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[Temetsy]

So, i'm getting fault code 13 (motronic 28.1.) o2 sensor 1 open circuit, question is that can a weak spark cause so much unburned fuel to push to exhaust that lambda simply "gives up" because it's trim range cannot correct the mixture enough and it just throws itself to open. Thought that it's the weak spark since lambda works fine without fault codes when revving when idle but when i start to accelerate from ~2000 rpm with fourth gear it throws up EML and code 13. No other codes are shown and the lambdas were checked just yesterday that they were operative. Values varied between 350-450mV on o2 sensor 2 and 300-600mV on the o2 sensor 1 when idling. Am I even close on my diagnosis or do i have f00ked DIS pack AND lambda?

[zirk]

  Is it misfiring?, you wont get any fault codes that are spark, lead or diss pack related.

[Temetsy]

Nope, 13 is the only code I'm having. Tho the spark feels weak because the engine lacks A LOT of power and runs rough/when accelerating I feel misfires but no code. Just changed plugs and new leads should arrive next week. The guy who read the codes agreed too that it's propably ignition issue.

[chrisgixer]

other way round I'd say, in that the buggered or not working for whatever reason 02 sensor is not giving a reading for the ecu to work with. no?

[Temetsy]

Yes that might be too, tho it does give readings to the ecu and only fails when engine is under heavy load.

[Temetsy]

Problem solved, new plugs, leads and DIS pack did the trick Now running like straight from factory!