Car just isnt working NEED HELP

[s13disaster]

hello guys, i have been without my car for 4 months now and i really need to get this thing running... i have an 89 240sx with an RB25DET swap... i bought a plug and play harness and adjusted the timing... but the thing still wont start any ideas?

[Carl H]

fuel lines backwards?

[s13disaster]

no i double checked that they were on there properly, though i just downloaded the fsm and when i timed it, it wasnt at tdc it was at like 9 btdc so would that make it not start lol just curious

[RRRRB]

have you changed the timing belt?

does it have fuel pressure?

does have spark?

need alot more info in order to help you

[Shocker]

Pull a plug leave it on the coil and put the ground strap of the plug against the head, have someone turn the motor over see if it sparks. If it sparks put it back in turn over some more pull a plug see if its wet with fuel... If not make sure you have fuel pressure. If you do make sure the grey wire on your injectors harness has a 12v signal going to it from the ignition on.

[95_240]

Where did you get your harness?

[s13disaster]

i got the harness off ebay... it was a plug and play harness... i also reset the timing and now when i turn the key on and prime the fuel lines it tries to start but then doesnt.... right now it has the original fuel pump in it but i ordered a walbro 255 fuel pump... could the original pump just not be strong enoughto get it started and running?

[Shocker]

i got the harness off ebay... it was a plug and play harness... i also reset the timing and now when i turn the key on and prime the fuel lines it tries to start but then doesnt.... right now it has the original fuel pump in it but i ordered a walbro 255 fuel pump... could the original pump just not be strong enoughto get it started and running?

No.

Did you do anything anyone asked above as the basic debug for an engine not starting?

[RRRRB]

ebay harness scares me

[s13disaster]

the harness is from wiring specialties

[s13disaster]

so i finally got the car running and now i am having problems with oil pressure... when it is running at 1800 rpm my gauge is only reading about 1, then when i give it a little gas it jumps to 7... why would it be doing this???

[Carl H]

1 what? bar? psi? pounds furlong? dreams per hopes?

[s13disaster]

psi

[Carl H]

1psi would be rod knock central...what brand gauge and is it properly installed?
sure it isnt gauge number x10?

[s13disaster]

it is x10 so it is running at about 10 psi at idle, then and now when i give it some gas it jumps to about 5 then goes down to 0 when i let off the gas... i am pretty sure i have it hooked up correctly

[s13disaster]

by 5 i mean 50 lol

[s13disaster]

and what wire do i splice into to hook up an air/fuel ratio gauge

[Carl H]

if you're talking about a christmas tree style gauge then just the middle pin on the o2 sensor...dont remember exact pin off the top of my head.
10psi at idle is low but not horrible, depends on what oil you're running and condition of the motor, full load 70psi sounds ok.