hi i have a skoda pickup fun 1999

over the xmas period the imobilisor has gone wrong and the car would not start i have tried the spare key but the enigne still wont start.

the enigne turns over and the lights on the dash do as they should but there is no spark from the coil.

i had a mate plug his computer in and this confirmed that is is the imobilisor stopping the engine from starting.

since i have owned the car it has always only started with the key in the ignition skoda badge up with the key upside down it wont stat as per the fault above. with the key in the right way up, uptill now it has always started first time.

Im guessing its the barrel or the ecu at fault??

can anyone help me to disarm it so i can get the car moving again.

thanks for taking the time to read and any coments would help alot.

Tom

are you certain its the immob, as it should start and run for a second if the immob is active, sounds more like a dizzy or even the coilpack itself

( both very common faults on a 1.6)

what code reader is your mate using? get him to see if it will measure rpm when cranking the engine over

Agreed - when I've started my 1.6 without a transponder in the key it will start as normal and tick over for 1-2 seconds before the immobiliser stops it. Bear in mind there could have been an old immobiliser fault logged - unless you cleared all the codes and that one specifically came back upon trying to start again, I wouldn't put too much emphasis on it. It may however also be worth noting that a worn-out or discharged battery has been known to cause immobiliser hiccups.

As I suspect I may have a very similar problem - couldn't start the other day after I'd compression tested it, although the battery could barely turn the engine over and promptly died completely - can anyone say if it's likely to kill the coil if the output isn't earthed when the engine is turning over? The lead fell off where I clipped it to the block a couple of times (since my rear mount is knackered and the engine jumps about a lot). I've still got the battery on charge at the moment, so I don't know for sure yet if I've lost spark or not.

edit: Thankfully, a fully charged battery and it's all good again. I suspect the ECU might get a bit flaky if the supply voltage drops too low even though everything else appears to work, so I'd definitely double-check the battery.

Edited 4 January, 201115 yr by RobinSLXi

i agree with the above, the car will run for 2 seconds then die if the immo is active, it's more likely in your case to be a broken ignition switch or similar, as suggested above the ignition coil/dizzy is a good starting place to fault find...

what engine type do you have? does the fuel pump run when you try to start the car?