4evermad

iTrader: (1)

will this car ever run right i have missfire under 3000rpm over this it runs fine .
.its a my99 uk
.mods are hks dv apexi panel filter 05wrx intercooler .
.i have change plugs .maf .lamba .coil pack. knock sensor. cleaned boost sol.
.i have check all pipe work for leaks . .
when it missfires it feels like its firing on 3 not 4 or running out of petrol thats the best way i can explane it
any help please before i get the hammer out

New_scooby_04

iTrader: (4)

You've covered the most likely candidates.

If that's a VTA dump valve get rid of it and put the OE recicrulating one back on.

Get it to a specialist for a diagnostic test.

Ns04

STImulated

I know it might be stating the obvious, but have you checked the OBD? Other possibilties are cranksensor, fuel filter, or (hopefully not) ECU, best of luck....

Yamarashi

You mention a coil pack (singular) ... so if you do have the single coil pack have you tried changing the HT leads?

4evermad

iTrader: (1)

i have some ht leads on order the coil pack is the single one

4evermad

iTrader: (1)

with out sounding thick what is obd . fuel filter was changed last service, will look in to cranksensor but try leads first

Yamarashi

On Board Diagnostics ... when you connect the relevant wires up under the steering wheel and get a code read out of any recorde problems from sensors etc via the flashing engine light in the instrument cluster

Tidgy

mates has been doing exactly the same, have the timing checked

had slipped on his and was ideling/lower revs like a bag of spanners, but was better up rev range.

4evermad

iTrader: (1)

ideling is fine but if you hold the car at about 2500 to 3000rpm it splutters off boost this is

Tidgy

might be the timing then, worth getting it checked out, as said his was affected at ideling not higher revs so could imagine it could be affected at any rev amount

Optical Race

Got the same and have been pointed to the MAF meter. Going to try my Mates tomorrow. Will report back when I know whats going on.

4evermad

iTrader: (1)

no cel lights all fine there no codes

Sc0oby

try borrowing from some a fuel pump. As car ages so do the pump and losses some pressure.

4evermad

iTrader: (1)

im going to wait on the leads as when it is damp its worse but i will report back as most treads never tell everyone what was wrong in the end cheers

Optical Race

Swapped the MAF today for the one in my mates My99 and it sorted the running problems and totally got rid of the flatspot. So it seems that this could also be your problem..

4evermad

iTrader: (1)

changed the maf less than 100 miles ago, i hope it still ok . but cheers 4 your help and i hope you have more luck than me

New_scooby_04

iTrader: (4)

Wasn't a second hand one was it? Was there any improvement after you swapped it for any length of time?

Still say you should get shot of the VTA dump valve.

Ns04

4evermad

iTrader: (1)

no i got a new maf from subaru, as for the VTA i will have to try one off a 05 due to the wrx intercooler
cheers

4evermad

iTrader: (1)

oh and this seems to be more when the car has warmed up, ie like after boost then it starts to loss power between 2000 -3000rpm but after this seems ok

4evermad

iTrader: (1)

ok this is how my luck is going leads turned up , wrong ones to short if it wasnt for bad luck i dont think i would have any. bugger!!!!!!!!!

Yamarashi

Go and try this ..... it might cheer you up (well hopefully). Find a dark place (as pitch black as you can get it) and look at the HT leads and coil while the engine is running. You might see some sparks jumping to earth at the coil bracket area this indicates the place the faulty lead(s) is plugged in. You might also see glowing areas within the faulty lead where the HT voltage is jumping across the failing conductor.

Then if you do see a faulty lead hopefully one of the ones you have been supplied might be long enough to try out.

Let us know how you get on with your luck.

4evermad

iTrader: (1)

leads turned up ........ still got problem waiting on fuel pump will let you know how i get on

Yamarashi

Has someone suggested the fuel pump then?

I would have thought if it was the fuel pump, it would struggle when over 3000rpm not below it.

On the fuel side of things have you had the fuel filter changed recently?

and maybe try another set of plugs.

Tissy

Someone mentioned OBD ! This is an excellent tool for fault finding / CEL (Check Engine Light) code viewing / clearance etc. Plus it allows full data view of most engine sensor components etc. I recently organised a GB over at the ESC.

I will be getting some more devices very soon.

To have a look at the capabilities of this equipment, have a look at https://www.scoobynet.com/essex-scoo...good-tool.html if you wanted be included in the next batch.

Regards,

Steve

4evermad

iTrader: (1)

new leads are on but still the same prob if not worse the power serges untill boost comes on then all is fine im now stumped

DannyBoy007

iTrader: (7)

You really should take it somewhere to be looked at, At this rate you would of rebuilt the damn thing!!!!

4evermad

iTrader: (1)

i think you are right i do like to do things myself but i think this one has got me

DannyBoy007

iTrader: (7)

I'm a firm beleiver in trying to sort thing out yourself but in this case I think you well and truly beaten.

The worse thing is, I bet they find the problem in a couple of minutes and it's something simple

funkyspider

Are you close enough Zak at Mocom racing.. he's gettin quite a reputation as a fault finder so I believe (not been myself)

https://www.scoobynet.com/dealer-thi...ead-learn.html

4evermad

iTrader: (1)

one subaru fixed and running spot on big thanks to phil at subaru canterbury i did have a new lambda fitted two months ago, but it was a universal one and yes it had failed . a new one at a cost of 132 with vat and yippy it flys again. I would like to thank all that tryed to help . im happy again and can now put the hammer away untill next time