engine spluttering, ecu?

[daimo]

as some may know i swapped a c16nz2 for ac18nz engine everything as the 1.8 except the ecu.
it starts fine but runs spluttery with the 1.6 ecu but when i fit the 1.8 one dash light flashes and does not even turn over. is there something else to do or is it unrelated to ecu?
the wiring loom seem identical to me.

[Envoy CDX]

Did the engine come from a cav with an imobilisor?

[daimo]

it definately had an alarm but there were no obvierce signs of a imobiliser
my 1.6 shell has a alarm sensory button on dash thing

[Envoy CDX]

it definately had an alarm but there were no obvierce signs of a imobiliser
my 1.6 shell has a alarm sensory button on dash thing

Hmmm, if the 1.8 had the transponder round the ignition barrel that'll be why it didn't fire up.
However, did you use the 1.6 loom or the 1.8 loom with the ECU?

[daimo]

at the moment 1.6 wiring with 1.6 ecu
both engine looms looked identical but could be wrong, and ecus are different.
i will have to finely check wires at ecu plug end.

[Envoy CDX]

at the moment 1.6 wiring with 1.6 ecu
both engine looms looked identical but could be wrong, and ecus are different.
i will have to finely check wires at ecu plug end.

I'd be checking the wiring loom for the immobiliser pin.
I should have thought to mention about imbolisers.

[Robsey]

Sounds to me like the loom needs to be replaced with the 1800 loom, as this will / should match all the , ecu pins and all the ignition side of things.

What number or Alpha Code is on the 1800 ECU

Here is the EPC listing for ECU's
viewtopic.php?f=6&t=4815

Secondary thought - if it is an immobilzer light on the dash, then I assume, that the immobilizer is only matched to the 1600 ECU... hence your non-start with the 1800 ECU.

With the 1800 loom and ECU, this should bypass the immobilzer circuit.

[daimo]

numbers on the ecus are different so i will be getting 1.8 loom out and closely checking and no doubt changing.
it was just the management light flashing
thanks for the help

[Robsey]

Have you tried doing the flash codes on the dash.
There is a how 2 on the forum or on Topp Buzz

[daimo]

was going to but thourght the above would be the one to try.
but tomorrow i will try fault codes and see first . many thanks
i will get there slowly but surely.

[planetc]

flashing eml - transponder type immobiliser problem, would suspect the guys are right in the suggestions given. I do know from experience that you can fit a non immobiliser ecu in place of the later one and it'll run.

[daimo]

fault code shown up with 1.8 ecu as 85 immobiliser wrong signal, so any ideas as was what i can do?

[Gaz]

Have you got access to the 1.8 and is the key still about?

[planetc]

Sounds like it's a late ecu. If it came from a '95 MY or later then it'll be looking for the immobiliser signal, which from what you have said above it's probably not going to find. 99% certain the rest of the system is the same, so you just need the earlier ecu, Robsey's ecu list may help. Chassis no.s starting 89 or 87 (hatch and saloon) followed by S are '95, an R is '94 and anything before R will be earlier

[daimo]

the car was scrapped and only have the key

[Gaz]

if you get a suitable pickup it might work.

[daimo]

looking at documents it is the late ecu, so i presume i would be best to source a early ecu without immobiliser.
i surpose i saved everything except the immobiliser bit?

[Gaz]

its a pickup im not sure its actually coded to the chip and ecu, might be worth a go if you cant find an early ecu.

[planetc]

its a pickup im not sure its actually coded to the chip and ecu, might be worth a go if you cant find an early ecu.

As Gaz suggests the pickup or ring is programmed to talk with ecu, and to recognise keys, easier option to source earlier ecu. If you add the pickup/transponder keys to what you already have you'll need the security code for it and need it plugged into tech 1 to programme so that the ecu will play nice with it.

[daimo]

i have the black box ring around ignition, is that what i need. thanks

[Gaz]

yea thats the fella

[planetc]

i have the black box ring around ignition, is that what i need. thanks

Yes, the control unit is part of that ring.You also need a transponder from a key that it recognises, if you don't have one you'll need the 4 digit security code for the immobiliser ecu in order to program it. I have a feeling that the immobiliser ecu and/or the engine ecu need to be programmed to recognise each other too, but I may be wrong, it's a few years since I played with one of these.

[daimo]

i have got keys now and where would theimmobiliser ecu be

[Gaz]

its in the normal ecu, just plug the ecu in with the chip reader and get the chip out of the key and tape it to the flat bit of the reader and try it all again.

[daimo]

i held the 1.8 key to the box and fitted 1.8 ecu and ried but was trying to start but not quite but then returned to what used to start but wouldnt now battery flat. when trying with key on box it stopped dash light flashing so it must work just being awkward