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Mito 1.4tb with remap. Cylinder 1 failure.
Have tried plugs(three sets), new coil packs, am currently trying additional earth for ECU.#
PLease help as using my local mechanic is costing loads :(
 

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I presume its running all be it on 3 cylinders so we can presume its getting fuel. Need to find out if cylinder is getting a spark. If it is then its a good chance its something serious with that cylinder, piston or valves perhaps. :(
 

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Not an expert on this and basing it more on TS/JTS experience. If not the spark, coil pack then perhaps the injector?
 

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What is missing on Cylinder 1? You need:

Compression,
Fuel
Ignition

Find out which one you are missing and then you will be able to diagnose it much quicker. You seem to be chasing an ignition problem. A decent mechanic would not have "replaced the plugs three times, replaced the coils and then tried re-earthing the ECU".

What good would re-earthing the ECU do to solve a misfire on one cylinder? Have you gone to quick fit or something.

Find a better garage and don't pay a penny. Get them to put the old bits back on.

A good mechanic would have tested ignition by pulling the plug out and holding it against the block and watching for a spark. They would also test compression with a compression tester.
 
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