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Old 06-23-2018, 02:14 PM   #1
spiralsmurf
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Default STi not starting. Fuel pump and starter donít run

My 05 Sti recently developed an issue most often when itís hot out (now) and I just drove for a while. Iíll park, go inside a store and then it wonít start for a couple minutes. So far it has always started after a few minutes but I need to fix this obviously.

Battery is good, when the key is turned to crank the fuel pump doesnít run at all and the starter doesnít crank. The only thing that happens is the starter solenoid engages.

Any idea where to look for an issue?
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Old 06-23-2018, 03:33 PM   #2
Charlie-III
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If you get a "start signal" to the starter when twisting the key to start (battery voltage to the small wire in the starter), then you have a starter issue.
A 13yo starter may have failed, many ways to resolve it.

How do you know the FP is not running? No noise when key is "on"?

If it's won't crank, of course it won't start.

One thing at a time.

Report back.
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Old 06-23-2018, 04:00 PM   #3
spiralsmurf
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The starter doesnít crank when this condition is happening but I hear the solenoid clicking, but when it works it cranks like normal. I know the fuel pump doesnít run because I donít hear it in the car like usual (Dw200). It would seem like something which controls power to both fuel pump and starter is the cause of the problem?
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Old 06-23-2018, 06:24 PM   #4
Charlie-III
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Totally sounds like either a battery issue, battery connection.....last is ignition switch electrical issue.

If battery or connection, do electrical things go dead when trying to crank?
If so, there ya go.......

Option is, when it won't crank, safe is measure battery voltage to the signal wire to the starter. Should be there when trying to crank.
Got it? Starter issue. Fix/replace.
Don't got it? Ignition switch electrical issue is most likely.
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Old 06-23-2018, 06:27 PM   #5
Charlie-III
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BTW, this should be in electrical at a minimum.......not 2.5L FI specific......
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Old 06-23-2018, 06:34 PM   #6
Valarius Starchaser
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check your ground to the bellhousing bolt holding on the starter as well as the batt positive to the starter solenoid

could just be some corrosion good to start cheap rather then throw a starter at it for no reason
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Old 06-23-2018, 08:28 PM   #7
spiralsmurf
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Quote:
Originally Posted by Charlie-III View Post
Totally sounds like either a battery issue, battery connection.....last is ignition switch electrical issue.

If battery or connection, do electrical things go dead when trying to crank?
If so, there ya go.......

Option is, when it won't crank, safe is measure battery voltage to the signal wire to the starter. Should be there when trying to crank.
Got it? Starter issue. Fix/replace.
Don't got it? Ignition switch electrical issue is most likely.
Nothing goes dead when the condition arises. Radio, cig lighter, fans etc. probably the ignition switch because I hear the solenoid everyone I try to start it. Sorry for posting in the wrong place and thanks for your help.
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Old 06-23-2018, 08:33 PM   #8
mikeh05wagon
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The first step for me if this was in my bay would be to obviously test battery check terminals blah blah blah. Pull codes. You may have a pending code or a stored code thatís not throwing a light.
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Old 06-23-2018, 08:58 PM   #9
Charlie-III
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Quote:
Originally Posted by spiralsmurf View Post
Nothing goes dead when the condition arises. Radio, cig lighter, fans etc. probably the ignition switch because I hear the solenoid everyone I try to start it. Sorry for posting in the wrong place and thanks for your help.
If you feel up to it, turn the ignition key to run. Then, jump between the big power feed to the starter and the small signal wire to the starter (make sure it's in neutral or park since you are bypassing safeties!!!!).
Does it crank?
Yes, either ignition or a trans safety.
No, then starter.

Report back.
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Old 06-23-2018, 09:03 PM   #10
spiralsmurf
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Quote:
Originally Posted by Charlie-III View Post
If you feel up to it, turn the ignition key to run. Then, jump between the big power feed to the starter and the small signal wire to the starter (make sure it's in neutral or park since you are bypassing safeties!!!!).
Does it crank?
Yes, either ignition or a trans safety.
No, then starter.

Report back.
Trans safety is that the switch on the clutch pedal?
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Old 06-24-2018, 11:11 AM   #11
Charlie-III
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Quote:
Originally Posted by spiralsmurf View Post
Trans safety is that the switch on the clutch pedal?
For a MT?, yes. I believe it is a "NO" (normally open) so a jumper on the harness side can mimic pushing the clutch pedal down.
Since you are supplying power from the heavy positive wire direct to the starter signal wire, you are bypassing all interlock safeties.
So if it cranks and starts in gear, the car moves.
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