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| Thread ID: 50489 | 2004-10-22 03:16:00 | Off topic: What is wrong with the car? | nomad (3693) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 283528 | 2004-10-22 07:45:00 | Well, I hear a lot of cars pinking, especially when a driver goes round a corner in top gear because they dont know about changing down. Car mechanics, particularly when points were common, used to advance the ignition a bit too far when doing a tune up, so that the customer would feel that the car was peppier afterwards. Pinking is pre-ignition, ie the mixture ignites too early, and is trying to drive the piston down when it is still coming up towards top dead centre. The noise can be quite severe, and you will experience the 'jerking' you describe. You can also get pre-ignition when an engine needs de-coking (engines dont seem to need that these days) due to glowing hotspots of carbon, but if the owner is a lady doing lots of short local runs then it may well be coked up. Try giving a good blast down a motorway, or an extended high speed run to blow the cobwebs away. Perhaps it isnt hay fever, but it's much the same thing, stuffed up :) |
Terry Porritt (14) | ||
| 283529 | 2004-10-22 08:08:00 | Actually, Terry, your technical analysis may be quite correct. I couldn't personally comment... But I do know that your hay fever diagnosis was a lot more fun. (Friday night...hhmmm?) |
Laura (43) | ||
| 283530 | 2004-10-22 08:24:00 | You're right Laura,it is friday night, dont notice days when retired, they're all the same. Which reminds me, I'm beginning to feel another Hot Tune of The Week coming on, maybe do a quick one over the long weekend, I seem to remember that I was going to look at tunes having 'aint or t'aint in the title, like Ain't Misbehavin'. |
Terry Porritt (14) | ||
| 283531 | 2004-10-22 09:25:00 | And so you did. | Laura (43) | ||
| 283532 | 2004-10-22 10:34:00 | Well spotted GF ;) I thought it sounded vaguely familiar. I'd still plump for a new fuel filter. Cheap and simple. Having been there and done that in the middle of Texas as a callow youth. We checked carb, spark-plugs, points, leads - everything except the little plastic thingy in the fuel line. NZ cars didn't have them at all in the late 1970s. Live and learn. :D |
Winston001 (3612) | ||
| 283533 | 2004-10-22 10:57:00 | Obviously the car needs the latest drivers :p | Raikyn (6293) | ||
| 283534 | 2004-10-22 11:50:00 | :^O :^O :^O :^O Raikyn | Laura (43) | ||
| 283535 | 2004-10-22 11:51:00 | Maybe it needs a reboot, virus scan and SP3-v93. Install new drivers and replace the powersupply. Tell the owner to stop using 91, and have a happy day | R2x1 (4628) | ||
| 283536 | 2004-10-22 21:45:00 | Hi Nomad Call me stupid if you will, but having read both the old and new threads on this topic from end to end, nowhere can I find any information that allows me to clarify this question: Does the engine cough or stall, causing this unwanted jerk, or is it the auto transmission that is stalling? I have experienced both in the past, I once had a manual Honda with a carburettor fault that would stall the engine at take-off until thoroughly warm. This only happened in winter and it was fine in the warmer months. I also had an auto Holden that would not take up drive properly when cold. The revs would rise then the transmission would wake up with an almighty jerk and away we'd go. Also fine when warm, it was allegedly a sticking pressure valve or some such. It would also decide it was a two speed instead of three on odd occasions, but I digress. The key to amateur mechanic diagnosis of the problem is a clear picture of what is happening, i.e. is it engine or transmission. It is not rocket science to work out which of these is providing the problem in a car with a rev counter. If the revs rise but the car doesn't move it is the transmission, and if the car moves then the revs drop, that's more likely to be an engine issue. There's a fine line in there though, because the auto taking up after a delay will also cause the revs to drop. A little close observation will sort out which is which. Cheers Billy 8-{) Disclaimer: My internal combustion engine experience is limited to lawnmowers and model aircraft engines, neither of which have transmissions. |
Billy T (70) | ||
| 283537 | 2004-10-22 22:01:00 | > it was fine in the warmer months That happens here too ;) |
R2x1 (4628) | ||
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