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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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T4 Boost cut off!Views : 7187 Replies : 51Users Viewing This Thread : |
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Oct 27th, 2014, 20:59 | #21 |
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Hmm interesting. I don't think there's a solenoid on the fuel pump but surely if something were sticking there would be a misfire sort of feel rather than a perfectly fine car that gets put in limp mode?
Does anyone have any info from diagnostics in VIDA/DICE that determines what triggers limp mode? I've ruled out MAF for now in the theory that when MAFs go they tend to either work or don't, they aren't intermittent in the way that this problem is. Gonna give the pressure sensor on the intake a good clean tomorrow before work, see how it behaves. |
Oct 27th, 2014, 21:12 | #22 |
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I honestly dont know how it'd manifest - I've never even driven a T4 let alone owned one.
All I can say is that on my cars, the manifestation of a stuck fuel pump valve was a smooth and steady total lack of performance. It really does sound like the symptom of some sort of failing mechanical device.
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Oct 27th, 2014, 21:13 | #23 |
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Have you ever changed the Fpr?
Like Dx said, sounds like fuel related or air leak |
Oct 27th, 2014, 21:24 | #24 | |
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The systems tight, no leaks anywhere, most of the hoses got pulled off and inspected when my turbo was replaced and I've checked most of them myself, plus surely an air leak would just give me less boost all the time? Boost always peaks at 1.35/1.4 bar WOT until the 'problem' trips limp mode. I assume a leak would give less boost/intermittent readings? |
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Oct 27th, 2014, 21:40 | #25 |
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Fpr doesn't mean cold start issues only.
Mine used to start fine hot and cold but changed anyhow. After that it felt so more responsive. The only way to check for an air leak would be with a smoke test to be a 100% I've had air leaks and still running on 18 psi boost, come to think of it I got an air leak on the way home from Gatos once and the car went into limp mode. The ecu might notice after a good drive then goes to base 0,6 bar if I remember rightly. Have a word with Ashok about Fpr and air leaks even the slightest air leak could cause a nightmare lol |
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Oct 27th, 2014, 21:43 | #26 | |
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Oct 27th, 2014, 22:09 | #27 |
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Don't know if it's any help Alex, but I know that sometimes if the problem clears by the time you go to get codes read it doesn't always keep it stored. (I've had this on mine)
Does the problem remain the same until you turn the engine off and back on? If that's the case if you can get it to happen again while your this way pop by and leave the engine running and we'll see what DICE shows? Just a thought. |
Oct 28th, 2014, 09:47 | #28 |
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Happened again this morning - 10 minutes into journey this time, only happened the once though.
Would have popped by Matt but had a company meeting this morning so had to be in on time. Plus, another 40 odd minutes of driving with 0.5 bar would have been horrible lol |
Oct 28th, 2014, 10:33 | #29 | |
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Oct 28th, 2014, 13:04 | #30 |
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Lol, had I been able to stop at yours I would have put up with it.
Strangely, it never does it on my way home. I'm logging the short term and long term fuel trims on torque pro at the moment so will be interesting to see if that shows anything. |
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