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Old 08-03-2007, 11:58 PM   #1
Scooby Guru
Member#: 9960
Join Date: Sep 2001
Location: in bed...
2002 Impreza WRX
WRBlue Perl

Default Symptoms of a defective ignition/fuel pump relay?

Ok, here are a few things i experienced with the car today and am not sure as to whether the ignition relay or similar would be the culprit here:

Cruising at 60mph for 2 hrs, and car loses forward drive... revs begin to drop, and increased throttle input doesn't raise the revs. Car loses speed. Prodding the throttle results in a delayed reaction by the engine. No smoke or anything unusual from the tail pipe while all of this is happening.

Fuel pump (external) sounds louder than usual, almost as it does when the engine is about to stop when you run out of gas..either that or its being strangled for power...(but there is a full tank of gas)

When the car comes to a halt on the side of the road, the CEL light and the usual dash lights are on (same ones as come on when you turn the key to the ON position), so the ECU (Hydra) seems to be getting power

Turn the key OFF and then turn back to the ON position (in an attempt to prime the system ready for a re-start attempt) and the following happens:

The fuel pump primes VERY lazily as if there is no battery power for the first second or two and then increases in vigor slightly after (but there is a full 12 volts according to my volt meter and Hydra datalogger software).

Windows do not work for the first 1-2 secs after the key has been turned to the ON position (during this time here the pump is lazily priming the system also) After this interval, the windows repsond to the window switches, and the pump completes its priming of the system with a tad more vigor.

Following time to prime the system, engine turns over with vigor like usual, tries to fire, and fuel pump is whining as if there is insufficient power to it or gas (but there is a full tank of gas) to feed the engine.

After sitting on the side of the road for 15mins, I turn the key to the ON position, and dash lights come on as usual, Fuel pump primes with vigor (like it should), and engine fires up like nothing ever happened. Car revs like usual and the fuel pump sounds good and hearty as usual.

Drive for a little while longer, and the car starts to lose power again, and comes to a halt. Before it all starts, i can hear the fuel pump (external) working a little louder than usual. soon after the revs start to drop and you know the rest...It got to a point today that when i heard the pump starting to get loud, I would quickly pull over to the hard shoulder in preparation for the car to shut itself down..and it would too...

What are the symptoms of a dying relay?
Do relays get hot or something when going bad?
Any ideas?
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Old 08-04-2007, 02:26 PM   #2
Scooby Guru
Member#: 9960
Join Date: Sep 2001
Location: in bed...
2002 Impreza WRX
WRBlue Perl


bump for any suggestions guys...
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Old 08-08-2007, 02:37 AM   #3
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Member#: 99139
Join Date: Oct 2005
Chapter/Region: BAIC
Location: clovis,ca
02 wrx


could be bad alternator.since lots of systems are failing it seems to be a total electrical failure which is usualy shorted battery or bad alternator.
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Old 08-08-2007, 12:01 PM   #4
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Chapter/Region: Tri-State
Location: brokenmotorsports.com
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get your starting and charging system checked first.
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Old 08-10-2007, 10:57 AM   #5
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Member#: 133630
Join Date: Nov 2006

99% fuel pump.

I have had the issue with three different vehicles in the past.

After race weekends the left over race fuel was put into the gas tank.

It kills the fuel pumps.

The reason the car starts after 15 minutes is due to the pump cooling off.

There is no fix, except replacing it.
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Old 07-11-2009, 06:36 PM   #6
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Member#: 144772
Join Date: Mar 2007
2002 WRX Wagon


finally what happened? was it the pump?
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