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rafapr88
03-07-2011, 04:37 PM
hey i'm kinda sorta new to the subby community, just got a bd GT and its pretty good sometimes i got this problem when the motor will idle low and then shuts off when u start it it sounds like a lawnmower and it throws the CEL the code is p1507 and its for the IACV w.e its spelled i cleaned the one that was there it didnt fix the problem so then, my friend let me have his extra one and the car was good for a day or two and it started again, maybe some1 else here had that problem and could brighten up my thoughts on how to fix it i thought maybe its has some hoses leaking air or the gasket on the throttle body idk anymore but thanks in advance

car has 186k on motor, and thats the only code thats there right now besides the fact that my speedometer isnt workin either but thats a p0500.

so i replace the gasket on the iacv and it kept acting up and i was about to go get a neutral switch and i realized i didnt check the pcv valve thing on the top left of the manifold, my friend took the one of his manifold so i could test it on the car and it stopped shutting off, but then what happened was, the idle was completly off this shit was idling at 100 or 200 and it stalled itself pretty much, so i messed with the TPS a bit and adjusted the iacv, i had my girlfriend watch the tach so i could get the car to idle at 900 i got it there took it for a spin and it was fine not shutting off, drove it home (40 minute drive) and it was fine at one point it idled at 2.500 way too high lol so i shut it off waited a bit and turned it back on and it was fine again, only problem is now the car feels like its spluttering a bit in low rpms, almost like a turbo car with a boost leak, like it resitate and then once i get to 2700 or 3000 rpms its all okay.....plz help idk what that could be, i replaced the spark plugs last week and i replace the coil tonite, i dont think its misfiring but i still gotta do the cables. and its not throwing any codes

chuckthefuk
03-07-2011, 07:34 PM
3 things have been used to fix this....
From "paintbing - nasioc"

1 - Cleaning the IACV
2 - Replacing the Neutral Switch
3 - Loosening your throttle cable from being too tight - ie piano string - hitting High 'C'.

We loosened the throttle cable as the plate wasn't 100% closed when in idle. The ecu couldn't prevent the high idle once it was warm and threw this code and gave it a cough/rough idle.

(#3 is why both I had this code pop up a year ago and the reason my friends did it today.)

Good luck!


Technical IACV diag:

(this for '00obw AT):
11CN1: CHECK ANY OTHER DTC ON DISPLAY
CHECK: Does the Subaru Select Monitor or OBD-II general scan tool indicate DTC P1510, P1511, P1512, P1513, P1514, P1515, P1516 or P1517?
YES: Inspect DTC P1510, P1511, P1512, P1513, P1514, P1515, P1516 or P1517 using "11. Diagnostics Chart with Trouble Code for AT Vehicles".
NOTE: In this case, it is not necessary to inspect DTC P0507.
NO: Go to step 11CN2 .

11CN2: CHECK AIR INTAKE SYSTEM.
Turn ignition switch to ON. Start engine, and idle it. Check the following items.
Loose installation of intake manifold, idle air control solenoid valve and throttle body
Cracks of intake manifold gasket, idle air control solenoid valve gasket and throttle body gasket
Disconnections of vacuum hoses
CHECK: Is there a fault in air intake system?
YES: Repair air suction and leaks.
NO: Go to step 11CN3 .

11CN3: CHECK THROTTLE CABLE.
CHECK: Does throttle cable have play for adjustment?
YES: Go to step 11CN4 .
NO: Adjust throttle cable.

11CN4: CHECK AIR BY-PASS LINE.
Turn ignition switch to OFF. Remove idle air control solenoid valve from throttle body. Confirm that there are no foreign particles in by-pass air line.
CHECK: Are foreign particles in by-pass air line?
YES: Remove foreign particles from by-pass air line.
NO: Replace idle air control solenoid valve.

rafapr88
03-07-2011, 09:57 PM
3 things have been used to fix this....
From "paintbing - nasioc"

1 - Cleaning the IACV
2 - Replacing the Neutral Switch
3 - Loosening your throttle cable from being too tight - ie piano string - hitting High 'C'.

We loosened the throttle cable as the plate wasn't 100% closed when in idle. The ecu couldn't prevent the high idle once it was warm and threw this code and gave it a cough/rough idle.

(#3 is why both I had this code pop up a year ago and the reason my friends did it today.)

Good luck!


Technical IACV diag:

(this for '00obw AT):
11CN1: CHECK ANY OTHER DTC ON DISPLAY
CHECK: Does the Subaru Select Monitor or OBD-II general scan tool indicate DTC P1510, P1511, P1512, P1513, P1514, P1515, P1516 or P1517?
YES: Inspect DTC P1510, P1511, P1512, P1513, P1514, P1515, P1516 or P1517 using "11. Diagnostics Chart with Trouble Code for AT Vehicles".
NOTE: In this case, it is not necessary to inspect DTC P0507.
NO: Go to step 11CN2 .

11CN2: CHECK AIR INTAKE SYSTEM.
Turn ignition switch to ON. Start engine, and idle it. Check the following items.
Loose installation of intake manifold, idle air control solenoid valve and throttle body
Cracks of intake manifold gasket, idle air control solenoid valve gasket and throttle body gasket
Disconnections of vacuum hoses
CHECK: Is there a fault in air intake system?
YES: Repair air suction and leaks.
NO: Go to step 11CN3 .

11CN3: CHECK THROTTLE CABLE.
CHECK: Does throttle cable have play for adjustment?
YES: Go to step 11CN4 .
NO: Adjust throttle cable.

11CN4: CHECK AIR BY-PASS LINE.
Turn ignition switch to OFF. Remove idle air control solenoid valve from throttle body. Confirm that there are no foreign particles in by-pass air line.
CHECK: Are foreign particles in by-pass air line?
YES: Remove foreign particles from by-pass air line.
NO: Replace idle air control solenoid valve.
wow bro this information was very helpful i already cleaned and then replace the iacv and its still doing it i did check for vaccum leaks and bad hoses on intake i will do the throttle cable adjustment tomorrow and if that doesnt work then i'll go for the neutral switch
but once again thanks alot for the help

chuckthefuk
03-07-2011, 10:01 PM
:-D No problem always happy to help and welcome to SLi.

-Chuck

rafapr88
03-07-2011, 10:16 PM
:-D No problem always happy to help and welcome to SLi.

-Chuck
thanks man, i'ma be here for a while, i'm loving the subby very fun to drive and the community is real cool too, not like honda assholes lol

i'm Vin