefully this is the problem if not i might find a large tree to drive into!

[dan-eboy]

Not sure if this is connected to my other problems but the cars been really struggling to start on these cold mornings.  I turn it over for about 5 seconds, stop, do it again, then on the 3rd time it slowly comes to life. Any ideas what it could be?