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Old Feb 21st, 2014, 01:56 PM
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P0107 and bypass valve has been replaced

Hi

I am getting an issue which at around 50mph the car jolts and I get the traction control light on if I push it I then get an engine light and a limp mode The code is P0107 which is manifold pressure to low.

I have run through the diagnosis in the Bentley manual and all voltages check out and indeed I don't get an issue when stationary. I have a trace which shows the problem only occurs when the car is at >86c and the pressure reading is 0 (this is the difference between atmospheric and manifold pressure). Before that I get no issue with the pressure varying like it should.

So is it the MAP or the TMAP sensor? Could it be the bypass valve again? Anyone got any insights into this.

Haven't made enough posts to show you the image
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Old Feb 21st, 2014, 03:26 PM
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Hi ya

have you pulled of the plug on the Tmap sensor (just in front of the intercooler)
make shore its clean and dry.
if so remove the Tmap sensor and clean it carfully, i would also check you map sensor to its by the thermostat housing make shore the pipe work is ok and not split or damaged.
check the vacuum pipes at the bypass valve, and the valve is not sticking but i think it will lead you to one of the sensors.

hope this helps
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Old Feb 22nd, 2014, 09:00 AM
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Hi Andrew

here is the snap shot :-)
Attached Files
File Type: pdf snap shot pixels.pdf (149.6 KB, 58 views)
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Old Feb 22nd, 2014, 12:06 PM
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Talking Fixed

The culprits were the two o-rings on the TMAP sensor. One looked fairly shredded and the other was on its way. Replaced both 2x10 (I think as my digital caliper refused to work today) and then went on a 15 minutes mixed driving run with my OBDII data logger and the car is back to its usual self.

Went through 50 whilst braced for a jolt and nothing so went up and down the speed and rev range and all is now well (fairly empty dual carriageway).

Thanks to marque for his PM's and help with the image.

The new plot looks totally normal now.

I did check all the things mentioned as well but the Bentley Book allowed me to check the two sensors and they were operating normally which led me to look at the TMAP sensor to see if there was an issue.

I did check with BMW and the two map sensors are 62.51 inc vat each (Solihull BMW) and of course if I had bought a new TMAP it would have the o-rings on it and would have worked.
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