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Old 08-01-2012, 01:20 PM   #1
chewbakarox
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Join Date: Oct 2002
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2003 WRX Sport Wagon
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Default 03 WRX Cranks But Won't Start!

I have an '03 WRX with about 95,000 miles. Basic Stage 2 mods include UP, DP, intake, catback and Protune. It has been running perfectly for years when all of the sudden it wouldn't start this morning.

It cranks nicely so I don't think it's the battery or starter. But there is no other sound other than the starter (i.e., the engine doesn't even idle/stumble or anything). It just cranks and cranks and nothing happens. Driving home yesterday, I sensed something was off - the engine almost stalled once after letting off the accelerator but I didn't think much of it.

Again, I haven't modified anything in years so it's not a case of a faulty new part or incorrect installation. Can someone help me troubleshoot this and tell me what the most likely culprit is? How do I diagnose if this is a fuel issue, ignition issue, or otherwise? TIA.
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Old 08-01-2012, 02:43 PM   #2
Samurai Jack
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Pull the fuel line from the fuel filter under the hood.
Hold the line in a bucket and have someone try to start the car.
If no fuel, then it's your fuel pump.

If fuel, reconnect fuel line and try again after the filter.
If no fuel, then it's your fuel filter.

Repeat again after the fuel pressure regulator.

If all is good (fuel), then yiou are getting fuel to the fuel rails so not the fuel system. It is possible you have a clogged fuel rail, so you may have to disconnect the fuel rail and try one more time.

Check your electrical connections to all your igniters. I highly doubt all your igniters went bad at once.
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Old 08-01-2012, 03:41 PM   #3
chewbakarox
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Join Date: Oct 2002
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Location: I fart 15 psi.
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2003 WRX Sport Wagon
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Quote:
Originally Posted by Samurai Jack View Post
Pull the fuel line from the fuel filter under the hood.
Hold the line in a bucket and have someone try to start the car.
If no fuel, then it's your fuel pump.

If fuel, reconnect fuel line and try again after the filter.
If no fuel, then it's your fuel filter.

Repeat again after the fuel pressure regulator.

If all is good (fuel), then yiou are getting fuel to the fuel rails so not the fuel system. It is possible you have a clogged fuel rail, so you may have to disconnect the fuel rail and try one more time.

Check your electrical connections to all your igniters. I highly doubt all your igniters went bad at once.
Thank you much for the tip. Sounds like the fuel system is the most likely culprit. I will do some troubleshooting tonight and reply.
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Old 08-01-2012, 10:41 PM   #4
chewbakarox
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Join Date: Oct 2002
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2003 WRX Sport Wagon
PSM

Default

OK - I did a bit of troubleshooting. There is no fuel coming into the fuel filter. I also can no longer hear the fuel pump priming when I turn the key to the "on" position. So at least that narrows it down (I think?).

So now that the problem is focused on the fuel pump, do I assume I just need to replace the pump? Or could it be an electrical issue tied to the pump (like a relay or something)? TIA, the advice here is a lifesaver.
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Old 08-02-2012, 12:14 AM   #5
J.Gibbs
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Quote:
Originally Posted by chewbakarox
OK - I did a bit of troubleshooting. There is no fuel coming into the fuel filter. I also can no longer hear the fuel pump priming when I turn the key to the "on" position. So at least that narrows it down (I think?).

So now that the problem is focused on the fuel pump, do I assume I just need to replace the pump? Or could it be an electrical issue tied to the pump (like a relay or something)? TIA, the advice here is a lifesaver.
Easiest way to tell is test the various parts of the circuit with a multimeter
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Old 08-02-2012, 12:56 AM   #6
MarioAndretti
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The first place to start is check all your fuses both in the dash and under the hood.I would hate to see you replace a fuel pump and have it still not work.
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Old 08-02-2012, 01:30 AM   #7
chewbakarox
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Quote:
Originally Posted by MarioAndretti View Post
The first place to start is check all your fuses both in the dash and under the hood.I would hate to see you replace a fuel pump and have it still not work.
I checked fuse #11 in the dash (ignition) but from what I have gathered here in the forum, I don't believe there is a fuse for the fuel pump, only a relay. If I am mistaken, someone please let me know which fuse to check please!!
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Old 08-02-2012, 01:34 AM   #8
hybrid gti 2
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How about the clutch switch? Or does it not crank with a bad switch. Just a thought.
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Old 08-02-2012, 01:55 AM   #9
chewbakarox
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2003 WRX Sport Wagon
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Quote:
Originally Posted by hybrid gti 2 View Post
How about the clutch switch? Or does it not crank with a bad switch. Just a thought.
Yeah, it wouldn't even crank if there was a bad clutch switch. But thanks for the heads up!
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Old 08-02-2012, 02:20 AM   #10
chewbakarox
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Member#: 25478
Join Date: Oct 2002
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Location: I fart 15 psi.
Vehicle:
2003 WRX Sport Wagon
PSM

Default

Quote:
Originally Posted by J.Gibbs View Post
Easiest way to tell is test the various parts of the circuit with a multimeter
OK, I am going to check for power at various points of the circuit. I am a noob with a multimeter - can someone explain where to start and what setting to use on the multimeter? I figure I should start at the wiring harness to the FP and work my way towards the FP relay and ECU?
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Old 08-02-2012, 04:14 AM   #11
MarioAndretti
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red

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Quote:
Originally Posted by chewbakarox View Post
I checked fuse #11 in the dash (ignition) but from what I have gathered here in the forum, I don't believe there is a fuse for the fuel pump, only a relay. If I am mistaken, someone please let me know which fuse to check please!!
As a general rule everything electric in on a fused circuit somewhere in the system to prevent a fire or other damage in the event of a short.After a bit of searching I found that the large 30A fuse in the center row of the fuse box under the hood controls the fuel pump relay,main relay,engine control module and the data link connector.I believe it was SBF5.I have 3 such fuses in my 02 OBS(SBF5,6 and 8)and can be checked visually without removing them.
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Old 08-02-2012, 12:25 PM   #12
chewbakarox
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Join Date: Oct 2002
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Location: I fart 15 psi.
Vehicle:
2003 WRX Sport Wagon
PSM

Default

Quote:
Originally Posted by MarioAndretti View Post
As a general rule everything electric in on a fused circuit somewhere in the system to prevent a fire or other damage in the event of a short.After a bit of searching I found that the large 30A fuse in the center row of the fuse box under the hood controls the fuel pump relay,main relay,engine control module and the data link connector.I believe it was SBF5.I have 3 such fuses in my 02 OBS(SBF5,6 and 8)and can be checked visually without removing them.
Hi Mario, I also was able to find this info and checked the SBF5 fuse last night. It was fine, so I think I can rule out a blown fuse as the culprit.
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Old 08-03-2012, 02:44 AM   #13
chewbakarox
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Vehicle:
2003 WRX Sport Wagon
PSM

Default

OK, did some digging tonight and got some weird results. Checked for power at the fuel pump harness, got nothing. Checked for power at the fuel pump controller harness, got nothing. Moved on to the fuel pump relay.......

I have 12V constant at pin #2. When turning the key 2 clicks to "on", I get about 1 volt at pin #1. So the ECM is sending something to the relay, but it is only 1 volt.....WTF? Does anyone know what this means? Please help!!
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