help needed please

[LAZLO]

i got a version 3 sti and its doing my head in lol has a miss / choke and it just loses power,starts off driving ok,but about 400meters later it starts cutting and choking again,ive changed spark plugs,coil pack,leads,air flow meter,fuel filter,fuel pump and put in more gas,gonna try ecu next but thought id ask here in the meantime,check engine light doesnt come on so i dont know whats up with it

[Pappu1]

what mods done to it?

[LAZLO]

nothing pretty much,just the usuals 6s ecu,orange afm,yellow injectors,blow valve,external wastegate,fuel pressure regulator but no gauge

[LAZLO]

sup bro,yeah sweet will check those out

[Pappu1]

is the FPR playing up perhaps?

another fpr to test out....?

[LAZLO]

yeah i dont know how to check it,it came with the car lol

[Pappu1]

maybe replace with another and then try

kingpin has one from what i been told

[666SubSpeed]

Also check the temp sensor as it could be the auto choke playing up if it only happens after starting up. could be giving the ecu a bung reading causing the ecu to run like its warmed up when it is still cold.

[LAZLO]

Sweet will try them tomorrow,thanks

[reaperblitz]

Worst case scenario- borrow someone's working purple afm and wrx ecu and run it on a 'limp mode' till you figure out what it is.

It could be the ecu and afm combo etc

[Pappu1]

 reaperblitz said:

Worst case scenario- borrow someone's working purple afm and wrx ecu and run it on a 'limp mode' till you figure out what it is.

It could be the ecu and afm combo etc

will the purple afm and ecu run yellow injectors tho?

have u checked for codes at all?

maybe check and reset first....

[QIKSTI]

I had a similar issue with my sti type r, ended up being a combination of a hole in the under manifold intake and a bung fuel pump so upgraded pump to Walbro, new silicone intake and bam purred like a kitten. Previous signs I had was the jerking and missing when driving idled fine cold or warm

[QIKSTI]

Oh also done the check for codes and then reset the ecu was like driving a brand new car after that

[LAZLO]

My external has a gasket leak,no check engine codes coming up,how do you check for them otherwise?

[reaperblitz]

Yes purple afm and ecu run yellows with no problems. Hopefully it isn't to do with a pod filter stopping air flow readings

[LAZLO]

Even with pod off CEL still doesnt come on

[Pappu1]

there is a thread here that shows how to check for stored codes and reset

oh and does the car die after 400m or still runs but really rough?

can u smell petrol out the exhaust (maybe get someone to drive and u snif lol

[LAZLO]

Still drives all the way just feels like no powerwhen u put your foot down,it just chokes,

[Pappu1]

are the coils ok

are the leads ok

how is the sparks

is it over fueling (cheap reg can cause issues)

how is fuel filter

fuel pump condition

maybe check the basics first

[LAZLO]

Ive done all those things except the fuel reg,changed the plugs,afm,coil pack,leads,fuel filter,fuel pump but not the fuel reg

[Pappu1]

Give it a Swp and test it bro

43.5 base pressure and see how u go

[RA_Jay]

any luck lazlo? mine is having the exact same problem :-\

[LAZLO]

Havnt had time to do it,busy all yesterday with my daughter,but ill have a look tomorrow.

[RA_Jay]

got mine sorted today ;D, i cleaned up my MAP sensor, sprayed the hoses and inside the sensor itself and all the connections around that area with CRC. then i put the car into safe mode. (plugging the 2 connectors under the dash) took it for a drive and it had no codes. put some fresh gas in, unplugged the connectors and adjusted the idle control valve slightly. and she runs mint now.

yeah so maybe try a new MAP sensor, and taking it for a spin to make sure you have no codes.

cheers, Jay

[LAZLO]

Thanks Jay,might give that a go aswell,im not getting any codes at all,but hopefully if its sunny today I can try work on my car,i dont have a garage lol.