Wont idle and stay running

[SilviaSlydSydway]

I just installed a TO4B turbo on my car along with SR 370's, Walbro, FMIC, Full 3" Exhaust, and a Stock MAFS. I just got my afc tuned when i found that i had a leak in my valvecover gasket and engine was low on oil. I put oil in and pulled it into the garage and it ran fine. Then, when i got a new gasket and started it up...the car wont idle and only runs good when i am on the gas. when i am not on the throttle the car tries to shut off. And when i started it up the first time it had more than enough oil, because i filled it up in the dark and couldnt see the dipstick, but as soon as it idled bad i drained it. Anybody know what it could be. Thanks

[SilviaSlydSydway]

Anyone???

[DammitBobby]

I would check to see if you have any IC leaks or vacuum leaks. That would be the first thing I would check for. What is your vacuum reading?

[SilviaSlydSydway]

it was reading -20 at idle, the line for my iacv is a little kinked because the angle it has to clear the fan, but it is still getting air through it. Would it cause bad idle if it was restricted?

[WDRacing]

Definitly...crimp the linbe, the car dies. When you apply throttle the plate opens and allows the engine to breathe. Unkink the line and let us know.

WD

[crzycav86]

Definitly...crimp the linbe, the car dies. When you apply throttle the plate opens and allows the engine to breathe. Unkink the line and let us know.

WD

Or it could still be a big vacuum leak. the maf is getting wrong air readings at idle, but when you give it some gas and hold the throttle constant, the computer switches over to oxygen sensor readings, which doesn't rely on the false maf readings.

Both are possible, but I think my diagnosis is more common for these symptoms.(I like playing 240sx doctor) the idle air problem is probably easier to fix, so i'd start there first.

[WDRacing]

Psssht...can't be....duh

[SilviaSlydSydway]

Yeah im going to put a new line on the iacv so it is not restricted at all. I'm going to get a new o2 sensor to. And i forgot to say that when i take out the plugs after it runs for a minute, a little bit of smoke comes out from the second cylinder. So im gonna check the compression, maybe the cylinder is scratched or something?

[FabroKA]

i have seen this problem before like he said its probly a vacum leak. thats not my consern for you though. my consern is that you may have detonation problems if it prosists. my buddy, blew his up this way, the reall issue how ever was a hack tune job he did with his afc that got his fuel too lean and then the bad vacum signals compounded it. check your fuel controler maps too.

[SilviaSlydSydway]

yeah i cant find any vaccum leaks, but i removed the emissions on the intake manifold so i will look again. i got it dyno tuned at philly dyno works and my a/f ratio is ok.

[FabroKA]

are you recurculating or do you vent alot (not all) of guys have luck recurculating the waste gate and pcv, nissans are disinged to use that very effectively. but they don't have to

[FabroKA]

the afc will let you control the idel and fuel on the fly. i recomend it by all means

[SilviaSlydSydway]

I have a safc, but i dont have a wideband, so i can't adjust my a/f ratio. i have my bov recirculated, but my wastgate has a straight dump pipe. Is it better to have the idle air line in the coldpipe or in the intake pipe. I have piping from an old nsport kit so it has the line going to the intake pipe before the turbo and after the mafs. i see that alot of people have it in the coldpipe, so i didnt know if it got a better reading or whatever. I was also thinking maybe my mafs died???

[Edub1]

What did you disconnect when you pulled the vc off? Check your plug wires.

[SilviaSlydSydway]

What is the "VC"? today, i took out the plugs and they were really wet. I unplugged the fuel pump and it ran alot better for about 30 seconds and idled until it ran out of fuel. But it ran for a good 30 seconds with the fuel pump fuse out. I guess it is just running really rich, but i got it tuned and it rn fine. My afc is set to -23 to -27 across the low thingy. Maybe some connections for the safc have come loose and it isnt correcting the fuel right, but i didnt see anything disconnected. I have a stock fuel pressure regulator too.

[Edub1]

You said you fixed your valve cover gasket and the problem began. Perhaps you knocked something loose?

Anyway, wet plugs = rich. Test your pressure reg as per FSM.

[SilviaSlydSydway]

im gonna check all the connections on my safc tomorrow. When i have my safc on 1 or 2 channel, it reads fine, but when i have it on 3 or 4 channel, it reads that i am at 100% throttle. Anyone ever have this happen to them? I cant check my fuel pressure because i dont have a fuel pressure gauge. Is there any more ways. Like i said, it is a stock fuel pressure regulator, do they ever just go bad? Thanks

[dcmxsa]

bump

[SilviaSlydSydway]

I think my friend might have figured out the problem. If i have a small hole in my oil pressure gauge line and my oil pressure is low, will my fuel pressure be off. I have a stainless line im puttin on tomorrow, but could that cause it to run way to rich???