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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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help with S70 pleaseViews : 1725 Replies : 18Users Viewing This Thread : |
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Sep 25th, 2011, 14:25 | #11 |
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It did start again when he turned up and this was when he did his 'test'.
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Oct 1st, 2011, 15:43 | #12 |
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Fixed at last!!
After replacing the cat, the backbox, the plugs and the lambda sensor it turned out to be be the Mad sensor. If only I had checked that first.
Thanks for all the help and suggestions everyone. |
Oct 1st, 2011, 21:58 | #13 |
L Mason
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which sensor is the mad sensor and where is it fitted on the car?
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Oct 1st, 2011, 22:35 | #14 |
Volvo Nutcase
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Did you not know that any sensor automatically becomes a MAD sensor when it goes wrong....
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Andrew 1998 S70 T5 CD AUTO Previously a 1990 240 GLT-R |
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Oct 2nd, 2011, 06:04 | #15 |
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mad sensor??
I thought I had edited that post to read MAF sensor. Using my phone to post at the moment as our pc broke down about the same time, which means predictive spelling. I have now added MAF to the dictionary.
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Oct 2nd, 2011, 08:47 | #16 |
Where's that 18mm socket?
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My car often drives me MAD as well!! Welcome to the club mate!!
Your problem does sound very like Thanatos's problem he had with his MAP sensor! Is there much difference between a MAP and a MAF? http://www.volvoforums.org.uk/showthread.php?t=135072 Last edited by Andy Northface; Oct 2nd, 2011 at 08:50. |
Oct 2nd, 2011, 09:57 | #17 |
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Yes, there is:
A MAP sensor reads manifold pressure (vacuum). This is used in conjuction with air inlet temperature and engine rpm to calculate the mass of air going into the engine, this value is used to determine correct fueling A MAF sensor reads Mass Air Flow directly. |
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Oct 2nd, 2011, 11:05 | #18 |
Volvo Nutcase
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Note that:
On pre me7 cars the "MAP" sensor is not a proper map sensor, in my opinion anyway. It sits behind the drivers side headlight on a bracket attached to the bonnet catch and it reads the atmospheric pressure (for altering the fuel trim for changes in altitude). But Volvo call it a MAP sensor and when it goes wrong the fault codes will say "MAP sensor". ME7 cars have a proper MAP sensor located in the pipework going to the throttle body and do take a manifold pressure reading.
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Andrew 1998 S70 T5 CD AUTO Previously a 1990 240 GLT-R |
Oct 2nd, 2011, 14:20 | #19 |
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The sensor you refer to is a Barometric or Atmospheric Pressure sensor, the fault code confusion only happens when generic OBDII fault codes are read. Volvo diagnostics have a specific fault code for this sensor.
OBDII P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent Volvo code is EFI-422 |
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