2 T4s and not a clue

[DunnT4]

Hi, I currently own a 2002 V40 T4 automatic and awaiting delivery of a 2004 S40 t4 Manual. The V40 I bought back in October with 108k on the clock and up until the guy before me got his hands on it, it had been very very well kept by its previous owner of 17 years with full services every 6 months with alot spent replacing just about everything. The only thing that has never been touched is the turbo which brings me to my problem. In the last month or so its developed a noise which doesn't resemble any sounds nor any symptoms of a blown/faulty turbo that I know of. Now I will say I'm no mechanic and after 10 years of being in the RAF and having not much interest in cars I am fairly new but not un-teachable, so by all means it could possibly be a faulty turbo i don't know hence why I'm here and since all my mates have no interest in "boring rustbuckets" i'm on my own. The best I can describe the noise is when you hit around 3000rpm a "stuttered induction" sound happens. No whining, whistling, crunching or any smoke at all and it still pulls very well, even being still good for 140. Now the guy who owned the car briefly between the careful owner and me looked like he had been through a few bushes and ditches in it with all the scuffs and scrapes so I do know it has been abused for 6 months covering nearly a 1000 miles a week for the entirety he owned it, but even with that said it has been spot on up until recently. And then today a new one! When i pulled in from work, as soon as I engage park the engine started revving without revvkngbif that makes sense? I engaged drive and then back to park and it was fine? Sorry for the life story but yeah any experienced opinions would definitely be appreciated and anything to watch out for regarding automatics or the s40s would be appreciated also.

Cheers

Callum

[qscgyjl]

Check for air/vacuum leaks, the 3k sound is possibly related. Are you replacing the V40 with the S40?

Mike

[DunnT4]

Nice one I'll have a check when I go back over the unit Monday. I had a quick check last week but I was in a rush and with not that much knowledge i spent most of my time educating myself on it rather than diagnosing much, and no not replacing the v40. The V40 is my Mrs' and now its off the road to be freshened up a bit she'll be using the S40 for the time being and then it'd be a case of deciding the S40s future.


Callum

[sortedt4]

i would cheek the one way valves from the fuel tank vapor system.. one faces inlet manifold and other on goes in before the maf....they are on a t pipe coming up by side of the battery...

[DunnT4]

Nice one I'll have a look into that too.

[Baffler]

Hmm....is it possible the previous owner had a manual boost controller fitted? As said check all the vacuum hoses, their condition and connections.