Technical Misfire above 60ish+ MPH

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Technical Misfire above 60ish+ MPH

JSingh1

New member
Joined
Jun 28, 2022
Messages
6
Location
birmingham
Hello,

Trying to sort out the misfire issue some people experienced 1.4 8V grande Punto of a flashing engine light and misfire codes when hitting 60ish+ mph & does shake a little. The engine light goes off once speed drops.

Had a service done on it 4 months ago, and I got the original NGK spark plugs for the garage to use as per the part number on Fiat Elearn for a 1.4 8V.

I changed the coil packs & leads today, wasnt any high end ones but was a brand new Lemark coil & leads. Same problem as before. Scanner showed Misifire on multiple cylinders, a code for each cylinder.

Not sure what to do next? I've heard it can be a timing belt problem, where it's not been fitted properly? It was done before we got the car in January, by previous owner.

MES will not let me carry out a phonic wheel relearn as it says RPM too high. RPM sensor?

So far:
1. New spark plugs
2. New coil pack
3. New leads
4. Oil & Air filter service

Thanks
 

eeeno

Active member
Joined
May 16, 2020
Messages
216
The reason why phonic wheel relearn is not done may be that the engine is not yet running on its operating temperature. It's wrong, don't do it.

Is it losing coolant somewhere? The engine may be worn. Check compression. Pcv hose leak, but you already checked that thing when changing the spark plugs.

May need a cambelt change? Or did a that problem occur after cambelt change? Then it needs phonic wheel relearn.
 
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