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1997 Subaru Legacy - starts but immediately dies after IACV service
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twainband
Novice
Apr 1, 2022, 8:04 AM
Post #1 of 11
(2638 views)
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1997 Subaru Legacy - starts but immediately dies after IACV service
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Hello
Yesterday: I pulled the IACV on my '97 Subaru Legacy in an attempt to solve a P0505. I cleaned and bench-tested the valve and it seemed to be operating just fine. I put everything back together, replacing a small bit of broken air hose that i discovered in the process. Have tripple checked that all harnesses were reconnected properly, giving them a clean with contact cleaner before hand.
Now: When i attempt to start the car, it fires up immediately (one problem i was chasing was a hard cold start, always took multiple tries). Engine runs at normal idle for a few seconds then steadily dies. When i give it gas to attempt to sustain the idle, it dies just the same but the engine shudders in a not so nice way.
My bluetooth OBDII reader, which was working fine before, is unable to connect to the car (probably because it is not running) so I don't have new codes... Since it's firing up, my feeling is it's probably a vacuum/air issue.. but what could have happened between the IACV test to cause this problem ?
I'm really up the creek here, if anyone could help me with suggestions or a test protocol, i would be really grateful ! don't have to drive to work til Tues but i'm anxious to get it running
thanks kindly
mat
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 1, 2022, 8:11 AM
Post #2 of 11
(2636 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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Have you taken a reading on the fuel pressure?
Here is the spec
Fuel Pressure
With Regulator Disconnected .................... 34-38 psi (235-265 kPa)
With Regulator Connected .................... 26-30 psi (177-206 kPa)
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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twainband
Novice
Apr 1, 2022, 8:15 AM
Post #3 of 11
(2633 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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I haven't. Will do and post here
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twainband
Novice
Apr 1, 2022, 10:01 AM
Post #4 of 11
(2621 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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ok. connected the fuel pressure meter between the filter and the fuel rail. i'm getting a reading of 30psi while the engine runs. when it dies, the meters briefly peaks at 40psi then drops to zero.
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 1, 2022, 1:04 PM
Post #5 of 11
(2610 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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Those are good pressures so we can eliminate the fuel supply system.
If your code reader stopped working, then you need to test all the fuses with a test light.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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twainband
Novice
Apr 1, 2022, 6:56 PM
Post #6 of 11
(2597 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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Thanks so much for the speedy responses HT
I tested all fuses and they all passed.
While i was in there, checked the resistance of the ignition coil and the IACV... both read slightly higher than spec, but just like .3 ohm.
I'm wondering: is the gap in the IACV the culprit ? admitting too much O2? when it's "closed", there is still a 1/2" opening. I discovered that this can be adjusted by loosening the top screws and twisting the valve assembly in the housing... but i wasn't sure what the ideal spacing was so i just put it back the way I found it.. this car had been struggling to start in the mornings (usually took two or three tries) and very occasionally would stall out when down shifting (it's an automatic...).
thanks again for giving this your time... cheers m
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 1, 2022, 7:05 PM
Post #7 of 11
(2594 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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Those IACs are not supposed to be adjusted.
Have you messed with the throttle plate adjustments?
My understanding is you have not tried another IAC, why not?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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twainband
Novice
Apr 2, 2022, 7:50 AM
Post #8 of 11
(2556 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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I haven't tweaked the throttle plate yet... don't have any experience there. Any guidelines for how to go about that ?
I haven't tested a new IACV yet - it's a $200 part and mine appears to be funcioning correctly, according to voltage and bench test..
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 2, 2022, 8:37 AM
Post #9 of 11
(2548 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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Just an "Out of the box thought/thing" is this seems to just shut off - right?
Try something: If you get it to stay running holding gas pedal or it does sometimes jiggle the key not really turn it but up + down then try to pull it out it shouldn't come out in "run" position ever. If that causes it to happen there's a problem there not so likely but the fight with this uncertain it's the funky things that are real tough would be ignition something + change direction this goes?
T
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twainband
Novice
Apr 2, 2022, 9:28 AM
Post #10 of 11
(2545 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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ooookk
i figured it out.
pretty embarrassing;
IVAC intake hose was disconnected at the main intake
not used to this setup and didn't catch it
sorry for wastin yalls time
thanks for the help
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 2, 2022, 11:28 AM
Post #11 of 11
(2539 views)
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Re: 1997 Subaru Legacy - starts but immediately dies after IACV service
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We all make oooops things no problem + glad you found it and it's fixed.
Closed out at solved ask either of us we can re-open it,
Tom
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