Fuel pump/ starter issue

[Finley95gst]

Ok I'm finally trying to start my car after a very long build. First off, I turn the key to try and start it and all I hear is my fuel pump humming. The starter relay doesn't click but I checked to see if it's getting power and it does. So I changed the relay out and still same thing, not clicking but the fuel pump still humms. I thought the fuel pump was only supposed to turn on while motor is cranking, because i jumped the starter to crank the engine and the fuel pump doesn't turn on while cranking. Also I'm not getting any spark as well. I followed the steps in the "no start" thread but I just can't figure it out. Checked my cas and cps and swapped them both out. Checked the ecu it's fine even used my buddies to make sure. Any suggestions?

 

[Finley95gst]

If your talking about both of the red/black wires then yea both of them get power. As for the fuel pump it doesn't prime while in the on position only while the cas sees that the crank is turning.

 

[Geier]

Does the engine turn over at all? This is the first step.

 

[Finley95gst]

Yes but only if I jump the starter using a wire, it won't start by the ignition.

 

[boost97gst]

On a 2gb turbo the key on does not prime the pump. You have to have CPS/CAS signals i believe. On NA's that happens, not turbos. Not mine atleast....

You may have some funky wiring. Previous owner type stuff going on

That said, i dont know about 2ga's, could be totally wrong.

 

[mattiouti]

First step would be to find out why you aren't getting 12v to the starter solenoid. You would need to pull out a wiring diagram work your way through until you find if there is an open in the wire/wires.

 

[miguelmcv]

I'm agree with mattiouti, you have to find out why you are getting power to the fuel pump when the car is not cranking.

Looks like some one rewired the pump (maybe), Check what's going on with your pump, if you have your car apart, remove or disconnect the MPI relay and give a try to see if your pump still works when the ignition is on, If it does turn on with out the MPI, then your pump is not connected to the MPI relay, so you have to start with that.
On this situation, you have to step by step, so your first step is to find out what's going on with your fuel pump, Also another step is your starter, if it doesn't crank you have to check if your MPI brings out the current, also check the clutch safety switch, it might be bad or some sore of.

 

[Eagle96TalonTSi]

Sounds like your fuel pump was rewired. Bust out your FSM and look at the wiring diagram for it and wire it back to factory spec. Should take you about 5 minutes. After your wiring is all back to 0 on the fuel pump, then figure out why youre not getting 12v to your starter. Have you tested your battery? Should be 12.5Vish, if not, try a different battery. You did say you got it to start by jumping it correct?

 

[mattiouti]

I think he was referring to jumping the starter. Not the car. Which means the starter is good. If the relay is good. Then there are two paths you have to check. (Mind you I don't have a wiring diagram to help at this moment). Check the relay coil ground to make sure the relay is actually kicking on. If all is good there then there is only one path. That's the wiring headed to the starter. While turning the key to start you should have 12v all the way from the relay to the starter. Start your process of elimination with back probing connectors for power while in the start position. It sounds confusing and kin of hard to explain.

 

[Finley95gst]

yes i was reffering to the starter being jumped not the car. As for the starter relay im pretty sure it works even if it isnt clicking because when i unplug it the fuel pump wont humm like that but when i plug it back in it does. i checked the clutch safety switch and its working as well. I even tried bypassing it and just using the red/black and black/yellow wired to see if that would work but it does the same thing makes the fuel pump humm. And ill have to check the wiring on the fuel pump tomorrow been a long day . Thanks for the replies

 

[mattiouti]

I would pull out a dmm or test light on that circuit just to make sure. It's the only sure way

 

[Finley95gst]

Which circuit are you refering too?

 

[Finley95gst]

Well I checked my fuel pump wiring and it looks fine. Traced the wires all the way to the fuse box and everything looks fine. I'm clueless. It almost seems like the fuel pump and starter are mixed somehow because when u turn the key to start the fuel pump kicks on when the starter should be so idk anymore thoughts?

 

[miguelmcv]

Actually, that's how it works, when you turn to the start point, it triggers the starter, once the starter turns the engine, the fuel pump triggers by seeing cranking signal, however, the good point here is that the fuel pump is working, so saying that, check why your starter is not working, check the MPI relay, when you turn to the start position check if there is current coming out from the MPI relay, if there is non then check at the switch to see if the switch is bad, If you do see current coming out of the MPI relay, then your problem is the line that goes from the MPI relay to the starter, or the starter.

Check that and report back.

 

[Finley95gst]

ok i have fuel now and my ingnition is cranking the car. Now all i need is spark. Im getting power to the coil pack plug but not the spark plug. any thoughts?

 

[miguelmcv]

If you have power to the coil and don't have spark, then your coils are bad, replace them and you should be OK, hopefully it will start once your replace the coil.

 

[Finley95gst]

im using a cop not the stock coil setup. gnna try and rewire it hopefully thts the problem

 

[miguelmcv]

Ho, I see, then let us know how it end up, Don't forget to use the right diagram for the right set up, 1g cas and early 2gs are different.

 

[Finley95gst]

Ok, I looked at the chart but don't know if I did it right. If I have a 95 ecu and 95 cas, do I wire it inverted or not?

 

[miguelmcv]

NO, if you are using stock sensors (2g cam and crank sensor), you don't need to inverted.
If you are using a 1g CAS, then you have to inverted.

 

[brobo]

Id bet my money on the starter relay

 

[Finley95gst]

No the relay is fine. I got it wired up but it was late so didn't get a chance to test it. Pretty sure it should work now I hope . Thanks for sticking with me this long. Gnna try it either tonight or tomorrow. Ill let you know what happens