Hi all, i'm in desperate need of help.

I have a Fiat Punto Y reg, 1.2, 16v ELX with a continuing misfire.

History; (apologies, not very technical)

• Taken to garage with engine misfire
• Replaced spark plugs and leads
• Engine misfire stopped briefly, then started again
• Back to the garage, who replaced ignition coil pack.
• Misfire returned soon after
• Took to another garage
• Replaced ECU (not cheap)
• Engine still misfiring!!!
• Tried another ECU to check if part was faulty, still misfired!

Also engine management light is on - but garage tell me this is a faulty lamda sensor.

So, spent quite a bit of money and not got anywhere. Any ideas what I should do? What it could be? Should I just cut my losses and scrap it?

Help/advice appreciated if anyone has experienced something similar?

Thanks

The garage should be shot because the ECU missfire fault only costs £100 to repair and the repair guys will test it before they do anything.

More importantly they should have ruled out the cheap stuff (like the lambda) before proceeding with costly stuff. It should also be compression tested to look for head gasket problems.

Ok cheers for the reply.

The faulty lamda sensor isn't causing the misfire though is it?

As for repairing the ECU, had to trust the garage in this case that replacing it was the right thing - turns out it wasn't as it hasn't fixed the problem.

I thought ECU was a common problem on the Fiat Punto, so when they said that this is what needed to be done, it seemed reasonable...at the time.

Ideally i'd like to try and get some money back if this work didn't need to be carried out...not sure what the process is?

Maybe I should just invest in a gun.

Machinegun should be better investment for misfire problem.....(gun - tend to misfire too).

Too much petrol will cause a missfire and a faulty Lambda will cause it to use too much petrol. There's no certainty that was the cause (and maybe it was checked out), but anyone who just swaps stuff until they find the fault is not doing much of a good job.