teamvirus

idle system control malfunction?? what could be the problem...please help

Relic1

base idle not set right, TPS out of adjustment, vacuum leak, bad AICV, ECT bad.

teamvirus

what is AICV and ECT?

teamvirus

what should be my first steps in fixing it??

Relic1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teamvirus &raquo;</TD></TR><TR><TD CLASS="quote">what should be my first steps in fixing it??</TD></TR></TABLE>
in this order...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">base idle not set right, TPS out of adjustment, vacuum leak, bad AICV, ECT bad.</TD></TR></TABLE>
- verify your base idle is set correctly. short the Service Jumper that is under the passenger side of the dash. It's used to check for CELs. (see FAQ at top of this forum) Start car (CEL will be on) make sure your idle is ~800. If not adjust idle control screw on throttle body.
- take a volt meter with the ignition in run but the car not running and verify that you have .5 volts on the center wire on the TPS.
- With the car running, take some carb cleaner and spray it around the vacuum hoses, if the idle changes you know the area that the vacuum leak is.
- AICV = Air idle control valve, fastened to the rear of the intake manifold. It's that the ECU uses to set the idle when the intake butterfly is completely closed.
- ECT = engine coolant temp sensor. It detects the temperature... well I'm sure you can guess.

any of these will either directly or indirectly cause this CEL.
BTW this is covered very well in the Helm manual.

tuyoonly

i have a ls/vtec in a 96 hatch, i'm using stock harness, a friend that i knew did the swap for me and now i have to pass inspection, so i took my obd 1 ecu out and put a stock ecu in i have fixed all the other codes that the ecu had but i can't fix the p1509 code. (manufac vec.spd. idle control auxiliary circuit). i have a vixtor-x intake, 65mm edelbrock trottle body, holley fuel rail and preassure reg. i changed all of these and put si intake, throttle, fuel rail, regulator. but the car doesn't like to stay on when i put these stock parts. i put all my stuff back exept i put stock injectord but i cant seem to be able to clear the p1509 code. any ideas????

teamvirus

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">
in this order...

- verify your base idle is set correctly. short the Service Jumper that is under the passenger side of the dash. It's used to check for CELs. (see FAQ at top of this forum) Start car (CEL will be on) make sure your idle is ~800. If not adjust idle control screw on throttle body.
- take a volt meter with the ignition in run but the car not running and verify that you have .5 volts on the center wire on the TPS.
- With the car running, take some carb cleaner and spray it around the vacuum hoses, if the idle changes you know the area that the vacuum leak is.
- AICV = Air idle control valve, fastened to the rear of the intake manifold. It's that the ECU uses to set the idle when the intake butterfly is completely closed.
- ECT = engine coolant temp sensor. It detects the temperature... well I'm sure you can guess.

any of these will either directly or indirectly cause this CEL.
BTW this is covered very well in the Helm manual. </TD></TR></TABLE>


thanks so much for the info!!!

teamvirus

when i start the car its fine...but after about 15 min of driving the motor vibrates all funny around 3k rmps when accelerating...then after 30 min of driving..the check engine light comes on and its vibrates bad and bogs..

ok so then i check the light, it says code 505, so i reset the ecu, and it drives fine again....and so on


thanks

Relic1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teamvirus &raquo;</TD></TR><TR><TD CLASS="quote">
when i start the car its fine...but after about 15 min of driving the motor vibrates all funny around 3k rmps when accelerating...then after 30 min of driving..the check engine light comes on and its vibrates bad and bogs..

ok so then i check the light, it says code 505, so i reset the ecu, and it drives fine again....and so on


thanks </TD></TR></TABLE>
which car?
which engine?
which ECU?

teamvirus

ok so i just got a new code today

P0500 Vehicle Speed Sensor (VSS) Circuit Malfunction

now my gauge cluster went out

ok its a 99 civic si, stock ecu

teamvirus

bump

teamvirus

bump

Relic1

have you checked the engine grounds?

teamvirus

ok so the 500 check is all good, but i changed the AICV, but it didnt change anything

i start car and it drives great untill its been running for about 15-20 min, then the code will show and if i step on the gas, the car will bog alot. so i pull over and check the codes, and its 505, so i un plug the ecu and plug it back in, and it clears the code and drives great again.

i also used the carb cleaner and sprayed on the hoses and such, but i dont think i have a vacume leak.

also when i start the car idles its at around 2k and drops slowly down to 1k. but if i rev it to say 3k then the rpm will drop to 1k and back up to around 1.5k


PLEASE HELP ME!!!

JDM_Ej

Damn I wish I could help you here. Thats an annoying problem.

Have you scanned the code? I mean with a OBDII scanner? It should tell you more info than just the code your throwing.

I recommend verifying all engine grounds are free of corrosion and are secure first.

teamvirus

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_Ej &raquo;</TD></TR><TR><TD CLASS="quote">Damn I wish I could help you here. Thats an annoying problem.

Have you scanned the code? I mean with a OBDII scanner? It should tell you more info than just the code your throwing.

I recommend verifying all engine grounds are free of corrosion and are secure first.</TD></TR></TABLE>

its like a 100$ scanner but it just tells me the code!!

teamvirus

bump

teamvirus

BUMP

teamvirus

up

teamvirus

bumo

teamvirus

ok so i changed the ECT sensor...still same problem

teamvirus

bump cause i need to smog soon!!

teamvirus

bumps

teamvirus

bump

84dime

I have the same problem. Did you ever figure it out?