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[danzigfan]

Hi guys, it has been a while...For the second time in two weeks it happened that EML started flashing without stopping when I put key and turn it to position before crank. If I try to start the car, it cranks, bit doesn't start.
Solution to this is to take the key out, lock/unlock the car and then it's fine. No EML flashing, starts on first turn.
Is this just a presign of troubles to come?
Any fix for this before it becomes serious?
Thanks in advance, Stan

[Doctor Gollum]

How many GM keys on the ring?

[danzigfan]

Only one came with the car. I do have another copy made later. Is it key transponder issue?

[johnnydog]

Long story short, but I had this a couple of years on my 2.6. A replacement crank sensor didnt help. Initially it was just intermittently, but eventually the car would not start at all, and the dash lights were illuminated like a Christmas tree. A replacement engine ECU cured the problem and it was fine afterwards.

[danzigfan]

Well...now I'm really sorry I didn't pull ECU out of my 2.5 when it went to the scrapyard

[TheBoy]

Is the only issue flashing EML and no sign of it firing?

If so, its likely to be either the transponder in the key or the pick up ring around the ignition, but worth checking the integrity of the loom around the immobiliser ring.

You'd be very unlucky for it to be the main engine ECU, as these are virtually bomb proof on the 2.5 and 3.0

(2.6/3.2 are pretty reliable as well, but not quite as good as the older ones)

[Doctor Gollum]

Only one came with the car. I do have another copy made later. Is it key transponder issue?

If there's more than one key for a GM car on the key ring, then the transponder may be getting confused.

[TheBoy]

Defo worth trialling a 2nd key if you have one.  Not on the same keyring as DG says.

[danzigfan]

No, second key is nowhere near the key ring...It ruins the purpose of second key🤷 I'll check the immobilizer ring when temperature ouside rises a bit. Second key was made by local locksmith, transporder chip was easy to duplicate and it was cheap to make. But it works.
First on to do list is leaking HBV tomorrow...priorities, then all the rest, neverending I guess

[Doctor Gollum]

No, second key is nowhere near the key ring...It ruins the purpose of second key🤷 I'll check the immobilizer ring when temperature ouside rises a bit. Second key was made by local locksmith, transporder chip was easy to duplicate and it was cheap to make. But it works.
First on to do list is leaking HBV tomorrow...priorities, then all the rest, neverending I guess

Any keys for other cars on the keyring

[TheBoy]

No, second key is nowhere near the key ring...It ruins the purpose of second key🤷 I'll check the immobilizer ring when temperature ouside rises a bit. Second key was made by local locksmith, transporder chip was easy to duplicate and it was cheap to make. But it works.
First on to do list is leaking HBV tomorrow...priorities, then all the rest, neverending I guess

If other key works consistently but the first key doesn't, haven't you already found your issue?

Or have I misunderstood something?

[danzigfan]

Other key is for"just in case"...both work for now. Issue is intermittent at the moment

[TheBoy]

Other key is for"just in case"...both work for now. Issue is intermittent at the moment

Can you use the "other" key for a week or 2, to prove the fault to the key, or to the car itself?

[danzigfan]

Nice idea...thanks. will report

[Doctor Gollum]

No, second key is nowhere near the key ring...It ruins the purpose of second key🤷 I'll check the immobilizer ring when temperature ouside rises a bit. Second key was made by local locksmith, transporder chip was easy to duplicate and it was cheap to make. But it works.
First on to do list is leaking HBV tomorrow...priorities, then all the rest, neverending I guess

If other key works consistently but the first key doesn't, haven't you already found your issue?

Or have I misunderstood something?

It may have been lost in translation, but yes. Any other car key with a similar transponder signature can potentially cause an issue.

So any transponder key NOT for.the Omega on the same key ring could cause interference.

Also lots of keys and a slightly worn ignition switch might just alter the position of the chip in relation to the transponder ring enough to disrupt it.