P0304 Nissan Tiida Cylinder 4 Misfire

Question

Hi there
I have a 2006 Nissan Tiida that has a intermittent misfire,

I have replaced spark plugs with platinum NGK's - No change

I have replaced Coil - No Change

Ive checked for air or vaccum leaks - Nothing

I have checked to see if my injectors are working and can hear them pulsating

I have cleaned MAF sensor - No change

I have decarbonised engine - No change

I have put fuel injector cleaner x 4 bottles - No change

Anyone have any ideas ???

Answer 1

Hi there,

I would do a leak down test. If the misfire happens after sitting a long time, over night or during an 8 hour work day then you might be dealing with a head gasket issue. If it's leaking a small amount of coolant onto the top of the piston, then when you fire it up first thing it may cause a misfire because the coolant can't burn. With all that you have done it's time to start looking inside for an issue.