hi all
the rattling exhuast on the st170 is a fairly common problem i gather, usually caused ny the heat sheald around the CAT corroding and coming loose.
my st170 had the same problem and when i searched various sites the best way to cure this was to either remove the sheilds all together or secure them with a stainless steel cable tie.
i tried the cable tie method but still the annoying rattle at just under 2000rpm!
i then investgated further and just after the CAT the exhaust goes back up towards the floor pannel of the car. it was here i noticed a joint in the exhaust which was loose, caused by a bolt missing! i replaced the bolt and now i seemed to have solved the problem!
hope this may help someone with same problem!
cheers

 

i know the one, connects a bracet to the engine, i found one loose and one missing ha, de catted now anyhow.

 

Same happened on my old 170, heatshields and CAT were shot, luckily still had warranty so all got sorted. They run the exhaust too close to the body 100%, does get annoying...

 

Got a rattle on the wifes ST170, will check it out, thanks

 

cats are 900 quid from ford as well

 

There is a bracket which secures the piece of exhaust prior to the CAT to the bodywork (or some other part). This fractured on my old ST170 which meant I had a buzzing around 1500-2000rpm.

It wasn't that expensive to buy, but a bit of a pain to replace because of tight access.

 

wonder if this is the same horrible rattle I get on my 2.0 Zetec Focus?

Dosnt do it when the engines cold but does it up to around 2k rpm once warmed up, epsecially when booting it or labouring the engine a bit.

 

My friend has the exact same thing on his 1.6 focus, same rpm too

He said he's been underneath it, and gets someone to rev it so it rattles, but can't find where its coming from!

 

Its doing my nut as it sounds bloody terrible, especially as im thinking of selling the car and as soon as someone hears the noise they will be put right off!

 

Good call have had the same prob bought a 170 3 weeks ago and was told it was a sheild but then thought it was the cat was just getting funds together when saw you thread went to kwik fit 2day and was the same bracket 38 buck from arnold clark ford about died but better than getting a cat so thanks

 

guys does the bracket have a part number?


and I take it the one you have to really go under the car, reach up and find ?


I think mine has sheared , I've placed a washer on one bolt to hold it all together and the rattle has stopped but I'd rather replace the bracket.


cheers in advance.

 

Happened to my mates st I took it off I heat wrapped it

 

how difficult was it to get off?

 

Few grazed knuckles but nothing serious

 

Depends how rusty the bolts are. While you have the cat off, if your sump is rusty stick a new one on before it starts leaking