Car Forums  

Go Back   Car Forums > Technical Discussions > Repairs & Maintenance
FAQ Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-04-2004, 03:51 PM   #16
cmeseadoin
CF Freak
 
Join Date: Jun 2003
Location: Richmond, Virginia
Posts: 596
Iac/ais

GOOD STUFF.......I would definitly take VWHOBO's advise and take the car in to a trained mechanic being in your shoes. Myself, on the other hand, would first obtain the CORRECT OBD-II code (PXXXX) from the PCM. I then would inspect everything from vacuum lines to electrical connectors on the intake and make sure everything passes. I then would remove the IAC (commonly on some vehicles called the AIS motor) and clean it. Sometimes if you do not de-carb your intake periodically it can get dirty and then does not allow the IAC system to operate correctly. If Idle speed is too high, you have too much air getting into the engine if the problem is that AIS motor, or a vac. leak. Symptomology when the engine is cold can be excessive idle speed, or it can be started and then it will cut right off and not want to run at all without holding down the accelerator a little. All I can say without the car is right with what VWHOBO did, and that is.....sounds like an IAC related problem.


Quote:
Originally Posted by vwhobo
Okey dokey, this is my second time typing this and you know how painful that is for me. Server please don't dump me again. First I need to make a correction to a statement I made earlier so I can sleep at night. I don't wanna be a spewer of mis-information. The actual specification for the Data Link Connector is "located close to the instrument panel within the area that extends from the drivers door to 12" (300mm) beyond the vehicle centerline". Whew, I feel so much better now and you have some bitchin' automotive trivia.

DTC P1506 is in fact defined as "IAC overspeed error". Very simply the idle speed is conrolled by the PCM through the IAC. The IAC is essentially nothing more than a computer controlled, electrically actuated vacuum leak. More air equals higher idle. During operation the PCM performs system self tests and this is one of the things it checks. What the DTC is telling you is that for some reason the idle speed is higher than expected and the system is unable to bring it back down to the correct level.

So what the hell does that mean? Most likely your problem is one of three things. You could have a contaminated or sticking IAC. It's possible that by simply removing, cleaning and reinstalling it will cure your problem. You could have a vacuum leak such as a bad hose, PCV valve, deteriorated gasket, even a loose oil filler cap could cause it. Vacuum leaks are normally fairly simple to find but not always.

Now for the scary one. You said in your first post "at first there was a slight idling problem, it was idling too high in drive. My dad fixed that for me". For the PCM to perform self tests it relys on the outputs of many sensors. If any of these sensors are working correctly, but out of adjustment, it may cause the PCM to set a code for no reason other than this misadjustment. I don't know what your father did but he might have masked the original problem and created another one. This is why I continually stress the fact that unless you know EXACTLY what you're doing on a modern car don't touch it.

So, in closing, I can't tell you what your problem is through a computer. Unless you are a qualified technician or just get lucky you might chase your tail for a long time trying to fix the car yourself. This of course brings me back to what I said in my first post on this subject. Take your car to someone who knows what they're doing. It will be far cheaper in the long run.
__________________
2006 Mazdaspeed6, 2002 Pontiac Trans AM Ram Air WS-6, 1996 Jeep Cherokee Sport 4x4, 2002 Durango 5.9 R/T, 1995 Jeep Cherokee Sport 4x4, 1994 Ford Taurus SHO 3.2L, 1976 Buick 225 Limited, 1992 Miata, 2008 Miata.

Other toys: 2003 Honda Superhawk 996 sportbike, 2007 Suzuki M109R cruiser, 2006 Kawasaki KLR 650, 1996 and 1997 Sea Doo GSX limited watercraft.
cmeseadoin is offline   Reply With Quote
Old 03-06-2004, 12:15 AM   #17
sparkli
CF Newbie
 
Join Date: Mar 2004
Location: TN
Posts: 8
So... take it to a mechanic... nothing I can do myself? Do you all know of any online stuff that tells you how to clean the stuff you mention or even where it's located exactly?

sorry it took me so long to get back to you, had to go out of town yesterday.

Thanks guys... I have one other problem that is just boggling me, maybe I will post it in a day or two too and see what you all think it could be.

Thanks again.
sparkli is offline   Reply With Quote
Old 03-07-2004, 03:27 AM   #18
cmeseadoin
CF Freak
 
Join Date: Jun 2003
Location: Richmond, Virginia
Posts: 596
Advise

Sparkli,

Not being rude here, but if you have to ask those questions......you need not be touching the OBD-II system in that car. These things are very sensitive and no-one on here with any real car knowledge would advise anyone to touch a car if they do not know what they're doing. It is clear that you do not have the knowledge nor skills per say, so do yourself and your car a favor and head to the dealer or other qualified technicial for work. None of us have a problem helping you out, but none of us will advise a non-qualified individual to work on their car either.
__________________
2006 Mazdaspeed6, 2002 Pontiac Trans AM Ram Air WS-6, 1996 Jeep Cherokee Sport 4x4, 2002 Durango 5.9 R/T, 1995 Jeep Cherokee Sport 4x4, 1994 Ford Taurus SHO 3.2L, 1976 Buick 225 Limited, 1992 Miata, 2008 Miata.

Other toys: 2003 Honda Superhawk 996 sportbike, 2007 Suzuki M109R cruiser, 2006 Kawasaki KLR 650, 1996 and 1997 Sea Doo GSX limited watercraft.
cmeseadoin is offline   Reply With Quote
Old 03-07-2004, 04:31 AM   #19
sparkli
CF Newbie
 
Join Date: Mar 2004
Location: TN
Posts: 8
i totally understand what you are saying... that's the reason I wanted to ask about the problem... i am some familiar with the basics of the car, I wanted to see if it was something semi simple that i might be able to do myself... if it was something as easy as changing the oil or what have you... then i could do it, but after getting more info from you guys, I know it's not something I can do, and it will just have to wait til i have money to go to a mechanic.

Thanks!
sparkli is offline   Reply With Quote
Old 03-07-2004, 04:38 PM   #20
cmeseadoin
CF Freak
 
Join Date: Jun 2003
Location: Richmond, Virginia
Posts: 596
No problem Sparkli........I totally appreciate your quest for wanting to do this yourself and I am extremely glad to see you understand why I said what I did about having the knowledgte and skill to do it. I respect that money could be an issue for you but think of it this way......if you're gonna spend X dollars today to fix it at a qualified shop, or you can try to fix it and end up damaging something, you'll end up spending X+Y dollars and X+Y could = LOTS more than it should. We're here to help out though and if you have questions this is the place for them. Just give us all the technical info. you can and we'll work with it. Have a good one and don't forget to come back and post what ended up being wrong.
__________________
2006 Mazdaspeed6, 2002 Pontiac Trans AM Ram Air WS-6, 1996 Jeep Cherokee Sport 4x4, 2002 Durango 5.9 R/T, 1995 Jeep Cherokee Sport 4x4, 1994 Ford Taurus SHO 3.2L, 1976 Buick 225 Limited, 1992 Miata, 2008 Miata.

Other toys: 2003 Honda Superhawk 996 sportbike, 2007 Suzuki M109R cruiser, 2006 Kawasaki KLR 650, 1996 and 1997 Sea Doo GSX limited watercraft.
cmeseadoin is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Forum Jump



All times are GMT +1. The time now is 06:27 PM.

Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2002 - 2011 Car Forums. All rights reserved.