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stp

  1. ringway

    EML after using STP Complete Fuel System Cleaner.

    Hi Chaps. I had the engine management light on my E430 and needed a new Lambda Sensor. Had that fitted and all was ok apart from a minor misfire at idle. A week later I added some STP Complete Fuel System Cleaner and the misfire has diminished but now the EML is back. Could the STP be...
    • ringway
    • Thread
    • cleaner complete eml fuel stp
    • Replies: 2
    • Forum: Engine
  2. A

    STP Fuel Injector Cleaner

    I saw a thread on this a while ago and i thought i'd give it a go to see if it did anything and i'm astonished. The Lean codes that i had have now both disappeared and the car is returning more miles to the tank than it ever has. On super unleaded from shell (i'll upload the pic when i get...
    • Adam230K
    • Thread
    • cleaner fuel injector stp
    • Replies: 22
    • Forum: Engine
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