Mechanics

MY CAR IDLES TOO HIGH AT START.

1995 Buick Century • 165,440 miles

My 1995 Buick Century idles too high after I start the car. I find no vacuum leak However I do have a check engine soon light on and I don't know if the Idle position sensor is doing it. I have a the newer 3.1 V6 SFI Engine not the V6 3.1 MFI. Before all this, My Car was given to a friend of my wife's and we told her now to let no body, and I mean no body to touch the car for any reason. Well, she didn't obey, and her children tried to steal it and they tried to jump another car and the positive + jumper connector touched the air cleaner cover, (metal) and cause a engine fire and instead of diconnecting the negative wire connector - they looked on and let the wire burn until they got some dirt and stopped the fire, in 2 different places. My wife and I had the car towed to our house and there I bought a whole complete engine wiring harness and replaced the burnt one. Does that make you mad! Help me with this problem and get this car up and running again like it once did. Also can it be the ECM? How can I check if its bad? Thx u.
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Ao7777
July 22, 2012.



Ok, the no power could be a blown fuse as the fuse for the cigar lighter may be that issue.

The idle air control may definitely may be bad from the voltage surge from the wrong jumping.

Was this harness from an exact car? Did you replace the ecm with a new one? Did you jump the connector to flash out any codes?

Roy

ASEMaster6371
Aug 26, 2012.
Msg to Roy. Thx u roy, so far, there is no blown fuse, cigar lighter has power, question, does this paticular vehicle 12 pin DLC have to have a power wire in order to use a scanner to read the codes? Terminals A and B, there is no wires, just on the left side, 1st 2 on the top and 1 on the bottom left? I cannot jump the A and B Terminal because there isn't a A and B Terminal. How do you jump them? I did get the right harness from the exact car, the exact 1995 car, I have to go to the part dept at a gmc dealership. I did not replace the ecm. That why I wanted to check the ecm with a scanner to see if any problems, yet I cannot. It cannot communicate with the ecm. Let me know what else. Thx u.

Tiny
Ao7777
Aug 26, 2012.
Msg to roy, I replaced the IAC and still its idling very high. I do not see or hear any vacuum leaks at all. All I know that when I start the car, there is no SERVICE ENGINE SOON that comes on until the IDLE start going up and then the SERVICE ENGINE SOON light comes on. I did changed the ecm also before I got the IAC and still the idle comes on. This is something that I am coming to the end and don't know what to do. I need help really bad. Thx u.

Tiny
Ao7777
Sep 15, 2012.
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