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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Ignition CoilViews : 1173 Replies : 22Users Viewing This Thread : |
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Jun 28th, 2024, 11:16 | #11 |
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My apologies - I mis-read your original helpful post, not realising at that time there were actually 2 position sensors! (can't quite see why). I've gone and ordered the camshaft one now - I guess given the modest cost if I end up doing both there is little lost. Thanks again for your help, will update when the saga concludes. P.S. Just decided to order both sensors as the cost isn't much compared with a garage bill.
Last edited by Nick850GLT; Jun 28th, 2024 at 12:12. |
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Jun 28th, 2024, 15:02 | #12 |
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Yes, let us know. Apologies in advance if it doesn't fix it!
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Jun 29th, 2024, 20:03 | #13 |
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Update 1
Well the new crankshaft/RPM sensor arrived today and is now fitted - sadly still no improvement. The Royal Mail didn't deliver the camshaft sensor, so that awaits Monday. Fingers still crossed!
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Jun 29th, 2024, 20:18 | #14 |
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Jul 3rd, 2024, 16:11 | #15 |
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Cam sensor now replaced
The Camshaft sensor finally arrived today and is now fitted. Sadly no improvement at all, it is just added to the list of things I've changed to no avail. The engine continues to run rough - it still sounds like it isn't running on all cylinders. but I've now been through all the likely electrics and sensors, as well as doing a compression test.
I think it is time for the garage to see if they can find it! |
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Jul 3rd, 2024, 17:41 | #16 |
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It's a tricky one. As I'm sure you know it's usually either spark or fuel related but if you've checked you have spark at the plugs and your fuel pressure is good at the rail then without taking off the rail and checking the injectors are ok and they are firing as they should maybe the best bet is a garage if you have a good indi you can trust?
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Jul 3rd, 2024, 17:46 | #17 |
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Just one more test that I'd be doing just to be sure - take the black spark plug cover off and run the car in the dark. It'll have to be quite late at this time of year, (the darker the better) but in the dark it's amazing how many stray sparks can show up. I know you've changed the HT leads etc but they're probably after-market ones and some of these can be of questionable quality. The "run it in the dark" test is quick and easy, and of course free - if you have NO stray sparks you can be confident that the HT side is fine IMHO.
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Jul 3rd, 2024, 17:59 | #18 | |
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At 240,000 miles, the injectors could be clogged too! Checking them involves a bit more work! |
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Jul 7th, 2024, 15:21 | #19 | |
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Jul 7th, 2024, 16:38 | #20 | |
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As far as I understand it, the idle control valve could cause erratic idle (revs varying), but perhaps not the rough/judder I've got. Also, did you change the coil? The garage has my car at the moment - and have just had a total failure, car now won't start and they think the coil has died. I'm just hoping that isn't a mis-diagnosis caused by something else, like the brand new crank sensor! (Too many times I've seen the newest item die, with a journey up the garden path resulting) After that cleaning the throttle body and chasing fuel problems may be on the list. Thanks to others for various suggestions. Will update as and when..... |
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