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The Ethereal
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PostPosted: Sat Mar 26, 2005 2:38 pm 
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Most efi cars fuel pump turns on when you turn the key to "run".
Mitsus don't.

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Flying Eagle
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PostPosted: Sat Mar 26, 2005 8:13 pm 
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Exactly what The Ethereal said, you put the key to start/crank with the pressure fuel line connected to a 2L pop bottle and you'll see exactly what we are talking about, did this to diagnose a pesky ECU situation where the injector drivers went and I didn't want to oversaturate the plugs anymore.


Last edited by Flying Eagle on Mon Apr 18, 2005 8:26 pm, edited 1 time in total.

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Boostin
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PostPosted: Mon Apr 18, 2005 6:25 pm 
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Still can not figure out ths damn car !!!! I hokked the fuel pump up with the wire under th hood and let it run for about 10 seconds then tried to start the car. Still did not want to start. What is wrong with my car?

I just want it to be able to start!!!


GRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR

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talontsi-old
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PostPosted: Mon Apr 18, 2005 7:21 pm 
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My sonata (4g64) had the exact same symptoms. It ended up being the fuel pump.

I would let the car sit after a run and she would fire right up.
You could install a FPR gauge to see if it is definilty causing the problem or swap out to a cheap stocker.

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FatBastard
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PostPosted: Tue Apr 19, 2005 3:00 am 
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Location: Edmonton or Calgary, Alberta, Canada
If you want to try a new fuel pump, I have 2 stock turbo DSM pumps here sitting on the shelf, and I'm only 10 mins away :-)

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ColtMax
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PostPosted: Thu Apr 21, 2005 8:12 pm 
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Quote:
Quote:

I cycle the key to run about 10 times then the car starts way better.
Most efi cars fuel pump turns on when you turn the key to "run". Try turning it to "run" and leaving it there for 5-10 seconds before starting. My guess is that the pump is dying.
DSM's dont.
The pump is actionned on start, and will continu when engine is turning.

Did you check your grounds.

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Flying Eagle
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PostPosted: Thu Apr 21, 2005 8:21 pm 
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ColtMax has a good point on that, me don't think of the obvious reason why an electrical circuit may not be making full time contact for power/ground.
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sleeper
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PostPosted: Fri Apr 22, 2005 1:50 pm 
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Hey mike I feel your pain. have no fear buddy im 99% sure I can fix you up I had the exact same problem . Call me at work you got my number.
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Red Sleeper
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PostPosted: Fri Apr 22, 2005 3:20 pm 
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both my colt and my dsm do the same thing..

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netninja2001
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PostPosted: Fri Apr 22, 2005 3:48 pm 
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i thought the pump starts when the key is in the "Run" position.... if you follow the "Start" logic, then the fuel pump cuts back off when the key returns to "Run" which just doesn't make sense...
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Flying Eagle
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PostPosted: Fri Apr 22, 2005 9:02 pm 
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ECU senses/controls the engine running now and triggers the ground to the fuel pump relay to stay on. Start function and run function of the fuel pump are the same grounding technique/function internal to the ECU but it will choose to keep it on or turn it off, based on what it is sensing about the engine catching and running continous.
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colt-r-old
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PostPosted: Sat Apr 23, 2005 1:30 pm 
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The only reason you hear the fuel pump when you turn the key is because it's pressurizing the system.
Have you logged at the car when it's off?
My Colt wouldn't idle for the longest time and mad an occaisional mis fire, the logger showed the TPS was toast, even with the car off i could tell.

Throw it on a logger, it never hurts.

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