WTK:any good RB mechs.RB cutting off in traffic

[themusician]

i have an S1 RB25DE motor.thing is there is a miss in the idle when the car gets hot.i checked the coilpacks and they seem to be fine.i did a tune up recently too.i took out the idle unit and cleaned it as well.when the A/C is off and the car is left to idle it sometimes cuts off.i did a diagnostic and all the sensors are good.other than that,the car drives just fine.can anyone provide me with some feedback on this problem??

[XP50]

1.) clean your air flow sensor.
2.) make sure all vaccum lines are in tact, no leaks
3.) make sure you don't have a faulty plug
4.) make sure that the safety pins for the injector harness are properly intact.

[GA16]

Change yuh plugs

[Ted_v2]

if you need a tech, call this guy. He helps me alot 341-3662

[skylinechild]

a couple of things to try

1. start car- let it idle up to operating temperature and start to "miss"
start unpluging and pluging back in coilpack wires one at a time to see if there any difference in engine RPM or sound

2. do the same for the injectors- unjack one from the harness- and plug it back in- listen for any change in RPM and sound..

if there is a difference on engine sound it means that the specific combustion chamber( cylinder) is functional - ie fuel and spark are present and power being generated - youre looking for the one when unplugged makes no sound difference
essentially youre looking to determine which one isnt firing properly by removing fuel- and ignition source.

if all 6 are firing properly - both fuel and ignition source- you need to check your vacuum lines / hoses etc.

another thing you can try
again bring engine up to operating temperate normally, until it starts to miss
get a spray trigger bottle and fill it with water.

youre going to spray the coil packs make sure its wet properly - youre not going to engine wash it -...do each one one at a time....and listen for engine RPM change.

still no change??

now target the intake manifold - where it bots onto the engine - do one part at a time- if theres a change when you spray on the intake manifold it means that the intake manifold gasket is bad...

ie its not sealing off properly - it's letting in air that wasnt accounted for by the air flow sensor - thereby upsetting the air fuel mixture causing the engine to miss.

i'm a bit intrigued with the problem though...you said when the A/c is off and left to idle it sometimes cuts off... you sure all your sensors are fully functional???