GU not revving/stalling

[Dpotts]

Hey everyone I recently bought a 2004 y61 4.8l with roughly 123km on the clock. The guy I got it off told me about the issue but I thought I'd take a risk and buy it anyway. Occasionally it will lack power and when it does this if you touch the throttle it just wants to stall. I have replaced the fuel filter and no success. I can hear the fuel pump working fine. It has a new throttle body + MAF sensor. New spark plugs also. It really has me stumped, Im kind of leaning towards 02 sensors but not 100% sure. Any help would be much appreciated!!

[threedogs]

Maybe take it to Super Cheap and get them to check if any codes come up.
Are there any small in line filters??

[Dpotts]

I've checked for codes and nothing

[Dpotts]

No inline filters I can see but haven't had a good look yet. I'll check it out

[the evil twin]

I've not owned one, only driven fleet 4.8's and they were awesome on the long trips

Be suprised if it is a mechanical issue, just about guarantee it will be a dodgy sensor or ECU input.
4.8's are esp prone to faulty 02 sensors causing grief, not sure about the throttle inputs etc.

[mudski]

Not much help here, but I had a chap come over in a black 4.8 with the exact same issue. Just bought it too... We tried a new MAF and it was a no go. I always wondered if he had found the issue....

[Clunk]

Did these come under the TPS recall?

[BigRAWesty]

Did these come under the TPS recall?
Was just going to suggest that.

[Dpotts]

TPS recall? Not sure, would it have been replaced with the new throttle body? Or is it a reprogramme of some sort? It hasn't played up in a few days now. Intermittent problems are such a pain to fix!

[Stropp]

Mate try disconnecting the battery overnight, this will reset the ecu that may help.

[Dpotts]

I'll give it a go tonight and let you know how I get on, although it hasn't played up in a few days so will be hard to tell. Cheers though!