ABF 16v will not rev above about 5k after being sat for a few months

[Adezmk3]

Hi,

Unfortunately I'm not able to get the fault codes read. I've not had a chance to check if the timing belt has moved but I am pretty sure it hasn't. The car was parked up for about 2-3 months unstarted. In that time the ISV did get stuck so it wouldn't idle (this I have now freed up). Before it was left it definitely would rev cleanly to the red line (this I am 100% certain of) so I am more inclined believe its a dodgy sensor somewhere.

The fuel pump and ECU relays had recently been replaced, the crank position sensor, cambelt, waterpump, ECU coolant temp sensor, breather hoses, plugs etc and the car ran perfectly fine after this.

Any other ideas? It's not really 5k, its about 4.5k that it starts to struggle.

If anybody in the Hinckley area has vagcom and they could scan for me that would be great. I have tonnes of mk3 spares (currently have 5 mk3s to my name plus loads of bits and bobs from a few I have broken so would happily trade scanning for some parts).

cheers

[danmusic24]

Same prob years ago take the battery off and fully charge it.
Might sound odd but worked for me

[xAntiVenxm]

leaving this key popping aside..

i'd do what makes sense to me and thats scan it with vag-com. see what error codes pop up.

sounds like it's your hall sensor.

if you check the mk3 maintenance common issues thread there's a section on this.

[Adezmk3]

Which hall sensor do you suspect? The only one I am aware of on the ABF is the crank position sensor.

Thanks

[xAntiVenxm]

Which hall sensor do you suspect? The only one I am aware of on the ABF is the crank position sensor.

Thanks

look in the mk3 maintenance section, there's a list of the common problems. It shows the hall sensor in a similar area as the crank angle sensor, but not the same thing (i think)

[xAntiVenxm]

you also need to have the cam belt inspected.. if it's even one tooth out, the engine goes into safe mode and won't let you rev high.