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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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850 T5R momentary cut out under hard accelerationViews : 2809 Replies : 39Users Viewing This Thread : |
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Apr 18th, 2024, 17:32 | #11 |
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A quick update. I have just taken her out again and with the fault codes cleared and TRACS off, there is no change, the quite violent hesitation occurs around 4500-5000 rpm in sport mode and seemingly just as it wants to change up a gear. No issue when stationary - she winds up to 6k without an issue. When cooled down I will check the wastegate actuator - it does seem a little stiff.*Dancake, I will definitely be interested in your TCV!
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Apr 18th, 2024, 17:42 | #12 |
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I'll see if I can retrieve it tonight or tomorrow.
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Apr 18th, 2024, 17:45 | #13 |
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I forgot to mention that immediately after switching on the engine the ABS warning light came on and when I got back after the test drive and checked the codes the 424 ('Pressure switch for TRACS, faulty or short circuit') was back!
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Apr 18th, 2024, 18:23 | #14 | |
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In the meantime try clean your existing TCV with some carb cleaner and, once dry, spray some dry PTFE through it, if you have some to hand, or a couple of drops of 3in1 oil and shake out any excess.
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Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav. |
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Apr 18th, 2024, 18:30 | #15 |
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Thanks Liam. I also forgot to mention that the ABS warning light went out after about a quarter mile on braking.
From what I have read, the TRACS pressure switch is integrated into the ABS module (haven't looked for that yet!) but you are right that the brake pedal switch did play up and I cleaned it and now the brake lights work. But I believe it does have something to do with TACS - I need to research that! Thanks for the advice on the TCV. |
Apr 20th, 2024, 21:23 | #16 |
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You can by a new oem tcv for about £40. Made by PIERBURG. Just Google it.
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Apr 20th, 2024, 23:34 | #17 |
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Correct, exactly what I did, and it's still working fine.
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Apr 21st, 2024, 10:39 | #18 |
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Thanks Shinsplintz and Luxobarge. Dancake is kindly sending his TCV for me to try first. I still wonder if the (recurring) 424 (TRACS) code is signalling a cause or contributory cause of the problem though!
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Apr 21st, 2024, 13:26 | #19 | ||
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Quote:
Quote:
A new TCV would help confirm whether your existing TCV is doing it's job, or not, and would be £40 well spent if nothing only to have it in your spares bin. You can then focus your attention on the TRACS fault. I would hate to see you throwing more parts at it so there are some great and recent ABS fault finding threads from Duke1, Luxobarge and El Padrino which may help to effectively identify and diagnose the issue.
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Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav. |
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Apr 21st, 2024, 22:03 | #20 |
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Thanks Liam, great advice.
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