so yeah, trying to finish this car off, and I'm having a few issues...

idles OK, a sputter here and there....

under acceleration, it's smooth till about 1500RPM then starts breaking up, popping, and just losing power, i've already put two different MAF's on the car, did a boost/vac leak test, so system is sealed...

i checked time, with a light, and was close enough for gov'mnt work, if not spot on...

i also checked TPS signal, was at .57V and put it at the .45 as used by Nissan...

engine grounds were loose, so i tightened, and even added one on the driver side... and that helped with the idle, as well as setting the TPS...

tomorrow I'm going to pull the valve cover off, and check cam timing, and restab the CAS....


to me, it feels like a boost/vac leak, but like i said, i put an aircompressor on the turbo inlet, and found all leaks (at the couplers), and even went ang got a GReddy hot pipe and HKS SSQV with super low miles for it (as the TurboXS RFL that was on it was leaking like a bitch, and still, no joy..

SO, with that being said, there's a few more things i'm going to check-

Cam/CAS timing
MAF signal (as it MAY be the problem)
spark plug gaps
compression test (although 0mile motor built by a professional)




one more thing, with a blown T25 cause it to run like that? i noticed the T25 on it has a fair amount of shaft play, but not as bad as i've seen on some cars, and does spin freely....

usually i handle my own shit, but here i'm getting kinda stumped, especially if my cam timing ISN'T off....

 

timing gun.
If it was 2500 I'd say your mafs wiring was booped..

Also, check your coils as well.

 

i'm thinking it might be the maf wiring too


oh the harness side, it was five wires, on the pig tail side, three wires...

so i did white to white, black to black, and black with stripe to black with stripe... didn't know what to do with the other two wires coming out of the harness, the brown one, and the black w/silver dots (ground)

 

check the ecu for codes?

 

ECU doesn't have the LED, was never even installed, the solder points are there for the LED, but it's not there....

that's usually the first thing i do anyways... but i'm stuck chasing gremlins the old school way....

 

well today i....

gapped the plugs (were at .45!)
reset/checked cam timing/CAS

car still bogged...


ordered a 255 fuel pump from enjuku, seems as if the car isn't getting enough gas, when it bogs and back fires, no black smoke comes out...

also, while clawhammer and i were trying to get a LED to work on the ECU, a relay kept clicking in the fuse panel... my assumption is that it was the fuel pump relay, turning the pump on and off to maintain pressure due to a leaky/faulty pump...

compression is 150 x4 with no more than a 2psi variance... so that shit's on point, and motors good....



thoughts?

 

i had a short INSIDE my ECU once.... apparently the ECU that came with my motor had already been repaired with sodder and it repopped/melted. Same issue, idle fine, but any sort of load on it it wouldnt get up in rpms.

No idea what pin it was- this was over 3 years ago now.

 

Yeah Marshal, I was gonna say check ur plugs but you beat me to it. Is it still popping at 1500 or has it moved up a lil bit now? Do u have a chance to even get into boost?

 

goddamn i love enjuku!!! i ordered thier ISIS 255 pump yesterday around 3:45, and it's sitting right here in front of me now!!! talk about fast shipping!!!!

as for the ECU thought, we'll see after i change the pump, worse comes to worse, i'll pull My NIStune ECU out of the black car, load the base map (OEM "tune") and see if that fixes it if there's still a problem...

 

found the problem, i love enjuku for excellent service and products...


FUEL PUMP!!!

i ordered it yesterday, came in today, swapped it out, goddamn car had an OEM 240 fuel pump... not a walboro, and it looked shot out...

either way, swapped the pump, car now hauls SUPER ass... those little t25's are quite responsive....

it's still a little sputtery at idle, but after 1k RPM it pulls like a motherfucker, runs a bit rich with a fair amount of black smoke, mixed with tire smoke cause it lights those little 180SX wheels UP!!!

thanks for all your help guys!! if you have any ideas on the sputtery idle, and richness before i fix it myself, be my guest!