car wont turn over.

[xTSPx801x]

so i just got done with a h23 manifold swap, put my car back together and she wouldnt start. my fuel pump wont even turn on. we thought it was my main relay, because he took some wire and jumped it and the fuel pump started working.. well i just replaced the main relay and it still wont start. help would be much appreciated.

[BurtonRiderT6]

I hear positive reinforcement works best for getting the old dog to learn new tricks. Try giving it a treat.

Check fuses? Spark? Grounds?

[cloudasc]

Check your grounds, especially the one on the thermostat.

Is it a fuel related problem or spark related problem?

A quick test is to spray some starting fluid/ether into the intake manifold, and try and start the car up, if it starts and dies quickly, its a fuel issue, if it just cranks and cranks and cranks, its most likely a spark issue.

[browncali]

check your grounds

[xTSPx801x]

checked the fuses, the grounds, and i have a lot of spark.
which probably means its a fuel system problem.
but my fuel pump is brand new so it shouldnt be that.

[xTSPx801x]

my friend thought we shorted out the main relay somehow, so maybe if it did it shorted out something else that controls the fuel system?

[oyajicool]

Make sure there is power coming to the pump through newly installed main relay.

[cloudasc]

The ecu is the "brain" of everything, what were you doing to "short out" something?

[xTSPx801x]

Make sure there is power coming to the pump through newly installed main relay.

how would I go about that?

[xTSPx801x]

The ecu is the "brain" of everything, what were you doing to "short out" something?

well we unplugged the sending unit or the pump itself so we could roll my windows up and continue the next day. he thinks that might of shorted something somehow?

[guam671]

Check if your 10a is blown. Or check all your fuses if something shorted it would blow a fuse and narrow your issue.

[oyajicool]

how would I go about that?

It seems like your friend knows which wire is for fuel pump power. If you don't know how to go about checking the functionality of the pump, it is best to leave it to your friend.

In any case, you'll need a multimeter to do this test. Or, test wires with 12v light bulb.

[xTSPx801x]

update. fuel pump is turning on, sending fuel to my fuel rail, i have a lot of spark, and it crank over sputter, then die.
any ideas?

[BurtonRiderT6]

update. fuel pump is turning on, sending fuel to my fuel rail, i have a lot of spark, and it crank over sputter, then die.
any ideas?

So its trying to start or it starts, rough idles for a few seconds and dies? Did you by chance mess with any timing components?

[oyajicool]

Yeah, check plug wires for correct firing order.