SL/R129: Rough idle and accel
11-30-2016, 04:03 PM
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1998 sl500
Rough idle and accel
Today the 1998 SL500 started idling poorly as I slowed for a red light. Usually cannot feel it idle, now it is rough, feels like a misfire.
Autozone codes listed from OBDII
P0455 Evap system leak-gross, no flow
P0442 Evap system small leak
P0307 Cylinder 7 misfire
It seems to me to be a misfire. I also think that I do have an evap issue, maybe the fuel cap or further issues which may have been on-going. I have had the low fuel light flash occasionally which I believe is indicative of evap issues.
In this case I believe the primary issue is likely a misfire. P0307. Idle is rough, accel is rough. Car otherwise runs well, no lights in the car....
Any suggestions appreciated, I could expect perhaps a coil bad?
Thanks!!!
Autozone codes listed from OBDII
P0455 Evap system leak-gross, no flow
P0442 Evap system small leak
P0307 Cylinder 7 misfire
It seems to me to be a misfire. I also think that I do have an evap issue, maybe the fuel cap or further issues which may have been on-going. I have had the low fuel light flash occasionally which I believe is indicative of evap issues.
In this case I believe the primary issue is likely a misfire. P0307. Idle is rough, accel is rough. Car otherwise runs well, no lights in the car....
Any suggestions appreciated, I could expect perhaps a coil bad?
Thanks!!!
11-30-2016, 08:14 PM
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1998 sl500
For future search assistance...
I switched #6 and #7 coils, checked OBDII again and sure enough the problem followed to #6 cylinder. New coil installed and all is fine.
I am going to install a new gas tank cap hopefully with solve the evap issues which at this point don't seem to have any effect on car operation.
I switched #6 and #7 coils, checked OBDII again and sure enough the problem followed to #6 cylinder. New coil installed and all is fine.
I am going to install a new gas tank cap hopefully with solve the evap issues which at this point don't seem to have any effect on car operation.
