sitting in traffic yesterday and had to boot it to make it through the most stupidly fast changing traffic light, made it through but the car made a horrible shrill noise and start to idle erracticly, whilst doing that loads of black smoke started pouring out the back, would hardly drive at all under load and the only way to get it home was using 1000rpm idle and changing the gears!
got home and found the dumpvalve hose had blown off, so I reconnected it, this made the car drivable but its still idling all over the place and soot is pouring out the back making me think its running 100% rich.
If I boot it now it there is no boost and the car just burbles where the turbo used to kick in. there is no noticeable black smoke now but if you rev the car hard a little puff can be generated.

what do you guys think? have I blown the turbo (not the end of the world I wanted a new one anyway) or has the oxygen / lamda sensor gone. Or is it something much much worse

car is a moderately modded MY95

 

Option (a): You've lunched your motor.

Option (b): Horrible shrill noise is probably the sound of your turbo through the (now open) inlet tract (where your dump valve hose blew off), and the car's possibly in limp home mode. Put all the bits back together, do an ECU reset and see what happens.

BTW, booting a Scoob immediately after sitting in traffic is a bit of a no-no as the intercooler absorbs engine bay heat quite well and sends your on-boost intake temps a bit high if you don't let it cool first.

 

thanks, I didn't think about limp home mode good idea, I didn't get any CEL and whilst I'm prepared to accept the engine might be toast I just thought if I had the smoke would be constant? driving into work today was fine until (a little bit juddery but nothing awful) I requested any boost.

thanks for your reply

 

There has to be a leak somewhere after the turbo. Check for the hoses!

Mark.

 

how do I reset the ECU, is it just the black conenctors under the dash or do I need to remove the power?

 

Blacks and greens. Further info if required...

 

Hi All,

Sorry to hi-jack the post, but had the following comment after being spotted yesterday, and I'm slightly concerned.

" About 2:30 today - had a nice gentle play with the above. Thanks for the wave. BTW, nice and polite little flame and pop from the exhaust on the over-run, but quite a bit of soot under heavy acceleration. Nothing serious I hope......"

Background:
The car was used all morning before we stopped for about an hour, but then had been driving for around 15 minutes before being spotted and booting it (quite hard 6-7,000 revs) to get round some traffic!

Car has plenty of oil in, though could do with a service. Water and other things all fine, nearly a full tank of petrol was in the car (Optimax). Car is a 94WRX slightly modded but nothing major (quickshift, magnex de-catted exhaust, some air filter or other?) Car has just done 100,000 miles and runs pretty much like a dream most of the time. Doesn't like the damp but have put that down to needing to replace new sparkplugs and a service!

Any advice greatly received
Many thanks,
CHRIS.

 

right did that, got the code, saw why the boost was buggered (hose behind intercooler had blown off), sorted all that jobs a goodun but the code I was getting was

long long long long short short short short (from memory)

wastegate duty solenoid, what the hell is that? where is it? how much is it?

thanks for all your help so far

 

Not sure where it is on yours but on my my99 it's on the inside of the offside front wing. IYSWIM. Fault code was probably thrown up when the pipes came adrift so a reset should clear it.

One thought that springs to mind is why did your hoses let go? Do you monitor your boost pressure and was it normal at the time? If the hoses have been forced off by abnormal pressure you probably want to sort out why it's happening.

 

I have a blitz SBC ID3 and I did a play back from the time the "incident happened" and it never went over 1.08 (I have it limited to 1.1 even on scramble), the hose popped off thanks to a jubilee clip failing. Still no clearer to understanding quite what happened with all the black smoke etc.. after the reset and hose relocation it seems good as gold

*touches wood*

werid

 

The ECU would have been fuelling for what air had passed the MAF sensor, but if the main turbo to intercooler hose had blown off, none of the metered air would have made it as far as the intake manifold, so...

LOTS of fuel + not alot of air = lots of smoke.

 

as mentioned, black smoke from rich running due to pipe being off after the maf so ecu measured air, it then didn't reach engine however fuel for air added anyway .... iyswim, cel code means that the ecu tried to ramp boost and hit the limit of the boost solenoid duty therefore flagged it as a problem

bob