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Help - S3 random surging no fault codes

Discussion in 'A3/S3 Forum (8L Chassis)' started by Gordie_S3, Mar 30, 2013.

  1. Gordie_S3
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    Gordie_S3 Member

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    Hey guys,

    I recently scanned my S3 and found that the pre-cat oxygen sensor was faulty and I replaced it with a new one. Shortly after replacing it iv noticed my s3 would 'surge' or cut out randomly through out the revs while driving.

    No fault codes either when I scan it.

    Could it be something with the fuel? Fuel filter....fuel pump...injectors?

    Thanks in advanced guys!

    (Details of car: AMK, V3 CAI Badger5, N249 bypass, Forge splitter)

    G
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  2. s3dave
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    s3dave TFSI Hybrid

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    Check your Fuel pressure reg for a blockage...
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  3. Gordie_S3
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    Gordie_S3 Member

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    Put a new one in, its a bit better but the surge cut off still seems to be there. Its lacking on power aswell
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  4. Gordie_S3
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    Gordie_S3 Member

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    So after a day of driving, no differences with new FPR.

    Symtoms are more like hiccups/ fuel cut when I put the throttle down. N75 valve? But it would throw a code if it was faulty?
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  5. Gordie_S3
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    Gordie_S3 Member

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    Went into this a little more as its gotten really annoying and I need to get it sorted before the tune...so I put a new fuel filter, re-tensioned knock sensors, new plugs, new MAF, checked boost leaks, couldn't see any vac leaks or hear, no bursts PCV pipes.

    Only fault codes that come up are..

    17524 - Oxygen (Lambda) sensor heating, b1 s1
    P1116 - 35-00 - open circuit
    17511 - Oxygen (Lambda) sensor heating, b1 s1
    P1103 - 25-00 Performance too low

    The replacement oxygen sensor I put in wasn't a Bosch unit and it was doing the same symtoms (hesitating, misfiring etc). I bought the exact Bosch replacement, but I have to wait for it till it comes from the states. Could it initially be this? It still throws readings threw logs.

    Ive done a few logs and the ecu isn't pulling any timing either...
    #5

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