P0300 fault code????

[rob6775]

Hi all if u have read my previous thread u will know about my problem, car gets up to temp then misfires and cuts out at low revs.l have managed to get a code as it has never come up with one before its P0300 random/multiple cylinder misfire detected any further ideas to the fault???

 

[Typhoon]

De Ja Vu.

Coil Pack(s)?

 

[rob6775]

Already it was new 9 months ago? Plus new crank shaft sensor new plugs new cat/exhaust.What can i check now???

 

[rob6775]

Update.. i checked a few things yesterday didnt find much but i did find that the spark plug on No3 cylinder was soaked in oil so changed and ran ok all day.But could just this one plug cause a multiple misfire fault??

 

[rob6775]

Really out of ideas now,ran ok for another 3-4 weeks then broke down again same symptoms,running fine agian after an hour got it to a garage with renault Click diagnostics,they had it for 3 days running it and using it,ran fine with no issues or faults.Think im just gonna have to sell it as i need something more reliable

 

[clioben182]

Coolant temp sensor?
Oxygen sensor?

 

[rob6775]

Not sure about coolant sensor but had new pre cat sensor if thats what u mean by oxygen sensor?

 

[clioben182]

Yea thats it there is 2 though 1 pre cat and one after cat. The post cat one will tell the ecu what fuel/air mix to put in.
Coolant temp sensor could be giving wrong info to the ecu and it could be running rich or lean and giving a missfire.

 

[rob6775]

Ahh i was told that it was the pre cat sensor that was important and the post cat dint do much.