Running Lean 205 GTI S3 engine
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  1. #1
    Fellow Frogger! Aprilia's Avatar
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    Default Running Lean 205 GTI S3 engine

    Hello all
    I just decided to change the plugs and noticed they looked very white, are there any adjustments to richen mixture on these injected engines? or is it an indication of a sensor not working? also is it bad for the engine running this lean, most of my driving is country hwy.
    Any ideas much appreciated.
    Thanks Doug
    plugs are NGK BKR5E gapped at .95mm

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  2. #2
    1000+ Posts PeterT's Avatar
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    The Motronic 1.3 management on your car is very dependent on the lambda sensor. If it wasn't working you'd be getting K light faults and the car would be unbearable to drive. It runs at 14.7:1 99% of the time.

    '92 205 Mi16
    '90 Mi16x4

  3. #3
    Fellow Frogger! Aprilia's Avatar
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    Hello Peter
    the car seems to have very good acceleration, a little bit of a stumble sometimes in low rpm, very smooth on the fwy, sits on 2600rpm at 100km but likes to creep up to 3000rpm if I'm not paying attention, starts easily but idle is somtimes not so smooth after driving for a while.

  4. #4
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    Default Reading plugs !!!

    Hi
    Forget all that old stuff about reading the plugs, for road engines. If they look any different from that, then there may be a problem. As Peter said the engine runs at around 14.7 afr most of the time and is designed to burn EVERYTHING and leave nothing behind to get on the plugs. That's the modern way to low emissions and easy breathing.

    There are no adjustments so people cannot make it work badly by playing, if its working as it should. Try a new oxygen sensor, because they degrade, if you wish to pick it up a bit, and an injector clean and check along with your spark tune up. But basically it checks itself and reports with a light if it sees a fault, as Peter says. What's a tune up on a modern car ???

    jaahn

  5. #5
    Fellow Frogger! Aprilia's Avatar
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    Sounds like a pretty efficient system, nothing to play with just enjoy the drive.
    Thanks Doug

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