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Could be a bad ignition coil each cylinder has its own
An engine cylinder misfire has been detected in cylinder # 1
Type your answer here... An engine cylinder misfire has been detected in cylinder # 4 firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition
301 means #1 cylinder has a misfire check plug or coil
P0303 : misfire cylinder #3
Was an intake manifold gasket for me.
Cylinder #1 misfire.
In the past I have had an engine misfire due to a bad fuel injector. hope this helps.
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.
An engine cylinder misfire has been detected on the # 1 cylinder and the # 8 cylinder firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of Ford Expedition
po301 means cylinder 1 misfire
I had the same problem with a 1999 Expedition and it was a bad plug. Ford had a problem also with the plugs blowing out. It cost me about 1200.00