Help! I am at my wits end. Since replacing both cats of my 156 (cf3) as both had broken up (possible missfirefrom washing engine off - don't drive with a missfire
) and both front lambda sensors (gone) I had had this rasping rattle, but only when the engine is under load/acceleration.
Does not do it on idle or light throttle, or over-run when changing down, only when open throttle accelrating or high speed - under load in other words.
I have had the front cat replaced twice (it sounds like its coming from the flexi there - but that seems ok, no leaks) with type approved cat, first Timax then another type approved brand - though clearly made in the same factory). It is still there the same.
I have spent hours under the car, checking, tightening, removing and replacing the cat, re-sealing it. Nothing seems to make it better! It is not the cat bracket, thats fine. I am at a total loss
I have just ordered the check lambda (though Regal said that was ok) and new plugs just in case, as it seems linked to shoving fuel in (open throttle).
Could it be the coil packs? These had tiny hairline micro cracks in I sealed with super glue.
Please help - I am at the point of chucking in the alfa towel. I have spent nearly £1k recently on a car that's worth £1.5k!
Also fuel economy not that hot around town - good on a long cruise though.
Hold the rear end slide....don't run wide!
156 2.0TS Veloce Lthr (02/02), silver, black Momo, BMC filter,V6 intake, DS2500 Front-DS Perf Rear pads, Conti sportcontacts, OMP strut Brace
Built in Italy, on the last Friday before (hic) Xmas........:-/