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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 : 3087 Replies : 39Users Viewing This Thread : |
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Apr 22nd, 2024, 10:01 | #21 |
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Hi,
Hopefully the BCS/ TCV from chap who's had this issue will resolve the it but will certainly help us with diagnostics if it doesn't. My only question for now is whether the car re-mapped? I suspect the ABS issue is mutually exclusive. The older TRACS system used in the 850 and P1 V70 only uses the ABS sytem in operation. It sounds like you're beyond the speed threshold when your problem occurs. That the problem is still there with TRACS off logically eliminates it also. I've attached a document that should be of interest. Your DTC is specifically adressed on p12. Did the the Temp Sensor code come back? Unlikely to be the cause but it always surprises me how many things this affects. Best regards, Rich. |
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Apr 22nd, 2024, 10:34 | #22 |
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Hi Rich,
Not re-mapped - very standard. The temp sensor code did not come back...thankfully. I now just have the 424 (Pressure switch for TRACS, faulty or short circuit) remaining. The TCV should be here tomorrow so I will fit it as soon as I can and report back. Thanks for your input. Pete |
Apr 22nd, 2024, 11:32 | #23 |
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I'm with Richmac on this. To the best of my knowledge, on these cars TRACS works by applying braking to the spinning wheel via the ABS system, not cutting power to the engine. So I suspect that your two problems are not actually related, I'm pretty confident that the TCV or something related to it is causing your engine to cut out, this absolutely ties in with the symptoms and there aren't many things that can cause the engine to cut without leaving a relevant code, and none that I can think of that would only happen under hard acceleration apart from TCV as described.
An interesting one - keep us updated! Cheers
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Apr 22nd, 2024, 11:51 | #24 |
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I will definitely keep you updated! Thanks for your input.
I have attached a couple of photos relating to the earlier work done on the engine just for forum members information. One shows one of the vacuum hoses pre replacement and another the inlet port - not sure how healthy that looks. Pete |
Apr 24th, 2024, 23:39 | #25 | |
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Quote:
It's just that on my old '98 V40 T4 I was of the belief that the DTCS was controlled by cutting the fuel supply so assumed the X40 system stemmed from the P80 platform.
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Apr 25th, 2024, 07:13 | #26 | |
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I do stand to be corrected on all of the above though, others on here might now a more definitive answer. Cheers
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Apr 25th, 2024, 10:50 | #27 |
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Dancake has kindly sent me a TCV to try but I have a poorly dog here at the moment who is taking up all my time so please don't think I have left this thread hanging. I will definitely fit it as soon as I can and revert. Thanks to Baffler and Luxobarge for their latest contributions.
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May 10th, 2024, 18:46 | #28 |
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An update!
I switched over to the TCV kindly supplied by Dancake and there seemed to be an improvement in so far as the cutting out was less prevalent and at higher revs. But still there! I am going to look at the turbo actuator now to see if it is sticking. I can get a hand to it and move it c. 10mm but don't know if that is enough to suggest it's ok. I will be able to get to it better once I have removed the heat shield. I am still running with the non-Bosch replacement MAF sensor and am wondering if that might be contributing to the problem in some way e.g. unable to cope with the overboost? I will update once I have got to grips with the actuator. |
May 10th, 2024, 19:37 | #29 |
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I believe I'm right in saying that these cars are indeed quite picky about the quality and exact specification of MAF, and general opinion is that only original Bosch MAF is good enough, so if it were me I'd definitely be replacing that with a proper Bosch one of the correct part number, expensive though it might be.
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May 10th, 2024, 19:48 | #30 |
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Thanks Luxobarge. yes, I have heard and read that too. Being somewhat, let's be generous to me, careful with money, I have wanted to exhaust other, possibly cheaper, potential solutions before buying a Bosch one. Especially since it's not throwing up any MAF related fault codes.
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