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Discussion Starter #1
Now where to begin, it all started 3 weeks ago when i drove off in my car leaving my house. I let the car warm up and as soon as i get to the first light my car decided to stall. I fired it back up with no problems and drove to the next light where it decided to stall again. This time the car had a hard time going to idle so i had to give it a couple of revs so it wouldn't die on me. I decided to turn back around and head home to check the problem. When i started to drive back home my car stalled when i switched from first to second and the engine cut off but i still had power because the dash lights were on. Turned it back on and went straight home into my drive way. I started to give the car a couple of light revs and it would struggle to go back to idle or just cut off. I did a lot of research on what the problem could be. I cleaned out the IAC valve, throttle body, MAF, Blitz pod, checked my throttle body gasket, intake manifold gasket, and IAC gasket doing quick sprays with carb cleaner to check if the idle would change and seems to me that the gaskets are still good. I changed majority of all vacuum hoses, switched to three different types of blow off valves to see if that was the problem, looked at all my fmic couplings, installed new spark plugs even though the spark plugs i had were new. When i switched them out they were really shot of having them in for a month. Now my car won't even start after changing out the spark plugs. I don't know what the problem could be and my exhaust is spitting out black **** with a lot of moisture. The thing is its not oil thats coming out and sometimes blows black smoke. The black stuff looks like carbon gunk mixed with water and a lot of it shoots out. I'm thinking its because I live in a hot/humid area that the car is just getting moisture built up and just shooting carbon out but then again i could be wrong and it could be something else. It doesn't feel like and smell like oil. After changing the spark plugs out my car won't even go to idle no more. It would crank strong but just die now. At first i thought it was a vacuum/boost leak, but now I don't know what else it could be after switching out the spark plugs. I have a boost controller but i rarely ran it on high boost because i was waiting on coil packs and when i would try it on high boost, i kept it at 10psi. When the car started stalling and was still drivable, the car did not feel sluggish. The fuel pump still primes strong and battery and alternator is still good. I reseted the ecu a lot of times after every clean up i did. I checked all the fuses to see if any would be the problem. The one thing i didn't try was changing out the 02 sensor but i'm thinking its far beyond that problem or it could just be multiple problems only because that black **** is spitting out of my exhaust. Someone please help and give me advice.

mods on the r33
-Blitz SUS filter
-HKS ssqv4
-3inch dump pipe all the way down to exhaust
-fmic
-greddy trust profec boost controller
-Nismo fuel pump
-S2 pink label MAF

and thats all i can really think of for performance wise. I'm pretty sure all other performance parts are stock. bought the car used 2 years ago and it ran like a champ till 3 weeks ago. I'm kind of wondering if the Nismo fuel pump is pushing too much fuel pressure because the fuel pump came out of a r33 gtr if that would make a difference and maybe caused the engine to flood. I recently switched to the Nismo fuel pump due to my original fuel pump going out...or it could just be a ****ed up O2 sensor...no check engine light is on if thats a good thing.
 

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Check the air bypass/cold start valve, they tend to fail open so you get far to much air making for a weak mixture, and this will show up most at low RPM/load.
 

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Makes a nice change to have a lot of info lol....Where the plugs wet when you took them out after the bad running?
 

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Discussion Starter #5
i didn't check...i started the car today after swapping the MAF from my friends r33. it fired up fine and went to idle...then the idle started to fluctuate. waited a little longer and the fluctuating started to become worse...from 500-1000rpm then from nearly cutting out and catching itself then nearly cutting out and catching itself so on and so on...then it started to rain outside so i went back inside the house. the next time i'll check and let the car idle for awhile and i'll pull the spark plugs off to see when its clear out.
 
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