On Saturday my car starting misfiring. As I came home it made a deep bang, started chucking out black smoke won't tick over has no power, won't go out of negative boost (though I'm guessing that's due to lack of power) and eventually cuts out. I managed to limp home off boost. Tonight I checked the plugs and everyone is completely black with soot. Any ideas on where and what to look at/for next.
All suggestions are greatly appreciated thanks.

 

Any of the boost pipes loose?

 

Not that are obvious ran out of time tonight though.
Cheers for the reply

 

Maybe a few details about your car fella

Model, year, mods?? Uprated anything?? May get you a few more answers people aint mind readers

 

Oh yeah, good point
Jdm 95 wrx fmic walbro 255 turbo back exhaust td05 hks mushroom 0.9 bar boost can't think of any thing else that might be relevant.

 

Could be maf

 

Car sounds like over fueling , have you had it remapped for the fmic?
If so , check air filter is flowing good
- poss 02 sensor , ecu may be goin crazy tho if you haven't mapped for your mods
/ but def sounds like

 

It could be 02 or maf related , i doubt it is a mapping issue for it to go instantly bad , + with the mods he's got And not mapped he would most probably be running lean not rich

 

Not been mapped yet. Has run fine with the mods for 6 months, does maybe 200 miles a month.

 

Oh yeah it has a z4 ecu fitted

 

^
Not if it was an ecu malfunction
Faulty injector
Best thing mate is to get it into ur local
ASAP

Regards

 

Cheers mate

 

My money's on maf or 02 fault

 

Ok thanks if it is that's going to be a diagnostic job, need to find someone to use. Any chance it could be turbo? It started to make a strange whine, but also wondered if that was just due to the rough running.

 

My money's just gone off maf /O2

 

You think it may be turbo? I keep remembering different things, sorry guys

 

First things first check all hoses / pipes for leaks , second unplug maf to see if there's any noticeable effect , if the car stalls the maf could be ok , but it's still no guarantee , then it would be 02
Then start looking at things like the turbo
If you can get it plugged in that would save you some hassle

 

have you checked intercooler pipes mate

 

No Ralph not yet as run out of time tonight.
Thanks Toneh given me lots to check and try tomorrow. One of my mates has also suggested the fuel pressure regulator so that's something to consider as well.

 

I know it sounds stupid and sure you would of checked to begin with but do you reckon there might be a leak in one of your hoses?

Crazy idea I know...forgive me but silly things happen!

 

Tomorrow it'll blow up with a comedy flash and #whooosh!# SFX...... And all that'll be left will be your pair of smoking shoes.

 

Cheers boys, turns out the dump valve delete bung came out! Fitted a temporary and the cars now running again thankfully.
Thanks for all the advice

 

Doh

I bet that bung is going to be done up super tight from now on

Glad you got it sorted mate

And that it didn't turn out to be a expensive one just before your wedding

we'll be seeing ya at the tunnel run then

 

Tell me about it, jus hope the lack of back pressure hasn't caused any lasting damage to the turbo. Can't wait for the run now, and so glad it wasn't expensive. Imagine explaining that just before the wedding.

 

If it is whining more now mate, I'd start searching for another td05 16g - I am sure there is one from a breakers on here at the mo for about £30....

 

It's the back pressure created by DV delete that is more likely to cause turbo damage!

JohnD

 

Glad you've found out the problem mate and that it was not a lot of ££££ to fix.

 

John it still has a dump valve in it but because its a pre facelift it doesn't go it the intercooler pipe work like on the later models, so that hole has to be blanked.
Adrian you won't believe how relieved I was when I found the problem, especially with the timing lol.
Yeah Adam someone in Chelmsford has a td05 so I may see if I can get it.

 

Ah....Fair enough.

JohnD