misfire after 5-10 mins
 

Hi All

slk 230 year 2000

starts fine runs for 5-10 then starts to misfire

code reader says po301/302//303/304 no other codes come up

not been used over winter was fine before

best place to start

thanks

gary

Hi Gary, not sure of the codes but would of course be good to Google them to find out what the car's computer is reporting iasues about.

Misfire after 5- 10 minutes aounds like it could be heat-dependent. Is it a slight misfire or severe? If oil is leaking at valve cover gasket into the spark plug holes that could be one cause. Or perhaps an ignition coil that malfunctions when it gets warm?

Good luck with her.

The codes are msifire of each cylinder respectively. Double check battery and battery connections?

Cars use standard values when cold for the fuel / air mixture. When hot start to modulate depending of signals from various sensors. A bad MAF for example would effect all cylinders.

Not sure if the car has been garaged in the city or country. Perhaps verify there is no mouse nest in the air intake tubing prior to the air filter or in the exhaust or so. :-)

miss fire
 

Hi

Thank you was nearly a year ago all sorted was ecu in the end was lots of other things as well pse unit would not rev up but all sorted

now wife very happy

Good all is sorted and that miss' happy.

Cheers.

that she is first time in years had to let a garage fix a car of mine they had it a month before it was sorted

so felt a bit better after that good job i had another car to drive lol