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997.1 2.7 Slight missfire at 1500 - 200 rev range Vehicle diagnostic Engine roughness

richardjjs1

richardjjs1

Member
Member
[h1]987.1 2.7 Slight missfire at 1500 - 200 rev range Vehicle diagnostic Engine roughness[/h1]Plugs and Coils replaced
MAF Replaced
OS Sensors replaced (Did show a Bank 2 Sensor 2 fault before replacement

Read the diagnostics no faults shown
BUT
what does this mean please
All 5 motion detections are 3
Engine roughness reference value is 5.9014 5.9311
Engine roughness cylinder 1 -1.081 0.953
6 1.140 0.992
2 1.141 1.939
4 -2.028 -2.581
3 1.456 1.816
5 0.336 0.493
Counter MIss fire detection

Then all 6 Missfire Counters are 0
First reading was latest
 
Sorry, can't help with the diagnostic analysis Richard. Apart from the obvious plugs and coils, sometimes misfires are as a result of a faulty Variocam solenoid. There's one for each bank.

Jeff
 
Interestingly NO FAULTS but when running it does sow misfire on 2 and ocassional on 3 and 1 Doesnt record it and clears quickly

Think I need to look at the vario cam solenoid - maybe swap over with Right bank one and see if it changes sides!
 
Richard,

I think that swapping the solenoids is your first port of call. If the problem follows the potentially faulty solenoid you'll have your answer.

As always, intermittent electrical problems are a pain.!

Jeff
 
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