All Things Mk5 > How to Guides / Troubleshooting

power loss at 4000rpm

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muff1991:
its weird, because the VVT solenoid would throw the EML as open circuit, when it had disconnected/slipped off (obviously). but whether it was connected or not with the EML on as open circuit or not.. the car drove the same. the car even drove fine for months before with it like this, which is why I kind of ruled this sensor/solenoid out when the problem started.

But I defo think, a mixture of that new sensor (think its the N205 for anyone who doesn't know what I'm referring to) plus its new firm connection and the ECU reset (battery disconnected for a few hours) has certainly done the trick! But like I said i will tell better if its solid when I drive it next with the outside temps being mild ish (under 10) as it was intermittent and im sure outside temp may have had something to do with it. But it got to the point it become more constant problem.. it was so bad! I even got a mate to film holding a boost gauge and you could literally see the boost needle drop then bounce around ( up and down, like an N75 issue) but replaced that to find nooo difference!

Measuring the MAF is something I want to do as well.. I read it should be around 10g/s when holding the revs at 3000rpm.. not sure if this is stationary or driving though?

funny you mention fuel pump too, as back in the summer last year (when all was running great) I heard a small whining coming from the pump, only when I was sat in neutral in the traffic, I was leaning over the seat and could defo hear it was the pump. But the second I revved it would disappear, it only done it a couple of times, and haven't heard it since! so maybe an underlying issue with that too! possibly something to do with the cold start issues lol

maybe related too.. so last of all.. in the summer my drivers door wouldn't unlock every time, it was playing up! to the point I would have to use the key to unlock it.. put this down to the locking mechanism thing, but then all of a sudden after a few months.. it started working again.. and still working fine now! wtf lol

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