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11-09-20, 08:08 PM | #41 | |
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1985 WR quattro 2010 A6 3.0Tdi Allroad 2010 A3 1.4 tfsi Sport - Sold but still in the family 1984 80 Quattro - Sold many moons ago 1981 Coupe GT - Sold to buy above |
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12-09-20, 12:27 PM | #42 | |
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The rear sensors are both the same, so you could swap in the other sensor & re-test the output if you are getting a square wave from it in its original position. It would confirm if its a sensor issue.
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1985 WR quattro 2010 A6 3.0Tdi Allroad 2010 A3 1.4 tfsi Sport - Sold but still in the family 1984 80 Quattro - Sold many moons ago 1981 Coupe GT - Sold to buy above |
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13-09-20, 08:22 AM | #43 |
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If you’re getting an actual waveform output, then I’d say the sensor is able to detect just fine. (What equipment are you using to monitor the waveform?)*
Unless you are certain the rings are perfect, and gap settings correct, that’s where I’d be looking. The teeth clog up with road grime, grease and rust. The ablative caps, too. The rings aren’t impervious to rust. Easily replaced for £10 or so. I did one on mine, on the car, not so long ago. Probably easier done on the bench. You’d be surprised at how well the system works with badly degraded rings. It’s my experience that as long as there is a discernible signal output for the ABS controller to compare, you should be ok. Orientation of the sensor might have an effect. As would happen distance. Ablative caps have been reproduced. They’re no longer priced as if a disposable item, sadly. Be careful if inserting the sensor without a cap. It can be done, but your first indication of contact with the rings is wearing away the blade tip of the sensor. As the idiots in wales helped me discover. One of my sensors has a very badly damaged tip. The system still functioned fine. Where is the signal being measured? At the cable joint, or at the main plug/socket on the ABS controller. Don’t discount 1980s quality electronics and dry solder joints.
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13-09-20, 10:45 AM | #44 |
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I’m using a small oscilloscope to measure the outputs at the ABS ECU plug.
It may be a matter of adjusting the sensor. It may be a crud filled ring. To fix either I will need to remove the sensor, clean the ring through the hole and refit it while checking the output. I don’t want to remove the shaft to check the ring. I want to have a spare sensor to hand in case I break the old one when removing it. I can tap it back in mm by mm, stopping when I get the square signal I need. Orientation is fixed by the mounting which is still in one piece, so that’s one less thing to worry about!
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2006 A3 (daily drive) 1987 MB ur Last edited by BackintheFold; 13-09-20 at 10:50 AM. |
13-09-20, 12:06 PM | #45 |
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what behaviour were you getting that led you to suspect the sensor?
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I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor |
14-09-20, 06:38 AM | #46 |
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You have been very lucky, loose cam caps!!! You need to have a look at the shape of the upper cam caps on all four, also, timing belt tension, not to mention the possibly that the oil pressure would have been very low in the engine due to the cam bearing having an oil feed to each one.
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14-09-20, 08:50 AM | #47 | |
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I think i started a thread on that a while back-I'll go back there and update when i next get a chance to look at it.
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14-09-20, 08:54 AM | #48 |
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Colin:
Not loose as such, just not tight! I was working on the car with the help of an ex-BA mechanic with a HUGE amount of experience on engines-including DeLoreans as a side note-and he inspected the caps and was happy they were undamaged. We took the opportunity to fit a new camshaft oil seal, and the timing (and belt) is reset spot-on. I'd been keeping an eye on oil pressure recently too, and it was not exactly off the scale, but well within specs. An odd one for sure, and now i know what the problem was, a test would have been to try and lever up the camshaft through the dizzy hole. There may have been a little movement detectable there which would have been a massive clue!
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2006 A3 (daily drive) 1987 MB ur Last edited by BackintheFold; 14-09-20 at 10:50 AM. |
14-09-20, 08:19 PM | #49 | |
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Sounds like you've done all the right things. Hope you can also get your abs sorted. My sensors weren't too bad to remove after plenty of penetrating oil over a week or so. I no longer renew the caps, like you I use a scope to match outputs from different wheels.
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1985 WR quattro 2010 A6 3.0Tdi Allroad 2010 A3 1.4 tfsi Sport - Sold but still in the family 1984 80 Quattro - Sold many moons ago 1981 Coupe GT - Sold to buy above Last edited by urquattr085; 14-09-20 at 08:24 PM. |
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