Baffled by ABZ

[SimonT25]

IT,

Many apologies to you all for duplication of post. How do i delete it? Sorry Rookie user!

Many thanks for your post, I am hoping to hear back today from a chap testing my ECU's VAG no ending 557.

It does seem very strange as sometimes it fires for a second and then for maybe up to a max of 4 secs take a few 100ths of a second. Once the engine has stopped firing and I continue to crank the engine it does not fire again unless it disengage the starter and turn it over again. It is at this point that the noid light connected to any of the injectors stops triggering and the pulse in the LED disappears.

It screams immobiliser at me.

I have plugged VAGCOM into it and on the immobiliser block i am getting status 1 for all 3 pre requisites for engine to start.

15:09:36
1 Engine Start permitted
1 Engine (ECU) responds
1 Key/Transponder Status
N/A

Above is extract from saved file for this ABZ.

I had the Immobiliser removed from the ECU and i plugged it back into the loom. Instead of the engine stalling after 1 sec everytime, it ran a little longer for up to 4 seconds. I took the ECU back to the company who told me it must be something else.

Back to the very written on and find another space on the drawing board.

Hope this further explanation triggers a more definitive response from you guys.

Please bear in mind that no matter how significant or not you think your experiences my have been with this problem please do post it as it may help.

Many thanks,



I do suspect a head gasket as I have a little bit of oil in the water tank and the oil is emulsified. Would this stop it running though?