tbourner Posted March 4, 2006 Share Posted March 4, 2006 Haven't driven the Supe for about 2 weeks, went out today, checked oil and fluids, started it. It started straight away, but was really lumpy and there was a lot of black smoke coming out the exhaust. I'm fearing the worst. Should I try and start it again? Leave it running for a bit? Quote Link to comment Share on other sites More sharing options...
uk-rich Posted March 4, 2006 Share Posted March 4, 2006 plugs may be fouled, had this on mine recently, cleaned them, ran perfect Quote Link to comment Share on other sites More sharing options...
tbourner Posted March 4, 2006 Author Share Posted March 4, 2006 It was fine when I left it 2 weeks ago - how can sitting for 2 weeks do that! TBH the bad running does feel like a misfire though - blown seals would idle ok wouldn't they? (please!!). Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted March 4, 2006 Share Posted March 4, 2006 It was fine when I left it 2 weeks ago - how can sitting for 2 weeks do that! TBH the bad running does feel like a misfire though - blown seals would idle ok wouldn't they? (please!!). Turbo seals, I'm afraid They always blow when you don't drive it for 2 weeks It just needs a run Just don't thrash the arse off it until its warmed up thoroughly Quote Link to comment Share on other sites More sharing options...
tbourner Posted March 4, 2006 Author Share Posted March 4, 2006 How about getting the plugs out and cleaning them up a bit? Or is that not necessary! Geoff you're a funny man (not!). Quote Link to comment Share on other sites More sharing options...
geoffvalenti Posted March 4, 2006 Share Posted March 4, 2006 Personally I'd try to run it at a fairly fast idle (2000 rpm) and see if it cleared itself. You've got no cats to damage so it's got to be worth a go. If not whip the plugs out and clean them if you like, but for the cost of a new set I'd replace them if I'd gone to the bother of taking the old ones out. Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted March 4, 2006 Share Posted March 4, 2006 Petrol especially high grade fuel starts to lose its octane. After 2 weeks 97 ron is quite pants. If its sat in the garages tank for nearly a fortnight and then in yours for well over 2 weeks it'll be right crap. Get yourself a tank top up of decent fuel and all should be OK. It won't hurt popping the plugs out and giving them a clean but watch those little white plastic jobbers in the plug bit that goes onto the coil pack (nice technical term huh) Quote Link to comment Share on other sites More sharing options...
Soop Dogg Posted March 4, 2006 Share Posted March 4, 2006 Get yourself a tank top Are you lost in the 70's by any chance? Quote Link to comment Share on other sites More sharing options...
tbourner Posted March 6, 2006 Author Share Posted March 6, 2006 Right then! The tank was almost empty anyway because I knew the fuel wouldn't be very good when I next came to use it, so went and got some 99 with a can - filled it up (well - 10 liters or so), started with a bit of black smoke but cleared up almost straight away. Took it out, down the motorway, around town, back home. Went out in the evening in it just down the road and back. Thought it sounded louder as we got home, back of the mind I thought it was overfuelling not sure why!! This morning, started ok, half way down the road started misfiring exactly the same as it was over Christmas. I'd sorted this issue a while back by taking the plugs out and regapping them all (2 of them were TINY gaps!). SO; what causes overfuelling (I need to measure the O2 reading when I get in)? Would that foul the plugs and cause this issue again with the misfire? Should I just buy some new plugs and hope it all goes away!? Quote Link to comment Share on other sites More sharing options...
tbourner Posted March 6, 2006 Author Share Posted March 6, 2006 From searching it seems overfuelling is the only thing that would cause bad idle but reasonably good running otherwise. Although when it runs it does feel slightly odd and on overrun this morning I had a backfire!! Other than that it boosts ok and revs normally - just idle is lumpy. Suggestions? Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 6, 2006 Share Posted March 6, 2006 Check your narrowband O2 sensor as described here. That'll tell you if you are overfuelling in closed loop. This can cause a bad idle with a propensity to stall, and that stalling issue can give the overrun a sharper deceleration and a chuggier quality. -Ian Quote Link to comment Share on other sites More sharing options...
eyefi Posted March 6, 2006 Share Posted March 6, 2006 sounds like o2 sensor. possibly dirty probably failing. you're going to have to check it's voltage (see manual). could also be coolant temp sensor or (very unlikely) air temp sensor. get that voltmeter out! Quote Link to comment Share on other sites More sharing options...
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