hempstar420

ls1 powered nissan silvia. full motor pullout from a 2000 camaro

did first start up today and it runs like ****. wont idle at all and i can barely keep it alive by opening the throttle. if i open the throttle alot it simply cuts out entirely. i have disabled vats and set the column lock thing to not equipped an fuel cut to 250mph. everything i read about this says its vats or fuel cut but its not i just left my tuner an both things are as they should be..

all sensors have power, throwing no codes, plugs gapped at .060, fuel pressure 58psi while running,

only thing i can think is maybe my wiring. i wired all the sensor 12v constants as well as the ecu battery wire and switched ign wire to a single switch with 14guage wire. could this cause it to run like ****? to much amp draw on the single wire?

any help is appreciated got a drift event in 2 days if someone solves this tonight ill actually pay pal u 50 bucks ill be checking this every few mins and im in my garage so ill check/test whatever ideas you guys can come up with immediatly.

wildcamaro

iTrader: (15)

Yes could be that all the ignition hots don't have enough wire material to get the proper voltage...check voltage at the sensors and see if you are getting 12 volts or so...when I did harness I used 10/12 gauge for every three or four wires...hope that helps good luck man

dreww

iTrader: (1)

Need more info....is it a stock ls1? Stock tune?
if it was fueling issue (especially vats), it would probably cut all fuel (I.e. fuel pump and/or injectors wont cycle).

hempstar420

stock engine stock tune with maf long tube headers and 3 inch intake.

fuel pump is wired to a switch directly so it cannot be cut and when i checked the injector pulse i couldnt tell if it stopped working before the motor died or when it died becuase it cuts out instantly. like 2000 rpm to 0 in a second. then sometimes able to catch it an do it again by tapping the gas.

ive checked the voltages at the sensors many times. checked the coilpack power while it was running even an watched the volts change between 12.25ish and 14v and even saw it jump as high as 18v. i was thinkin that could be a little weird to be that high?

mark21742

I sent you a pm, call me!

hempstar420

anyone got other ideas?

mark21742

Did you get it figured out?

TransAmcoupe98

iTrader: (10)

Stock tune...there's your issue. Something small can throw a tune way off, even headers.

Old Geezer

iTrader: (3)

try the correct forum?? More likely to get some diagnostics help........

bczee

iTrader: (12)

Check for Vacumn leaks, that the MAF is wired correctly and clean, check the Crank and Cam position sensors, connect a scanner to see if all of the sensor are being read.

Who did the wiring ?.. maybe some crossed wires ? some of the circuits are 5v, be careful not to give them full 12v.

Good Luck...

BC

Pop N Wood

iTrader: (1)

Air leaks downstream of the MAF will do that. EGR plugged, like said above no vac leaks? MAP sensor working?

RNation0001

iTrader: (2)

on my first swap i had a similar problem and it was a bad maf and tune

hempstar420

could running it with just open headers cause this? not enough backpressure? checked vac leaks there are none i did the wiring myself but ive checked every sensor with a multimeter and they are all functioning properly.

Nissan LS240

iTrader: (1)

if you don't have scan tool to read maf reading, unplug the maf and see if it will stay running, might take a couple of times for the ecu to decide to go into limp mode but if runs with maf unplug its probably your maf.

cam

iTrader: (9)

Is the IAT installed and wired correctly?

Your certain the plugs for the coils are going to the correct banks respectively? Did you check compression?

mark21742

Talked to him the other night on the phone end went over every little stupid thing I could think of I was shocked that my car fired up and ran (very rough) but ran with one coil bank unplugged

hempstar420

yea compresions good. IAT is not in my intake piping but in the engine bay near the air filter so reading should be accurate. double checked cylinder banks and wiring is all in the right place. i do have a scan tool to watch maf readings but i dont really know what the readings are supposed to be so its kinda just a number that means nothing to me. when i unplug the maf in instantly dies. the 12v constant to the MAF is on the same circuit as the ecu power and o2 sensor power. would there be enough of a voltage drop running 12v to so many things on this circuit to cause serious problems with no codes??

Emdmechanic

iTrader: (2)

Did you change or clean injectors at all or rather how long did they sit.. Mine ran like **** untill i cleaned them.. twice. just a thought. Gl!

mark21742

MAF and sensors should be only getting 5v if I am correct

hempstar420

motor was running perfectly in the camaro i got the whole pullout from a month ago. I thought that the maf wires were pink 12v black/white ground yelow 5v reference from ecu