Non starter problem with injector 4

2004 Fiat Punto 1.2 sporting
Car: Fiat Punto
Year: 2004
Variant: 1.2 sporting
Categories: Running Rough, Starting & Power Loss
Hi there some help is needed here, Recently i suffered with problems starting the car and i was advised by the AA to change the spark plugs to which i did however as soon as the spark plugs were changed i had a engine management light come on the vehicle.

The car drove a bit sluggish untill i accidently drove thru a large pool of water and then started to judder and when i put my put down to accelerate there was nothing there.

I managed to get the vehicle home and called on a friend who has a diognostic machine and got a reading out of it showing problems with injector 4

He has changed the ignition leads and the car will start all be it sounding very rought and blowing a lot of grey out of the exhaust however if it is left running for a while it is fine but when i go to restart it in a hour or the next day it wont start.

it is showing as problems with injector 4.

any ideas please, he suggests changing the plugs again and that is needs a new injector however somebody has now mentioned that it should start even if there is a fault with the injector,

Please help it seems my mechanic is rather that identifying the problem just wild guessing by suggesting changing this and changing that so far it has had new spark plugs new leads exc exc exc,
Problem added: Feb 15, 2013 (11 years ago)
They are common for coil packs faulting,but best to actually get the fault happening and be able to see what,s not happening,or if there is a code pointing at something ,anything else is guess work and can be costly.
Answered Feb 15, 2013 (11 years ago)
Check ignition coil packs for shorting , if not that check compressions
Answered Feb 15, 2013 (11 years ago)

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