Working on a 2004 S500 with check engine light with misfire for #4 and 7. Perform quick test and verified complaint. Very randomn with this misfire. Perform compression and cylinder leak down and its good. Install 2 new coils spark plug wires and all spark plugs. Have customer drive and return and codes came back after 1 month. Same codes for misfire. Inspect plugs and they look fine. Install 2 new injectors for the two cylinders 4 and 7. Customer drive car and again misfire codes. thinking...
Misfire #4 and #7.
Misfire #4 and #7.
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