Rocco Reviews said:

Apparently for the last 24 hrs the car was running on 3 cylinders and we weren't aware of it. My parents were about 45 mins from home when the light came on, and they said the car was running great, and they were going up hills. This morning I warmed up the car and about 3 mins later when the car was warming up it ran rough for about 10 seconds and evened out. We never take our cars to the FIAT studio. They charge too much. It's been running great so far. I'll keep this posted.

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If you run engine , warm up car, before going on your journey you will get absolutely terrible gas mileage.

You don't need to do the above.
It's bad for environment.
do drive gently for first few miles while car gets warm before driving with spirit.

You don't have to go to fiat studio.
Following the service schedule at any decent garage using correct fluids and parts will save money .
Just make sure to tell garage what type of service you require when asking for work.

jackwhoo said:

Spark plugs come in all sorts of varieties and service life expectancy.

If they were in great shape why did new plugs cure misfire?
Did you measure the spark gap of the old plugs?
What plugs were fitted ? Make and part number?
What is service life of new plugs that were fitted?

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We replaced the plugs, and reset the code. We switched coil 3 to plug 4 and coil 4 to plug 3, so if the light turn back on and it says that cylinder 4 is misfiring, than we only have to change the coil. The car has had they new plugs for only about 3 hours now, and the has barely been driven within those 3 hours. We didn't measure the gap of the plugs. The new plugs are from Bosch. We didn't have time to check the service life, or the part #, because my mom had to go somewhere, and just needed are working car for the short drive. When she comes home, I will go with her for a road test to see if the car throws a code again. The car seems fine for now.

My dads Toyota Tacoma 4.0 V6 is almost at 160,000 miles on the original plugs. I wish every car was like that.[/QUOTE]

I pitty the poor technician who gets the job of trying to get those plugs out if they have been undisturbed in cylinder head for years and years over that mileage and thermal cycling.

The new plugs are from Bosch. We didn't have time to check the service life, or the part #,

Find out which type of Bosch plug was fitted , look up it's service life or post type of plug on here and you will get info of how many miles they may last.

Swapping coil positions is good practise for the reasons you have given, well done.

jackwhoo said:

If you run engine , warm up car, before going on your journey you will get absolutely terrible gas mileage.

You don't need to do the above.
It's bad for environment.
do drive gently for first few miles while car gets warm before driving with spirit.

You don't have to go to fiat studio.
Following the service schedule at any decent garage using correct fluids and parts will save money .
Just make sure to tell garage what type of service you require when asking for work.

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The car already gets 19 mpg from normal driving. We let it warm up so if something goes wrong it the first 5 mins or something, it happens at home and not when driving. We started letting warm up ever since the car misfired away from home (we restarted the car, and it was running great, but we still couldn't trust it enough to drive it immediately when its cold) for about 5 seconds last year. We go to a local mechanic for oil changes, and when something goes wrong. I looked at FIAT's maintenance schedule for every oil change, and I will be honest, we've only done 2 oil changes for the 32,000 miles we put on the car and nothing else, and its been trouble free for those 4 years and 32,000 miles. Should we not be treating our FIAT the way we treat our Toyota?

I'll be creating another thread about how we've been treating our car, so you can give us tips on proper maintenance. Every oil change light, we've only done oil changes. This car has never had a proper top to bottom, front to back service before. This car barely goes on longer trips anymore.

If vehicle is serviced correctly at correct intervals ,
the chanced of a break down are greatly reduced ,
Breakdowns / faults are more expensive, more worrying, more irritating , more expensive than servicing,
It will be more efficient,
It is far more likely to remain road legal,
It will retain value longer,
It will be more reliable,

All that is needed is to find out what needs replacing / renewing at what age and or miles And either do it yourself or arrange for local to do it.

That goes for all vehicle makes.

You choose what you would rather do.

jackwhoo said:

I pitty the poor technician who gets the job of trying to get those plugs out if they have been undisturbed in cylinder head for years and years over that mileage and thermal cycling.

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I just remembered that truck has got about 3 proper services but i'm not sure if they did the spark plugs or not, so i'm assuming they've been there for 9 years.

Rocco Reviews said:

Yes, all of the codes mean the same thing across manufacturers.

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I have leant something today, if the p code starts p0 the meaning is standard across manufacturers.

If the code starts p1 then it is not standard across manufacturers, so if get a code starting p1 you have to look up what the manufacturer of the car you getting the code from has designated that code to mean.

There is a vast difference between manufactures.

My Ambient air temp sensor is bad anyone know what tow wire colors go to the sensor I would like to install aftermarket sensor