Ben123

Hi All, wanted to get an opinion on my E60 525i. Recently bought and has been well cared for, but clearly has a problem with either the front cats or Vanos system. Initially the car bogs down under acceleration and frequently goes into limp home mode.. My mechanic has checked the Vanos system, replaced cam sensors and MAF.. which has had no bearing on the problem.. I have contacted the previous owner who has since told me that he had new plugs, 2 coils replaced and the vanos system serviced.. He said his mechanic had cleaned the cats out and was surprised that there was now a problem.. Skip forward a couple of weeks, the car is undrivable with the Vanos system connected and with it disconnected its just slow.. All the indicators are pointing to the clogged front cats, but can they really cause that much problem.. It idles fine but any sort of acceleration with the vanos connected it bogs down immediately. any thoughts?

Hi All, recently bought a e60 525I in what appears to be good condition.. However pretty immediately there seems to be a problem. The car bogs down under any sort of excelleration if under load.. Been to my garage who have checked the vanos system, MAF and sensors on the camshaft.. Thé belief is it's blocked front cats.. They have disconnected the vanos which allows it to run without faults although massively underpowered.. If i plug the vanos back in, it immediately faults and bogs down, even get some timing chain/valve noise around 3000rpm. Question is, does it sound like a cat problem or vanos related? The difference is quite dramatic, if unplugged it's slow, but plugged In its undrivable.. Shame as it's a nice car otherwise and at 110k miles should have plenty of life left In it.. Grateful for any suggestions.. Many thanks Ben