This is my first post and I am a real novice when it comes to mechanics/cars, so please bear with me
I have a 1999 156 2.4 JTD. Several months ago the turbo seemed to almost stop working and the car obviously became sluggish, i.e. no turbo boost, and acceleration in general became very sluggish.
After taking it to my local mechanicm who did a diagnostic check etc, found nothing wrong with the turbo, and he couldn't pinpoint the problem. He actually thought it was the EGR valve (which I replaced with a new one) only to find it didnt solve the problem!!
So, I decided to take the car elsewhere (this time to a specialist turbo/car tuning garage).. The guy took the car for a drive and instantly said the turbo is fine and it appears to be an Air Flow Meter problem. He took off and cleaned the AFM, but only a slight improvement was noticeable. So, the mechanic said it was definitely the AFM and that he would order me one in. In the meantime, for some reason, he had disconnected the air filter. On my way home, I noticed a vast improvement in performance, with acceleration and the turbo kicking back into life. I got a replacement AFM (second hand) and replaced the existing one, and reconnected the air filter, only for the performance to become sluggish once more
. If I disconnect the air filter again, I get my good performance back.
OK, my question is, does the problem appear to be the need for a replacement AFM (bearing in mind I tried a second hand one - which may/may not be faulty) or is it an air filter problem (since performance improves when I disconnect it). Or could it be a combination of both?
Many thanks in advance.