Hi all ive just finished fiting all my new goodies ready for the remap and now it wont run properly,is realy lumpy idle and lots of back firing before it cuts out after 20 seconds.

Im running a td05 16g turbo, walbro fuel pump, sti9 tmic, full 3" systerm including decat, 440cc injectors.

is this normal ?

 

...no this is not Normal who fitted all the bits?

darc

 

fitting bigger injectors would be the cause surley!

I would of thought its now over fueling like mad... hence the backfiring and cutting out. Cant really be run with bigger injectors without a re-map so wait till the mapper arrives.

Gaz

 

the injectors are standard
will the mapper be able to sort this out

 

i fitted all the bits myself

 

Oh, I assumed seeing as you said you fitted 440's that they were bigger than the ones that were in there. What year car are we talking?

Gaz

 

is a 99 uk turbo
440s come standard with the year so ive been told it was ruinnig a tdo4 and the standard tmic before i swopped them.
it wouldnt start at all till i un plunged the maf.

 

Yea ok on a 1999 they are 440's... (or if the engine code is GC8F or GC8G) I guess you could have damaged the MAF arnt they very easy to damage on the 1999's... slightest knock kills them?

Whens it going to be mapped?

Gaz

 

The maf was playing up before and over fueling. i have a new one that i will try but could that be it or does it sound like something else could be wrong.
I was going to get it done in the next few weeks , would it need to be running or would the mapper be able to sort it.

 

ive been told that bigger injectors need a map but you should beable to drive the car off boost til you can get it maped fo a short period of time so dont think that would cause the problem.

so the car dident start atall b4???

 

fuel pump working properly? double check everything you have done before car started playing up it may just be something silly like not plugged a fuse back in or gone?

 

The fuel pump kicks in and presurises and the turbo has only just be rebuilt, theres no air leaks either

 

did you try the new MAF? just to eliminate the known things as you go along :P

 

double check for an air leak mate. had exactly the same symptoms when i upgraded intercooler. found a hose not seated right. doesnt matter about injectors or turbo, the car should still start and idle

 

I will try it tomorrow when im with the car.
Would the maf cause such harsh idle and back firing though?

 

idle yeah but never seen backfiring. thats what reminded the symptoms of mine. no throttle responce, had to keep foot down to keep barely running. pop bang bang cut out

 

Yeah sound just like it.
Where abouts were you losing air from mike81.

 

sound like air leak to me aswell make up some leak detection fluid (water and washing up liquid) squirt it all around the intercooler + connections and look for bubbles hope this helps mate

 

Cheers i will give it a try
Hope the intercooler isnt bust though, ive only just had it.

 

shud do a fault check aswell mate just to see if clear or some code pops up