Stalling Car

[aaronrb25det]

i was sitting at the lights today when my car suddenly droped from idle-800rpm to a near stall only to correct itself instantly. i took off and drove about 100metres when it suddenly did the same thing,but this time whilst driving. since then it has done it several times. it doesnt sound like it is dropping a cylinder,and only looses power or nearly stalls for a second before returning to normal. the car is an r33 s1.5 det. any ideas??

[zaffa]

could be coils or plugs..sounds like something electrical....afm also...or een crank angle sensor....try the chea stuff first or take it to a workshop if your lazy....or if u do stuff your self find someone with same car and swap coils over and see if it still does....if still does it tr afm....and the crank angle sensor u will probably need a shop to do anyway...

[treo]

Maybe if it had a distributor and coil it could posibly be leads or coil. However you have an individual coilpack for each cylinder. Id be looking at 'Cas' or something in the fuel system, faulty 'fuel pump', when was the last time your fuel filter was changed?

[paulr33]

what bov

[aaronrb25det]

i just changed the plugs a month ago to ngk bkr5eix-11 re-gaped to 0.8. I have changed the fuel filter about three months ago, and fuel hose. the bov is a GFB atmospheric vented valve, but ive got a HKS EIDS, to control the rich spike. ive noticed since i have changed the plugs it misses the slightest bit when idling.

[GFunk]

mine was running like shit and nearly stalling cuz of an o2 sensor. It could be heaps of shit. Anyone or any performance mech will just keep swapping or fixing shit till they figure it out. Just take it to an EFI diagnostic workshop and they will figure it out quicker and cheaper. Then take it to your performance mech to be fixed or do it yourself. That's what i did

[zaffa]

what he said ^^^

[paulr33]

busted o2 wont make it stall, try stock bov. the bov is venting air the computer is expecting to have 100 units of air but your bov vents the majority of that air to atmosphere so it only has 20 units of air in the system so it adds fuel to match 100 units of air and stalls cos the mixture is off the planet. atmo bov = stall

[Craved]

BOV will not cause the car to nearly stall while moving off after lights, only when about to come to a stop..

[aaronrb25det]

the problem is so intermitent that it seems eletrical. the car will run fine, then every now and then it wont completly stall, yet drop its rpm too low, or loose all power breifly whilst driving.

[blind_elk]

If there is nothing significant in terms of performance mods, eg higher boost, then re-gap the plugs back to the factory / design spec, ie 1.1mm

[aaronrb25det]

im running slightly higher boost,with an apexi avc-r. ive got exaust, pod,bov and boost.do you recommend regapping back??

[paulr33]

change to stock bov, problem gone

[maxwolfie]

Yeah, mine does that as well.. RB20DET S13, non-stock BOV

I'll try tightening the BOV up, and also my battery is a POS!! When I turn my 2 x thermo fans on, revs drop by about 200!!

[gts25x]

sounds like afm to me.

iv got a s1 r33 and had the same issues.

changed my afm and havnt had a problem since.

[TTT]

My S14 had a similar problem.

Mine turned out to be the wiring to the AFM.

basically, the AFM plug, the cable that goes off it, when my car is idling fine, if I touched the wire or moved it in a certain direction, the car would stall.

I did the cheap option and found a position where it wouldn't stall and taped it to there.

it's not the bov or it would happen when you are COMMING to a stop after venting the bov.

and you have that HKS doobie anyway..

start your car, open bonnet, move the AFM around, move the cable from the AFM plug around..

see if any of that makes your car stall.

good luck