KA Problemo

[l2edken]

Hey guys, just finished putting a s14 ka in my 89 240sx. Cars starts and idles like a dream, but it seems like i cant rev it past say, 4/4.5k and after revs if drops very low, sometime 100-200 rpm, then catches back up and goes to idle.

Possible timing issue? TPS adjustment?

[iveexcaped3]

Read mine about two down let me know if it sounds like that "ok I've tried everything"

[x2fast2belegalx]

posted in his. change fuel pump and filter. same issue i had, ran fine when not full throttle. and would rev past without full throttle. but otherwise sounded like a limiter going off.

[project-D180]

maf sensor will give u that issue and aic will cause rev to drop low then settle where it needs to be

[l2edken]

fuel pump is a walBRO and fuel filters brand new, i tried spraying some cleaner in iacv line and it did seem to make a difference so after work im going to tear that apart and give em a good clean. The maf is a replacement that i know is working, had a different maf and it wouldn't run for more then 5 seconds, installed this one and now the car will stay running, it just drops more and more.

[project-D180]

check throttle position sensor also n aic harness.make sure there is no build up on wires cuts in wires

[Pro ViZIon]

if you have stock fpr you will be running rich with that walbro. Check your plugs and see what shape they are in.

[alexanderig]

i had same issue i changed fuel pump (walboro) and fuel filter and cleaned the maf.

[l2edken]

So after much work, it seems like the timing with off with distributor, after a quick adjustment to that, car idled consistently and now revs no problem. No sturrering or hiccups at all. 1 Thing though, After a hard rev the rev will go to about 400 to maybe 600, then back to 700/750 after a second or so. Whats would cause that drop in idle? TPS not communicating correctly with ecu?