my sr is idling like S*** helppppp

[michaelmontuori]

ok i know this has probably been gone over before but ive searched and only found a few things about it i swapped an sr in my 89 coupe, and its been running great and everything, but my problem that came out of nowhere is the fact that if im sitting at a light or anywhere for that matter ill rev my car a bit and then the idle will go to like 200 rpms and bounce back up, i AM running an hks ssqv to the atmosphere but ive been running it for over 3 months now and i have not had one problem like that before, why would i have a problem now with it and not before, JUST LIKE I SAID WHY WOULD I HAVE A PROBLEM NOW WITH IT. and i want to recirc it but i just want to know the reason why if it was fine for a while what all of the sudden would make it do what its doing now? ohh and i have an auto redtop ecu if that helps at all

help me guys

mods are,

redtop sr20dets14 t28hks wastegate @ 12psifmic w/hardpipesapexi intakeka24e maf3 inch turbo back with no cathks ssqvmishimoto radiator with fans

[240life]

is it sputtering or popping under acceleration at all?

[michaelmontuori]

honestly its not running too bad, and i recirculated the bov and it did NOT help at all, but it is all of the sudden backfiring when i shift now, but its not really sputtering at all

[240life]

I would check for boost leaks

[michaelmontuori]

ive checked for boost leaks and i hear no hissing or noises when i attach the compressor to the intake, also could it maybe be bad plugs? im running 300zx turbo plugs

[240life]

plugs are a possibility

[michaelmontuori]

ok well all of the sudden it got better, it still backfires here and there which i guess is normal but now it only does it when i rev it to about 2000 or so rpms, it still dies down but everything else seems to be fine, so i really dont even know what to check next, its just weird how i didnt change a thing and this randomley happened

[michaelmontuori]

and now that i think of it i used to run 10w-40 pennzoil and i just did an oil change 4 days ago with pennzoil 10w-30 would that be my problem?

[michaelmontuori]

anyone else?

[michaelmontuori]

UPDATE- plugs are good, no boost leaks, switched back to 10-w40 and it still wants to stall when i rev, i work right near 240sx motoring in milford, jeff said it could be the ecu, but i didnt get a chance to ask him why, anyone have an auto ecu with the same problem? or any other suggestions

[the.rise]

not trying to thread jack but i have the same problem at times.. usually when the cars cold if i come to a stop with the car out of gear+breaking the rpms will drop to 3-400 and sometimes completely stall out. im seeking a cure for the problem as i sit here

[michaelmontuori]

is your bov recirculated and what bov are you running, what have you tried to fix this problem?

[slidestyle69]

Its sounds your IACV could be a possibility here, and on the backfiring issue, check your timing and make sure your not advanced (detonation)

[michaelmontuori]

ok i figured it out FINALLY, i had one of my friends (tech at nissan) check my timing, and it turns out i was running 17 degrees for the last month, we redid the timing at 15 degrees BTDC and its all set, as for the iacv its all good!

thanks guys

[Sr20S13Det]

i really hope thats the problem with my car it does the same thing. i run my RS BOV atmospheric but didnt have a problem until a couple months ago. Ive checked the TPS, IACV, plugs, and boost leaks. Ill get right on that tomorrow thanks alot guys

[michaelmontuori]

yeah try your timing it helped my idle out ALOT

[ZOMG.SR20]

how did you check your timing?

[michaelmontuori]

with a timing gun/light . . . . . .

[ZOMG.SR20]

I know that but where did you hook the signal wire to