CL500 Misfire - Diagnosis
08-14-2013, 07:02 PM
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69 280SL, 92 500 SEL, 98 CL500
CL500 Misfire - Diagnosis
CL500 98
150k miles
Been garaged and maintained - I'm 2nd owner for last 9 years.
Issue: Misfire
OBDII Codes:
PO155 (O2 Sensor, RBank, PreCat)
PO303 (misfire Cyl 3)
PO307 ( " Cy7)
PO300 ( " random)
Pulled all 8 spark plugs - all look great - clean - perfect
Replaced all 4 O2 sensors (design lifetime)
Still misfires - with flashing Check Engine light - meaning gas being dumped into the cats with potential cat failure.
Acts like bad injectors on 3/7 but no other error codes?
Thoughts? Ideas? Suggestions? Insights? Accusations? Visions?
150k miles
Been garaged and maintained - I'm 2nd owner for last 9 years.
Issue: Misfire
OBDII Codes:
PO155 (O2 Sensor, RBank, PreCat)
PO303 (misfire Cyl 3)
PO307 ( " Cy7)
PO300 ( " random)
Pulled all 8 spark plugs - all look great - clean - perfect
Replaced all 4 O2 sensors (design lifetime)
Still misfires - with flashing Check Engine light - meaning gas being dumped into the cats with potential cat failure.
Acts like bad injectors on 3/7 but no other error codes?
Thoughts? Ideas? Suggestions? Insights? Accusations? Visions?
