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jonquirk last won the day on January 12 2014

jonquirk had the most liked content!

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About jonquirk

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  • Toyota Model
    Yaris S D4-D, MR2 Roadster (2002)
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    Road Trips

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  1. Did you read my reply to the end? My car is taking accurate readings, available at the diagnostic port, then sending them to a display that deliberately over reads. Cost doesn’t come in to it. It’s a deliberate choice by Toyota, but why?
  2. They can do it. The question is why do they choose not to. I have already referred to the chart in the workshop manual that basically states the speedo is working correctly when it over reads by between 5 and 10%. I have seen figures from the OBD-II port that closely correspond with the GPS readings so I know the underlying figures are correct before they are altered on their way to the display.
  3. The only way to be certain of not getting stopped for speeding is not to exceed the posted limit. The 10%+2mph is only a guideline. While not exceeding the limit it would be nice to be as close to it as possible if conditions are suitable. That means having accurate speedometers. If I do an indicated 70 I am actually doing 65mph and spend most of my time in lane one on the motorway. Without that knowledge I might be tempted to spend longer in lane two if there are lorries in lane one, thinking that I have a 14mph speed differential, rather than the actual difference of 9mph (lorry tachographs, unlike car speedometers, are calibrated).
  4. I have always believed that speedometers were permitted to have up to +10%/-0% error which seemed reasonable for an analogue device. It also makes sense that speedometers should not under read to avoid drivers going faster than they think they are. I find it hard to believe that regulations would mandate that speedometers must over read, rather than saying they must not under read. After all, accurate, calibrated instruments are fitted to police cars; expense is the main reason they are not universally fitted. There are factors beyond the manufacturer’s control that could lead to a speedo under reading, such as overinflated tyres on the drive axle, or non standard tyres being fitted. This could lead to them choosing to build in a margin of error that would keep the driver legal and prevent the manufacturer being drawn into a speeding prosecution. Back to the Yaris: we have seemingly accurate figures coming from the speed sensor, and visible at the diagnostic port but a speed display configured to over read within the legal limit. Someone stated that it is possible to dig into the software settings on a VW and correct the speedo error, which makes me wonder if it is a legal requirement that they must over read, rather than not under read? I will continue to be guided by my GPS and do what the car shows as 32 in a 30, 43 in a 40, 54 in a 50 in order to make progress where possible, sure in the knowledge that I will not be speeding, especially given the way the police usually only stop those exceeding the posted speed limit by 10%+2mph, 35 in a 30 at which speed my car would be showing 38mph.
  5. The workshop manual for the mk1 Yaris has an interesting little chart which shows the acceptable readings at various speeds: 20mph: 20-23mph 40mph: 41-44mph 60mph: 63-67mph 80mph: 84-88mph and so on. I wondered why the speedo reading differed from both my GPS and the signals available via the OBD-II port. It is annoying that Toyota appear to make the speedo deliberately over read when the correct figure is available at the diagnostic port.
  6. Hi all, I am preparing to replace the oil in the gearbox of my 2003 D4-D. I reckon access will be improved by removing the air cleaner box. While checking this out I spotted what looks like a filler bolt on top of the box, in addition to the level plug I could see on the side, and the as yet unseen drain plug on the bottom. I think that it may be easier to fill from the top bolt while observing the level hole for oil level reaching that point. The things is: I have seen no mention of this top plug on any guides. Can I use it to refill, or does it have some other purpose. I only have two replacement gaskets to hand so I may have to fill through the level hole anyway, but it would be nice to know Thanks in advance for any help you can offer. Jon.
  7. Worship manual shows rear brakes can be discs or drums. Cars with rear discs have bigger front discs according to ECP. OP has T-Spirit so I imagine that would have rear discs rather than drums.
  8. The cause of leaks into the boot is well known: leaking past the seals on the light units. Remove and clean up the seal and the metal it seals against to remove the dirt that has lifted the seal off the metal and allowed the water in. Bigger, more effective seals are available from Mr T.
  9. Thanks to stantheman1 my Yaris looks quite a bit smarter wearing its new wheeltrims. After nearly 124000 miles the old ones have picked up a few scrapes. I shall have to take extra care while parking at the kerb from now on!
  10. Two (or more) tones sounding simultaneously is fine. Many vehicles have dual tone electric horns. Some models have single tone on the basic models with dual tone appearing on the spec as you go up the trim levels. in an update to my earlier post about the compact twin set: it has been replaced by a big single horn, 17” long bolted transversely to the undershield between the engine and the radiator. That should wake a few dozy plonkers up. Years ago I acquired a 24v Klaxon. Even on 12v it made one hell of a noise. I wanted to put it on our van but my dad said I would probably give some poor fool a heart attack so it ended up on a burglar alarm instead. You can buy them but my abiding memory, apart from the racket, is that they are quite heavy.
  11. From: The Road Vehicles (Construction and Use) Regulations 1986 (2) Subject to paragraph (6), the sound emitted by any horn, other than a reversing alarm or a two-tone horn, fitted to a wheeled vehicle first used on or after 1st August 1973 shall be continuous and uniform and not strident. Strident, not discordant. Poor memory at fault.
  12. Air horns are not illegal unless you mean the sequential type that play a tune. Single or multiple tones are legal as long as they sound simultaneously. There is no limit on how loud they are but they must not be discordant. I have a twin air horn set on my car. I bought a unit that consists of two compact horns mounted directly on the compressor. I used a blade terminal to plug into the existing spade terminal on the feed to the original horn and used a ring terminal to a nearby bolt to earth the compressor. The original horn remains in situ and could be reinstated simply by plugging the spade terminal back onto it.
  13. Is it low on fuel? When did it last run? Any strange behaviour before it refused to start?
  14. Bob, you have a 2014 Yaris, the OP and I have mark 1 cars a decade older. The most I have put in is 41.39 litres.
  15. The gauge has eight bars. 45 litres is 10 gallons. So at 40 mpg a full tank gives a range of about 400 miles. If the gauge went down in a linear fashion four bars would be about 200 miles. In fact the tank is half full, or half empty, depending on your outlook, when five bars are showing. When only one bar remains it blinks and you have about 30 miles before the car runs out of fuel.