P0508??????

[909Sxt]

Well I was geting ready to head home today when I came to a stop sign and tryed to go and my car woudn't budge. I looked at my dash and it had the oil light on, I checked to see if my car was started and it wasn't so I pulled off on the side of the road and tryed to start it again and it cranked. Figuring that it was just a fluke or maybe I stalled I took off again and by the time I came to the traffic light to slow down my car cut off on me again. So by the time I was like WTF, well I did the diagnosis code thing (turned the engine key off and on 3 times) and it showed that I was throwing codes p0234 and P0508. Now the P0234 I could understand because Im spiking 18 and droping until redline on my car but the P0508 was new to me. I did a check on the forums to see if I could find the code but didn't see shit. Does anyone know what the F$#% is going on?

[BACARDI_DWB]

did you check your oil? what did it look like?

[phantompablo]

Don't know if it helps but here is the meaning of that code...

P0508-IAC VALVE SENSE CIRCUIT LOW

[BACARDI_DWB]

P0508-iac Valve Sense Circuit Low

[BACARDI_DWB]

almost sounds like a vacuume(sp) leak

[909Sxt]

Quote: Originally Posted by BACARDI_DWB

did you check your oil? what did it look like?

I checked it, it was full, whats the IAC?

[BACARDI_DWB]

?? if i had to guess i would say intake air controll the search on the forums is not working right now for me

[BACARDI_DWB]

i really don't think its cause of the over boost cause i boost 24psi of boost and i have not had any codes like that.

[RevolRapom]

make sure the rubber hose connecting to the throttle body(after the throttle plate) didn't blow off from the boost pressures. does sound like a vacuum issue and if i was a betting man i would say you haven't zip-tied all of the hoses/lines.....

[BACARDI_DWB]

i would guess that if your oil light came on and its a vaccume problem i would check the lines going to and from your head. make sure they don't have any cracks. ?

[phantompablo]

IAC=Idle Air Control valve

If it's bad or your computer isn't reading it/interpreting it correctly your car won't idle for shit if at all

[phantompablo]

Okay...just got off the phone with my dad. He owns an autoshop in the Bay Area and has been a master technician since the flinstones. This is what he told me when I described your problem and the code you are getting.

Look for:

something that may strip or pull a wire out of a connecter. start at idle control and move back to computer. more than likely not idle control itself. look for a wire chaffed and grounding inside a bracket which would pull the circuit low. look close at wiring at any brackets. not gonna be easy to see. bright lights and mirrors. if you've ever had a broken motor mount it could have made wires move around which may have caused chaffing. pay close attention to exposed wires mostly, dont worry too much about wires inside conduit. he says more than likely if it was a broken wire the circuit voltage would have been high not low and more than likely the same if the sensor was bad. this is cause it wouldn't be completing the circuit instead of just causing a drain on it like an exposed wire.

[909Sxt]

Quote: Originally Posted by phantompablo

Okay...just got off the phone with my dad. He owns an autoshop in the Bay Area and has been a master technician since the flinstones. This is what he told me when I described your problem and the code you are getting.

Look for:

something that may strip or pull a wire out of a connecter. start at idle control and move back to computer. more than likely not idle control itself. look for a wire chaffed and grounding inside a bracket which would pull the circuit low. look close at wiring at any brackets. not gonna be easy to see. bright lights and mirrors. if you've ever had a broken motor mount it could have made wires move around which may have caused chaffing. pay close attention to exposed wires mostly, dont worry too much about wires inside conduit. he says more than likely if it was a broken wire the circuit voltage would have been high not low and more than likely the same if the sensor was bad. this is cause it wouldn't be completing the circuit instead of just causing a drain on it like an exposed wire.

Cool I'm going to check tomarrow, phantom thanx. if all else fails it seems like something the factory should warrant hopfully. until then I'll just reset my pcm

[RACESRTX]

I think it's Bwoken!

OPERATION
The PCM adjusts engine idle speed through the idle air control solenoid to compensate for engine load, coolant temperature or barometric pressure changes.

The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control solenoid pintle protrudes into the air bypass passage and regulates air flow through it.

The PCM adjusts engine idle speed by moving the IAC solenoid pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning and power steering).

When engine rpm is above idle speed, the IAC is used for the following functions:

Off-idle dashpot
Deceleration air flow control
A/C compressor load control and power steering (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:

Gear position
ECT Sensor
Battery voltage
Ambient/Battery Temperature Sensor
VSS
TPS
MAP Sensor


Here's come pics to help!








Hope this helps !

[909Sxt]

Quote: Originally Posted by RACESRTX

I think it's Bwoken!

OPERATION
The PCM adjusts engine idle speed through the idle air control solenoid to compensate for engine load, coolant temperature or barometric pressure changes.

The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control solenoid pintle protrudes into the air bypass passage and regulates air flow through it.

The PCM adjusts engine idle speed by moving the IAC solenoid pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning and power steering).

When engine rpm is above idle speed, the IAC is used for the following functions:

Off-idle dashpot
Deceleration air flow control
A/C compressor load control and power steering (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:

Gear position
ECT Sensor
Battery voltage
Ambient/Battery Temperature Sensor
VSS
TPS
MAP Sensor


Here's come pics to help!








Hope this helps !

thanx bro ima check when I get home