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Found 5 results

  1. dvderlm

    idle rpm

    Is it better to idle at 1050 rpm with 15:1 AFR or 950rpm with 14.2:1 AFR ?
  2. My Mk2f failed the MOT today (on emissions), which after all the work I've done on it the last year was a bit deflating to say the least. However the numbers are a bit mental: CO: 12.22% (Fail 0.3) HC: 996ppm (Fail 200) Lambda: 0.669 (Fail 0.97-1.03) My guess from the massive CO readings is a virtually non-existent cat (it looks original to me, certainly very old). Unplugging the lambda sensor on idle does nothing so perhaps that died too? So perhaps I've been used to this rich running for a bit too long and it never was fixed in the first place. In the last year its had new: Temp sender (OEM), Plug, Leads, Dizzy cap and rotor, all filters, multiple oil changes, Thermostat, head gasket, water pump, timing belt, ignition timing set to 5 degrees BTDC. Gave it a proper thrash this morning before the test. Last week I changed the centre silencer as the old one took a thump in France and developed a hole. Looking inside the old one there is something in there.... could it be some catalytic monolith perhaps? Only a year ago it passed emissions with flying colours - nothing I've changed should have made anything worse and with these SPI engines there isn't anything left that controls the fuelling aside from the cat and lambda right?
  3. So I was talking with an independent (non stealership) auto mechanic about my 2000 Polo and told him what a lovely little car it was with a cute little 999cc engine and telling him how good it ran now that I've chucked away about half a ton of plastic and hoses from under the bonnet and he assured me that there's pretty much no chance this car would ever pass it's next MOT because it would fail on emissions even if the engine were brand new as the factory made it because the new MOT rules are basically designed to fail all cars more than an hour and a half old so you're forced to either buy a new car or do without. After discussing the pitfalls of idiotic, incorrect and pointless emissions regulations like those foisted upon us by the drunken unelected fools of the EU I went away feeling pissed off that the first car I've bought in twenty-odd years was probably just money down the drain as I'd have to throw it away by next year's MOT even though it ran fine. But that got me thinking about some things. Firstly, I know little of, and care even less about, the science and regulations of modern exhaust emissions but it occurred to me that if a slightly knackered catalytic converter not doing it's job well enough could fail the MOT when nothing else was even wrong with the car then in theory why couldn't you just fit two (or five or ten...) catalytic converters in the exhaust train of your car sequentially so that at MOT time all that came out of your exhaust was fairy giggles and bunny smiles? You could have two exhausts, one made of catalytic converters you fitted once a year for the MOT and a sensible one for real life. Or how about running bioethanol instead of petrol for the MOT? An enine's an engine and it's not rocket science. They CAN be made to run on a wide range of burny fluids. I've even run a two stroke bike on white spirit and got a 50cc engine to fire up on vodka. In most older engines alcohol or propane will work without much alteration to the carbs, so has anybody tried running a fuel injection engine on something other than Morrison's best supermarket petrol? Just wondering. It strikes me that having cars run on petrol and then making the emissions rules so strict it renders them illegal is pointless and unnecessary. So, two cats or not two cats? That is the question. Or how about fitting an enormous bag like a hot air balloon clamped onto your exhaust during the MOT so there's no emissions whatsoever "when tested"?
  4. Gave my bready a bit of an Italian tuneup a few weeks back and since then there has been an intermittent ticking from the engine bay when warmed up - loud enough to be heard inside the cabin but obviously much louder when under the hood. I traced it by ear (as much as you can with these slightly paranoid goose chases) to that little green valve attached to the back of the engine bay. It has a couple of hoses going to it (one black, one transparent), both of which go to that cansiter on the bottom-left of the bay and an electrical connection. The ticking noise can be 'felt' through the pipes close to the unit - I assume its a valve ticking open and closed? So the questions: 1) What is it? As far as I can see its something to do with the emissions control system 2) Is it knakered? 3) Any idea why it would be springing into this form of life after running the engine at 4k revs for 10 minutes? I mean the engine runs great, never been better, so whatever it is it isn't really affecting anything. Happy to ignore it but equally happy to fix it!
  5. I own a 52 plate 1.2. Petrol Polo. I have owned it for just over 3 yrs. it's. Regularly serviced and pretty well looked after it seems too have a emissions problems . It's been to 3 different garages . Over the last 3 yrs for m.o.t . Each mot it seems to fail on emissions I've had 2 catalytic converters. Sensors and numerous. Other things changed . Has any 1 else had this and solved the problem ?
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