Thread: spark plugs fouled with dry black carbon?!?!

i see like the Qu type looking numbers those read 35215 Qu with acc on engine off. the injector duty says 0.10% the puleses are normal at idle like 1500 or something, i donno

i pulld the fuel rail and injectors this morning and i pressure tested them at 40psi and no a single one leaked. i guess i can rule out injectors now. but still dont know whats causing this

i do see that my fuel pressure seems to be bleeding off soewhere in the system and if not in the injectors then where?

i am starting to think leaky fuel pressure regulator o rings or leaky fuel pressure regulator altho the nismo fpr is only like 1300miles old. and it does adjust fine, maye leaky fpr?

i know my fuel lines arent leaking thats for sure. definitly starting to think its a fuel problem rather than ignition problem as all my ignition stuff as far as software and physical distributor hasnt been touched moved or messed with.

The fact that it sat so long is reason enough to have ruined the plugs because the buildup eventually has a chance to get more solid. Happened to me once except it was so bad the car would not even start until I swapped out plugs haha. So what I mean is that even if your ignition stuff hasn't been changed, you shouldn't rule it out because even if it worked fine then, letting it sit too long could change that (because didn't you say you were unable to find replacement plugs?)

If you put in clean plugs and the running problem was the same then maybe rule it out though.

Advancing the timing is quick and easy though and it would give you a better idea haha

well the thing is, the timing was set by the tuner and it wasnt just a base tune, have about 5-6 hours worth of configuration and tuning with it. why they set the timing there i donno, but it seems to work.

and as far as it sitting i mean the car was tuned like a month ago i start it daily, and the car was running imacculate from the tuner, plugs,were fine for the tune, i cant forsee how the car could get like this just from then to now which is no time, and grant it , i know things go bad but ****.

i mean ive ruled out:
injectors
injector o rings
map sensor
intake temp sensor
tps sensor
distributor cap
distributor rotor
spark plug wires
coolant temp sensor

i think its definitly a fuel prolem altho im not 100% but if i turn the aac on, and build fuel pressure then shut my car off, it will bleed down to 0 which i dont think is normal altho i hav read a few post that it has happened with no negative effects but it doe mean its bleeding somewhere

and to the fact that my fuel pressure with the aac on, bleeds down 10-15psi, thats definily not normal, and all of my fuel lines are tight and all that, so its either the fuel pump or the nismo FPR, becuase i have tested everything else with no definitive results other than my distributor cap and rotor werent good, and my injectors keep fouling

i have also read if you have a aftermarket fpr AND aftermarket fuel pump, it cn throw off the fuel pressure readings thus giving you incorrect fuel pressure adjustments.

anymore idas, before i towe the car to the shop.... :o( realy not what i wanna do but m having no other choice

i adjust the fuel presure a littl more and the car starts up pretty ood still have to give it a little gas and it idles, not good but it idles. but when i try to go, i let the clutch out and give it gas and it either fls straight on its face...or it bucks like crazy...now the spark plugs in the car ARE fouled, BUT thats my 4th set of plugs i am hesitent on gtting more and just fouling those. i mean i gapped them to .28 and i donno if thats too small or what, but its STILL running rich with carbon fouling!!!!!!!!!!!!!!!! just at a total loss. its like all the money i spent on the recent tune and wiring to get it fixed was all for nothing, and i didt even get to drive the car, so sad so sad so sad so sad so sad so sad and mad

Can you put a stock FPR back in to test fuel pressure stability?

I had fuel pressure leak down with the car off, that was due to one or more of my 740cc injectors. I put the 370's back in which corrected a few other issues, and the fuel pressure has held overnight, now. All o-rings/seals for the fuel injection system were perfect. I think one or more of the 740cc injectors was stuck.

well i was thiknig of buying some dsm 550cc injectors but im not sureif they will or will not fit on the msd clips. all of the injectors pulse the same tho, nothing looks off with them, and like i said i pulled the injecotrs and none of them leaked at all, that was with a tad over 40psi

i am looking for a Stock FPR locally as i dont have one, no luck yet tho

altho too, my nismo fpr holds pressure fine at idle so i donno

edit: oops i posted again haha

Crazy idea here idk if it will work or not but why not remove the FPR temporarily and block off both ends of the line?

Then put the key to ACC or w/e to apply pressure to the line and keep an eye on the pressure so you don't go too high. Doesn't even have to be up to 40. If the pressure drops after a while than you know it's the pump, and if not it must be the FPR.

A little risky maybe but seems like it would work? As long as you kept the pressure low.

http://www.youtube.com/watch?v=AgE2jwX4kmE&feature=related

i was sarching youtube for different symptoms of different things related to both fuel and spark, and i found that video, my car sounds and acs just like that, evento the point where the car just fals on its face and dies. then he tries to restart it but no luck. i just have a hard time believing ALL my inectors went bad at once, i donno