ka24de-t horrible idle.

[osirus74]

ok here is what im dealing with. 92 ka24de, BC 264 cams, t3o4e(t3/t4) turbo, emance ecu, stock mafs, jwt 370cc injectors, walbro 255lph fuel pump. this is the story, the car ran beautifuly before the turbo. after its installed it starts and smokes(rich) and loppes around 400-1000 rpms or it will just sit 350-500rpms. oh by the way the ecu throws a mafs code. wont rev past 2400 rpms and boggs out real bad and vacuum is at 10 when idleing. i put the new injectors the pump and the ecu in with a new mafs and it does the same crap except i can get it past 2400 rpms make 8 psi but it still pops a 12(mafs) and idles and revs up like crap. this is the confusing part, i put the stock ecu in and it starts up and idles like its cold because it is so its idleing and the sound changed to a much better sound and vacuum is 20 and 55(all clear)and it doesnt smoke nearly as bad but, if you give it gas because of the 370cc's it floods out and if you let it idle it will eventually flood. sorry for the long story but thats the problem i hope you guys can help me out since everyone else with bad idle doesnt seem to have it this bad.

Modified by osirus74 at 2:52 PM 8/7/2008

Modified by osirus74 at 8:57 PM 8/7/2008
Modified by osirus74 at 8:58 PM 8/7/2008

[osirus74]

Does anyone have any idea? or do i need to explain it differently?

[Roger_cha]

well if all that tuning did you take it to the shop to get it tune... if not then that might be ur problem... cause maybe the ecu cant read the mafs and try upgrading it too see if that makes a different... as for the stock ecu that you try of course its going to flood cause the ecu cant read the 370cc injectors...

[osirus74]

yea except the ecu is tuned to 370cc injectors STOCK MAFS, and the turbo, and cams. so it should run fine. emphasis on "should"

[osirus74]

oh adn thanks for letting me know that the 370cc would flood my car out with the stock ecu i didnt post that already!

[osirus74]

vented to atmosphere.

[osirus74]

do i need to plug egr and bpt? a friend said thats whats wrong. any clues?

[sideways13]

i have about the same problem, any one help? it doesnt want to turn over at times and is very hard to start. i changed my spark plugs acouple days ago then i didnt drive it for like 2 days now it runs really bad

[osirus74]

well im going back to stock injectors today to see if its the emance ecu thats not working properly. ill let you guys know what up.

[osirus74]

well that had no effect. the stock ecu and injectors had no affect. it still stalled. found 2 bad injector orings, replaced them and not much of a difference. got colder plugs and it improved vacuum a bit went from 10-15 but it didnt last long before it went back to 10. it only took about 10 min of idle before it went to 10 vacuum. i tested mafs harnes and its bad, repaired it and still nothing. now i have a metalic click that happens at the exact same time spark happpens in the fourth cylinder. goes away when you unplug injector harness on both aftermarket and stock injector. im running out of ideas. going to triple check all intake piping tomorow. please if anyone has any clue id like to know. oh but the idle has gotten better its around 600-750 but it lopes from 600-750. still smokes and still rough while it races through rpms(boggs down)

[osirus74]

ok i think i found the problem. im an idiot. so i went to do a compression test and i unpluged the fuel pump fuse to run it dry as soon as i started it it was perfect, 20 vacuum, idle was smooth(and normal) as soon as i touched the fuse back it stalled. i got it running again with the fuse in and it runs like crap. compression was good overall. 150,155,153,150.now my next question is what kinda test do i run to test why im getting too much fuel? or should i just buy an aftermarket FPR and be done with it? 255lph pump,370 injectors and tuned ecu. ka24det

[osirus74]

Well i have made alot more progress. ECU was bad. i just got the new one (thanks jason for working with me) and i found my injector orings to be bad. i got the o-rings replaced and the new ecu in and Blamo... it started and sounded correct until it started missing and stalled about 4-5 seconds later. it wont respond to throttle much at all like maybe 1/8th on the pedal before it bogs out and stalls. its not smoking at all and I just checked fuel pressure(47 when priming, 41 once it stops, 38 at idle then it stalls.) one wierd note, i took off the filter and i can keep the car idleing at 750-800 while keeping my hand in front of the intake(without filter) but i only have to cover the side where the sensor is located(mafs). but you cant really give it much gas either or it bogs out but its harder to stall it like this. PLease help.

[osirus74]

no ideas?