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Car is a Mk1 Golf Cabriolet with JH1 injected engine.

The car struggles to catch when the engine is warm. It turns over easily but will start to fire on only 1 or 2 cylinders for a while before catching on all 4. When cold, there is no problem - it starts normally. When running, either hot or cold, the car drives normally.

I have replaced the plugs, leads and battery, but no change. I have also replaced the fuel filter, thinking there was a blockage, but again no change.

The distributor cap and rotor seem a little worn and there is carbon deposits that I scrape off sometimes. Could that be a cause?

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  • Does the engine run rough when warm, or do you have any performance problems?
    – GdD
    Commented Aug 12, 2019 at 7:09
  • No, once running engine seems smooth. However, it does feel a little down on power when warm. I think it may need timing adjusted.
    – MeltingDog
    Commented Aug 12, 2019 at 23:13

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Found that for whatever reason ensuring the lifter pump seal was properly fitted fixed this. I ended up using aviation gasket sealant along with the O ring.

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