zxrlocost
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| posted on 5/2/07 at 12:07 PM |
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1.8vvc failed MOT emissions
hi failed my MOT on my 25 gti
emissions were ridiculous
co should be 0.30%
both times was above 4.2
HC was 279
and lamda was 0.87 which is below the 0.97-1.030
CO at idle was 3.25 should be below 0.5
any ideas the car seems to run fine
fan hardly ever comes on etcetc
ta chris
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PeterW
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| posted on 5/2/07 at 12:13 PM |
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Chris
Find your local Forte stockist and get a bottle of the injectpr cleaner, and give the car a good italian tune-up.
Dodgy lambda sensor can sometime screw the mixture up.
Peter
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macnab
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| posted on 5/2/07 at 12:14 PM |
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cat not working??
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britishtrident
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| posted on 5/2/07 at 12:46 PM |
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First thing to do is check if the lambda sensor is "switching" voltage ie going up and down the voltage scale rapidly, if it isn't
the engine is running open loop.
With the MEMS and most other modern system if any of the senors don't pass a "sanity" at the warm up phase the system use default
settings or runs open loop. So do a quick check that all the connectors are making good contact. With a DMM check the coolant temperature sensor and
inlet air temperature sensor are giving corrdect readings and that the throttle pot is giving a nice smooth output as the butterfly is moved.
Usual Rover other things to check are if the MEMS unit earth wire has a good earth (on the 25 I think it is earth on the bonnet landing panel as it
was on the 200), this usually means fitting a new bolt and star washer -- this is well known Rover problem.
Also check that the MEMS unit plug(s) are fully home and if the MAP sensor is fitted to the ECU (this is the case with early MEMS types but not the
very last version which have a combined MAP and IAT on top of the manifold) carefully blow through the connecting tube between he manifold and ecu
***carefully disconnect at both ends first***
Blockage of this small bore pipe is a well known Rover glitch.
[Edited on 5/2/07 by britishtrident]
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wilkingj
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| posted on 5/2/07 at 06:15 PM |
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Ahh... its dead easy to solve...
Get a "Q" Plate 
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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