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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 : 7298 Replies : 51Users Viewing This Thread : |
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Oct 24th, 2014, 18:44 | #11 | |
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Do these cars have intake sensors? |
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Oct 24th, 2014, 18:49 | #12 |
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Why don't you turn the actuator down one turn and see how you go?
I had the same problem on mine once and that cured the problem. |
Oct 24th, 2014, 21:17 | #13 | |
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Ashok suggested that too, unfortunately a few months back when the issue started I tried that. Took it right back to 15 psi and within a week it was doing it again... |
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Oct 24th, 2014, 23:13 | #14 |
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Why don't you find yourself another Known good MAF and throw I on temporarily to see if anything changes. May want to dump that air filter first though...
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2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles Click here for my x40 and V70 P3 repair guides |
Oct 25th, 2014, 03:01 | #15 |
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I would fit a manual boost controller and then you will know the BCS isn't spiking.or fit a EBC if you can afford it.
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V70 P2 facelift D5 6sp manual E4 Sport SE Ocean Race Blue pearl (2005) 97k, standard. |
Oct 25th, 2014, 09:57 | #16 |
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They have a sensor on the intercooler which I believe is an atmospheric pressure sensor they also have the map sensor in the intake pipe
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2002 V40 T4 17" Arcadia's ,Boost Gauge ,Forge Dump Valve And Blanking Plate ,Front Upper Strut Brace |
Oct 25th, 2014, 10:23 | #17 |
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I would imagine there would be a pressure and temperature sensor after the intercooler. Turbo Diesels do and I don't see why Petrol should be different!
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Oct 27th, 2014, 19:34 | #18 | |
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Was the car doing it before you had the turbo done? Or is it a new thing? |
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Oct 27th, 2014, 19:49 | #19 | |
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Glad you're well Yep, the car was doing it before the new turbo and new TCV. Something isn't right. It did it again this morning, just the once. The strange thing is, is that it always does it at around the same point of my journey, I do a lot of hard driving down the country roads once the engine is warm, then join a main road about 30 minutes into the drive, so normal driving resumes with traffic, then I take a roundabout to join the M3 and that's when I notice I've lost boost - Always after hard driving then 10 mins of calm driving. It's very strange! |
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Oct 27th, 2014, 20:49 | #20 | |
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Quote:
It was caused by a small valve on the fuel pump which opens to increase flow rate when the turbo comes online at (in that car) 1600rpm. Fresh from cold it worked fine, when fully warmed up it worked fine if constantly adjusted. After 10 mins of driving at a steady throttle setting it would stick and when I next opened the taps nothing would happen (As opposed to something slowly starting to happen in an only moderately interesting way, which is what Mondeo TDs excel at) So does the T4 fuel pump have a valve that opens with increased boost? possibly solenoid controlled? A new solenoid fixed both my cars when it occurred.
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