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VW BORA 2,0 85 KW - petrol engine 2002 year

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6 years 10 months ago - 6 years 10 months ago #34466 by Micha
Have hard start, have this problem for more than 1 year.

1 year ago = I had to start my car 2-3 times (car started also on 1st time, but immediately died, then on second or third time it was "ok" and car stays running).

half year ago = (whole winter) car didnt need 2-3 starts, car running after first start whole winter (when outside cold it was ok, when outside more than 10 degrees C, needed 2-3 starts)

Now its even worse, I changed MAF sensor and also crankshaft position sensor and its even worse, on first try car just cranks, nothing more happens, sometimes I need 5 tries. if car sits for long time (3 days), it runs weird, erratic vibrations from engine, after I drive it its okay, in last months I feel more and more like car is weaker and weaker (like 50kw not 85 :D)

Have these codes:
i.imgur.com/JeUDnJB.png
i.imgur.com/jap8A8n.png

also after I changed mentioned parts car does this:
i.imgur.com/0xI1WLQ.mp4
tach needle bounces after I put key SECOND time to position, it also has sound effect when needle bounce (like click or maybe fuel pump prime sound)

I read lot of things on the internet and I really dont know what could be the issue, I dont want to change all parts that I think it could be like: ignition coil, spark plugs, fuel pump, sensor wirings, maybe bad ground of something.

EDIT: Tach needle bounce is related with fuel pump sound (I went to car and heard it from rear sit)
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Last edit: 6 years 10 months ago by Micha.

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6 years 10 months ago #34523 by Micha
any suggestions? please

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6 years 10 months ago #34593 by guafa
Hi micha,

That looks like a lack of fuel at starting.

Do you have a fuel pressure gauge?

The fact that at different temperatures engine start or not at the first try, is due to pcm injects different amounts of fuel.

Maybe fuel pressure is not enough at starting. You can check it by turning key on and off several times (while listening fuel pump working every time until you notice the change in fuel pump sound). Then cranking.

You can also spray a little fuel or starting fluid inside intake manifold, before cranking.

The fact that niddle is bouncing while pump is working, is pointing to an electrical issue. That could be a bad ground.

At the same time, a pump which is not working properly, can explain the lack of fuel.

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