turbo problems

hi there well i hve a stilo 1.9 jtd i took it to the dealer as i was having a problem with turbo .i could drive it around at normal speeds but soon as i drive it hard the tubo just shut off if i sloww down for a minute or so the turbo comes back 2 me but same happens when i accelerate hard again it seems 2 do it soon as it goes into 4th gear.the dealer says the turbo has gone it comes up as overboosting but after reading posts on hear im wondering if overboost valve .thic car has been completely submursed in water due 2 floods every thing else is fine just this problem do i change turbo or overboost please some1 save £750 as that wat dealers price 4 turbo

Hi, and welcome to the forum. Are you getting any hissing at all when you accelerate?

If so it may be the intercooler hose split, a fairly common and intermittent fault. Check the pipes to the overboost valve to see that they are ok and if possioble re-position the overboost valve higher up.

Check also the MAF sensor, give that a clean but it sounds like your dealer is going for gold and wants to rip you off.

Yes; these are absolutely classic symptoms of overboost valve problem.

As Bozzy says check all the tubing (to/from the overboost valve), clean it and as a last resort change it.

hi thanks lads there is a noise but i have checked the intercooler pipes as i had that problem on a punto im goner go 4 the over boost valve as cheeper option is it easy 2 change also does any 1 no a good breakers as im realy struggling 2 gt parts and ill need a new visa at fiat prices

When my car got stuck in the floods last year (thanks to a white van man ).

it had to be started by a rescue driver because it was just the battery that got swamped, luckily everything else worked.

i found that for about 30 miles after that i was driving around with no turbo assistance and an awful lot of smoke. as it was 8pm'ish and a sunday, there would be no local garages open so i had to make the journey home.

after about the 30 miles the car seemed to sort its self out and then suddenly picked up and went back to normal and the return to dealer light stopped.

Isnt there a recommendation to relocate the overboost valve from low down in the engine bay, to the battery tray to reduce its vulnerability to water damage? Am sure i read it somewhere. If the OPs car has the valve in the original place, this could be the prob maybe?

cheers lads u saved me a fortune the dealer wanted £750 i fixed it with a can of wd40 just took over boost valve of cleanded little filter with wd40 and jobs a gooden nice 1

Where is the filter in an overboost valve? I didn't know it had one.

It's open to the atmosphere (hence the filter) which also explains why it plays up when it gets a soaking