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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 : 2844 Replies : 39Users Viewing This Thread : |
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Apr 16th, 2024, 16:39 | #1 |
VOC Member
Last Online: Jun 12th, 2024 16:26
Join Date: Dec 2002
Location: Tiverton
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850 T5R momentary cut out under hard acceleration
Any help will be greatly appreciated!
Much already done recently when she wouldn't start at all or ran very badly including: - New MAF sensor - All new vacuum hoses - New distributor cap and rotor arm - New plugs and leads - New O2 sensor (Bosch) – there’s only one pre-cat - New fuel pump - Checked fuel pressure now and c. 40 psi – ok - Cleaned and serviced injectors (new seals and filters) - Changed oil, filter and air filter - new crankshaft position sensor - new camshaft position sensor - new radiator She runs really well now and the problem manifests only under hard acceleration in sport mode when I kick down, revs are above, say 3500 to 4000. It's like I have hit the brakes - it does it 2 or 3 times, the gearbox then shifts up and revs drop and all is good again with strong turbo boost. Checked the codes and I have got: A3 (ABS) 142 Faulty brake pedal switch, open or short 424 Pressure switch for TRACS, faulty or short circuit A7 (Combined Instrument (Trip Computer)) 122 Temp. sensor interval too long The A3 codes may be historic from when I took off and cleaned the brake pedal switch during re-commissioning as it was faulty. Could there be a link or are these faults probable 'red herrings'? As I said, any help will be greatly appreciated (and apologies for the long post! Pete |
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