unstable idles and sometime it dies out.

[PDX_S14]

lately my red top sr its running unstable..... it start up fine.... idles fine...but once i start driven and come to a complete stop the rpm goes up and down during idle sounds like i got wild cams up in there which i dont and sometime it dies out too.....after it dies out it will start right back up.....i have searched here and zilvia.net.. ppl said maf, ic piping, leaks, tps , timing , speaks plugs....well i checked all that so where else should i look....... i tested the following items

* MAF putting out 1.5v idle and 4.0v at 4000 rpm* no leaks at the ic piping*TPS its puting out .50v at idle wot was 4.5 or so. and also i did ohm test is less then 1.5 ohm*checked all the vacumm lines no cracks or pinched lines.*timing is right on 15* +/- even took the valve cover off and reset the timing.*CKP is right on the dot*everthing on the manifold and the turbo are tight.*spark plugs are fine its gap at .28 and i chaged them less then 2 months ago.

Modified by PDX_S14 at 4:53 PM 8/9/2006
Modified by PDX_S14 at 2:53 PM 10/13/2006

[S13FASTBACKSR]

tps should be 4.5v at WOTcheck your ecu for codes as well by the way any other problems..misfiring/hesitation burning rich? or just bad idle...but yes check your ecu for any codes it will probably throw you a tps code since your voltage isnt right for WOT..that is why at idle your car its fine before you drive your car then once you hit WOT you get the problem...let us know

[PDX_S14]

opps... i think it was 4.5v but i remember it was in spec. i can check it again ..... the car drive fine.... just when i come to a stop the car all the sudden idle goes up and down like some wild cams and most of the time it dies out.....

[S13FASTBACKSR]

sounds like a possible bad IACV. If you say the tps was at spec during WOT then I would check the ecu for codes first.

[PDX_S14]

i think i found the problem.... i retest the tps....and it fail on me.... when i snap the throttle.... the voltage didnt go up only when up to 2.5v....so going to chage the tps.... hope this fixed the problem......thanks for the reply s13fastback
Modified by PDX_S14 at 3:04 PM 8/11/2006

[S13FASTBACKSR]

awesome hope it works out for you..im having a tps problem right now as well ( i hope thats it atleast..easy fix) let us know man..good luck

[otterman]

I thought spark plug gap was supposed to be 36?

[PDX_S14]

lets hope so ..... tps wont be here til next week...

.36? i think the FSM tell you gap .32 correct me if im wrong .

[karmakaze]

lets hope so ..... tps wont be here til next week...

.36? i think the FSM tell you gap .32 correct me if im wrong .

i have mine gapped to .28 anything higher than that and i blow my spark out under boost.

[S13FASTBACKSR]

Im not sure what the fsm says about the gap but i know the more boost you run the lower gap you go..im not sure what gap range is right for what psi range though so this probably was pointless

[khai01]

Have you guy got the idle problem fix. I got the same problem 2 week ago. I thought it was my BOV, the Hks SSQV they commonly goes bad. I took it apart and clean up very good. I have not drive the car very hard yet. I did took it out for a test drive and when came to the stop, I didn't have that problem.

[PDX_S14]

not yet khai01... im still waitting for my tps to come in.... but ill give it a try... i got the blitz dd bov... the spring might got some carbon build up.... since i waitting for part anyways.... give me something to do

[S13FASTBACKSR]

i think i found the problem.... i retest the tps....and it fail on me.... when i snap the throttle.... the voltage didnt go up only when up to 2.5v....so going to chage the tps.... hope this fixed the problem......thanks for the reply s13fastback

by the way are you sure the tps wouldnt go past 2.5 volts? you had the TB wide open? and did you move it slow or just literally snap it..you werent noticing any other problems other than bad idle? usually a bad tps will cause performance problems..let us know

[PDX_S14]

ok the tps now put out 4.25v at wot... at idle is at .55v...... problem still happening.....umm....... where should i look now? when i rev it a little...... the car after fire around 2000 rpm .... should i try put in a different maf ?

[PDX_S14]

umm.... just got home from another test drive.... the car is driving fine no problem with idling or dying out and it seem faster ?!! or maybe i just been driving my ghetto 87 camry arouund the pass few days.... lol

i havent switch the maf yet and still the same maf and tps.....
Modified by PDX_S14 at 1:18 AM 8/18/2006

[S13FASTBACKSR]

so now your tps is functioning right? as far as the voltage when you check it? it sounds like you have a tps that works when it wants...by the way i dont think its your maf sense you are not running rich

[samadam43]

Maybe this will help you out... http://forums.freshalloy.com/s...=iacv

[PDX_S14]

ok guys... the problems is back after a new tps.... and it got worst......

[ser2102]

have you tried messing with the iavc or whatever you call it? i had the same problem, really rough idle and would die at stops. all i did was give it a few turn and the engine ran and idled PERFECTLY. only needed about a twist and a half.

[PDX_S14]

ok ill give that a try tonight.....

[S13FASTBACKSR]

usually when your iacv is dirty it will idle bad from start up and the rest of your drive not after you start driving around..same for the idle adjustment screw say its set too low..its not gonna start idling out after you drive around its going to do it right away..it sounds like your bov's spring is to loose what kind of bov are you running? try tightening the screw

[PDX_S14]

umm... i'm running blitz dd bov... the screw is tighten down into the nut...so its leveled with the nut...it didnt have the problem before, never touch the bov ever since i put the motor in..... will so far i adjusted the iacv and change out the fuel pump and spray carb cleaner in the the throttle body and clean back of the throttle plate... the probem seen went away.... so i guess my fuel pump is about to go out or the throttle body is dirty that affect the iacv.... hope this fixed the problem... if there anymore problem.... ill repost again.... thanks for the rely guys....

[Blown240sx]

you need to check th MAF voltage. Should read 1200 mv at (1100 rpm) idle I believe or a bit less for idles lower than that.