I know a lot of people will immediately say waste of time, take it off, etc, but I havent had chance to properly test it yet, though fuel consumption does seem a kit better round town.
Anyway. my car has started hunting quite badly on idle after fitting this. The hunting only really occurs when the car is up to fully operational tempertaure, prior to this its ok.
It doesn't hunt so bad that the revs drop that much causing it to stall, but it is very noticeable, and does come close on some occasions.
Any help/advice appreciated.
Karl.
Mark3 1.3 SPi Hunting on idle after fitting Ecotek
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Karl_CLCoupe
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genesisGT
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Hi mate,
Not had an experience with the ecoteck valve but the hunting is usually down to a number of things:
to week or rich mixture, (you said you were getting better mpg indicating to week)
revs to low at tick over,
leak in manifold/throttle body gaskets - weakening the mixture,
or poor ignition timing.
If the polo ran fine before, the valve must be wrongly regulating the airflow making the mixture funny.
Is the valve universal or does the air have to flow through it one way?
Is it in the right location? (I know your NOT duu!!) but if i remember it says fit the valve so far from something! might be worth buying a big bit of tube and trying different lengths to see if it affects it!#
the valves purpose is to "fule" (spelt wrong) the system into thinking there is a different mixture /flow than their actually is therefore it ajusts and is ment to make it go better i think.
sorry cant be of more help!
just try winding it all ways and going a run till it improves!
Not had an experience with the ecoteck valve but the hunting is usually down to a number of things:
to week or rich mixture, (you said you were getting better mpg indicating to week)
revs to low at tick over,
leak in manifold/throttle body gaskets - weakening the mixture,
or poor ignition timing.
If the polo ran fine before, the valve must be wrongly regulating the airflow making the mixture funny.
Is the valve universal or does the air have to flow through it one way?
Is it in the right location? (I know your NOT duu!!) but if i remember it says fit the valve so far from something! might be worth buying a big bit of tube and trying different lengths to see if it affects it!#
the valves purpose is to "fule" (spelt wrong) the system into thinking there is a different mixture /flow than their actually is therefore it ajusts and is ment to make it go better i think.
sorry cant be of more help!
just try winding it all ways and going a run till it improves!
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Karl_CLCoupe
- Platinum Member
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Well, the valves located 3 inches from the inlet manifold, as per instructions, and the article on polo-gt.co.uk.
The vlave is univerasl for all cars, and I have once again followed the instructions, locating it on the correct side of the one way valve on the vacuum hose.
Its been tuned up as per instructions too, until it makes that hideous sucking noise on trottle, and ceases on release of throttle.
Maybe these old cars object to them
, especially mine, its incredibly fussy being a late spec Mark3.
Guess I will have to reset the ECU, and let it sort itself out...
Thanks for your help.
Karl.
The vlave is univerasl for all cars, and I have once again followed the instructions, locating it on the correct side of the one way valve on the vacuum hose.
Its been tuned up as per instructions too, until it makes that hideous sucking noise on trottle, and ceases on release of throttle.
Maybe these old cars object to them
, especially mine, its incredibly fussy being a late spec Mark3.Guess I will have to reset the ECU, and let it sort itself out...
Thanks for your help.
Karl.
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amstrange1
- Silver Member
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- Location: Leamington Spa
My hypothesis:
The early AAV management ran primarily from the throttle position switch input, so assuming yours is the same could be the reason for the hunting at idle. The leak-o-tek will be letting in extra air at idle that the ECU in effect knows nothing about, thus leaning out the mixture. The ECU will then be doing its best to stabilise the idle, but not getting it quite right as its base map will have been coded for less air entering the inlet manifold at idle.
Persevere for another week or so to see if the ECU can learn to cope with the extra air, as it might settle down. Personally I only ever saw a benefit from my leak-o-tek on my old AAV/3F hybrid motor that wasn't setup correctly. On Yoof's GT it made bugger all difference, but then the Digifant MPI system is pretty efficient to start with.
I'm not a fan of the valve anyway, it only has an effect at idle and part throttle cruising - at which point the lambda signal is controlling the mixture anyway, so if the sensor's healthy the economy should be pretty much optimal. The valve will just lean things out a little, which might give slight economy gains - but then VW would've decided upon a specific target air/fuel ratio for cruise/idle which the valve is altering. Maybe it's fine to use, as obviously VW will have built in some safety margin when choosing the target air/fuel ratio, but I'm not convinced.
The early AAV management ran primarily from the throttle position switch input, so assuming yours is the same could be the reason for the hunting at idle. The leak-o-tek will be letting in extra air at idle that the ECU in effect knows nothing about, thus leaning out the mixture. The ECU will then be doing its best to stabilise the idle, but not getting it quite right as its base map will have been coded for less air entering the inlet manifold at idle.
Persevere for another week or so to see if the ECU can learn to cope with the extra air, as it might settle down. Personally I only ever saw a benefit from my leak-o-tek on my old AAV/3F hybrid motor that wasn't setup correctly. On Yoof's GT it made bugger all difference, but then the Digifant MPI system is pretty efficient to start with.
I'm not a fan of the valve anyway, it only has an effect at idle and part throttle cruising - at which point the lambda signal is controlling the mixture anyway, so if the sensor's healthy the economy should be pretty much optimal. The valve will just lean things out a little, which might give slight economy gains - but then VW would've decided upon a specific target air/fuel ratio for cruise/idle which the valve is altering. Maybe it's fine to use, as obviously VW will have built in some safety margin when choosing the target air/fuel ratio, but I'm not convinced.
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Karl_CLCoupe
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