gasgas
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I'm very gradually getting interested in doing my own fault finding of car computers. There's less knuckle banging than changing wheel bearings. Specifically my granddaughter's VW Polo sometimes has the engine management light on, which would obviously fail the MOT. I want to sell it, as I have already had to buy her a newer car.
Some time ago I bought an OBDII analyser, just a £35 one but even so not the cheapest and I have sometimes just pressed the 'clear the fault' button on this and other vehicles. This makes the offending light go out, but like a bad penny it comes back later.
Today I pluggedthe tester in and actually read the owners manual that came with it and found it had a P0106 fault code but all the list of tests it did seem to be OK to me -but what do I know? Not a lot, of course. Of the 21 things it read, all were OK or N/A except
Load PCT 36.5,
Load ECT34,
SHRT FT1 -2.3%,
MAP (kPa) 47,
RPM 1363,
Vss 6Km/h
I am guessing, but looking at Google my best guess sounds as if MAP means Manifold Pressure, and looking at google it would seem that the manifold pressure might be wrong. I've no idea if 47kPa is high or low, or what it should be. I suppose I should now look up what manifold pressure at 1363rpm should be.
In fact a few months ago when this issue first appeared I paid a garage to do an analysis and all he said was that one of the three cylinders was low on compression. I guess that the manifold tested would be the inlet manifold, and this google article says there is a sensor there which should be producing 1v to 4.5v. I wonder if wiring in an AA cell or two would convince the car that it is OK?
Any thoughts? I suppose if the compression is low on one cylinder it would reduce the vacuum in the inlet manifold, that's all I can think of. Meanwhile I am quite impressed with this little OBDII tester, it was £35 I seem to remember.
What is really annoying is that although the car drives quite well, it would fail the MOT just because the inlet manifold pressure is a bit low. How on earth does that make the car unfit to be on the road? Similarly apparently other things that can cause the EML to come on include the petrol filler flap not closed properly, even if the actual cap is screwed on tight. It's all very annoying. Next they'll start failing a car because the paint has faded.
If you want to read the google, here it is:
club.autodoc.co.uk
@trevskoda what do you reckon I should be looking at, short of searching Google Maps for a scrap yard? I think I'll spray some AMS cleaning fluid down its throat.
Some time ago I bought an OBDII analyser, just a £35 one but even so not the cheapest and I have sometimes just pressed the 'clear the fault' button on this and other vehicles. This makes the offending light go out, but like a bad penny it comes back later.
Today I pluggedthe tester in and actually read the owners manual that came with it and found it had a P0106 fault code but all the list of tests it did seem to be OK to me -but what do I know? Not a lot, of course. Of the 21 things it read, all were OK or N/A except
Load PCT 36.5,
Load ECT34,
SHRT FT1 -2.3%,
MAP (kPa) 47,
RPM 1363,
Vss 6Km/h
I am guessing, but looking at Google my best guess sounds as if MAP means Manifold Pressure, and looking at google it would seem that the manifold pressure might be wrong. I've no idea if 47kPa is high or low, or what it should be. I suppose I should now look up what manifold pressure at 1363rpm should be.
In fact a few months ago when this issue first appeared I paid a garage to do an analysis and all he said was that one of the three cylinders was low on compression. I guess that the manifold tested would be the inlet manifold, and this google article says there is a sensor there which should be producing 1v to 4.5v. I wonder if wiring in an AA cell or two would convince the car that it is OK?
Any thoughts? I suppose if the compression is low on one cylinder it would reduce the vacuum in the inlet manifold, that's all I can think of. Meanwhile I am quite impressed with this little OBDII tester, it was £35 I seem to remember.
What is really annoying is that although the car drives quite well, it would fail the MOT just because the inlet manifold pressure is a bit low. How on earth does that make the car unfit to be on the road? Similarly apparently other things that can cause the EML to come on include the petrol filler flap not closed properly, even if the actual cap is screwed on tight. It's all very annoying. Next they'll start failing a car because the paint has faded.
If you want to read the google, here it is:
OBD2 code P0106: causes, symptoms & how to fix it
club.autodoc.co.uk
))
