Misfires

[Konstantin Gonikman]

The entire left bank misfires & the car runs rough. O2 replaced, MAF cleaned, new coils etc, no effects. All fuel injectors seem to be working ok (did a hearing test)

 

Any ideas? And does anyone know what "Oxygen sensor heater" exactly is?

[Loren]

Exact model and year of your car please...

[Konstantin Gonikman]

986 S, 3.2,  2000

[Loren]

I do not think you are getting the Porsche specific fault codes. Misfires on one bank many times indicates a cam timing or solenoid issue.

Best find someone with a Durametric or Porsche PST2 or Porsche PIWIS diagnostic tool.

[Konstantin Gonikman]

1 minute ago, Loren said:

I do not think you are getting the Porsche specific fault codes. Misfires on one bank many times indicates a cam timing or solenoid issue.

Best find someone with a Durametric or Porsche PST2 or Porsche PIWIS diagnostic tool.

 

I actually already did that and they see exactly the same codes. We could see live how cyl 5 generates a lot of misfires. What's weird is there're really no other codes. (read with the original Porsche tester)

[Loren]

Did you pull the plug and inspect the coil and wiring?

[Konstantin Gonikman]

Coils – yes (all new). Wiring – that would be a good idea. Will try that, thx

[Loren]

Poor wiring connection or loose spark plugs?

[Konstantin Gonikman]

Personally I don't think so, but will test it. But this is weird that it happens on the entire side (4-5-6).

[Loren]

I remember we did a RennTech.org Work on Cars Day and this young man was doing maintenance including oil and spark plugs. He had missing all on one bank and he was sure he had tightened the spark plugs and snapped the electrical connections tight. After further inspection he had forgotten to torque down the 3 spark plugs on that side of the engine - so it can happen.

[RFM]

Do not forget to check the catalist of the respective cylinder bank for clogging or breakage.

[GEORGE S]

You may want to check that sparkplugs are connected to the corresponding coil.

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[GEORGE S]

Also, check the hoses connecting the left or the right bank to the air-oil separator. If any of those is disconnected or strangled that bank will be making explosions as soon as you start the engine.

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[vza]

I have the same issue. Misfire codes on 4-5-6. Cleared codes now have pending codes as the same. This is after replacing Bank 2 Solenoid...Bank 1 lost timing but was re-timed. Both banks timed, New AOS, IMS,RMS,Fly,Clutch, now I can't drive it!! Ran better with disconnected MAF so I'm going to try a new one. Started a thread which explains all. Thanks V