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Old 11-11-2002, 07:48 AM
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Red face Need to fix my V6 daily driver's idle!

Now, stick with me here because this could get lengthy! <img src="graemlins/pain.gif" border="0" alt="[pain]" />
Here's what's happening. Some mornings (not every morning though) when I start the car, the engine races. I don't have a tach so I can't tell you what it's actually running at, but it's like someone is pressing the gas down. Sometimes it will come down by itself like the cold idle aspect of the computer is supposed to do. Lately, when the racing happens, if you leave the car sit, the Check Engine Soon light pops on. When the problem happens, you can put the car in gear and the idle goes to a normal level. If you drive around for a little while (a minute or two) and then return to Park, the idle is fine. When the Check Engine light comes on, you can start to drive and it will go off and the car will run normal.
So far, I've replaced the IAC. There are no vacuum leaks. I really need to get this thing cleared up so that it doesn't all of a sudden leave me stranded some where. I'm not going to bring it to a shop because it's $75 for a diagnostics and they'll probably tell me, "We can't see anything wrong and it doesn't run bad for us."
My mileage is at 128,000 and the O2 sensor could still be the original. But would an O2 sensor cause a high idle? I'm thinking more along the lines of a TPS. Any thoughts or comments? I really need to take care of this!!!

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Old 11-11-2002, 12:57 PM
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Can't be the O2 sensor because the computer ignores it till te engine warms up. What car are you talking about?? <img src="confused.gif" border="0">
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Old 11-11-2002, 01:10 PM
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May be the coolent temp sensor for the computer,If this is a GM it has 2 wires yellow +black or white + black, it controls the cold ildle and rad fan.
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Old 11-11-2002, 05:26 PM
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Most likely if the check engine light came on there should be a code stored in the computers memory, unless of course you drive something like a 83 chevette which had no memory capabilities. By the time you finish replacing good parts you could have paid the $60.00 diagnostic charge somewhere. I have no personal experience but have heard commercials for an auto parts chain called Auto-Zone I think that offers free code readings on most cars. At least something like that would give you the code and if you had any questions pertaining to a specific code you could send me all the info in a PM and I might be able to help. Good luck.
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Old 11-11-2002, 06:00 PM
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buy the book on your vehicle it will tell you how to ground out your data terminal to read the trouble codes if the are any. it will also tell you how to ajust your idle air valve. it also might be an idea to look for vacuum leaks. i've had a similar problem with my pick-up it turned out to be a hose from my pcv to the bottom of my throttlebody
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Old 11-11-2002, 07:34 PM
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The car is a 1995 Buick Skylark with a 3100 SFI engine. I already have the book for it, but it's not real specific on "If this is your symptoms, this is your problem."
The paper clip trick won't work on this car because it uses a fla*****ype computer. From what I understand, the whole computer gets powered when you turn the key and it won't let you flash the codes by yourself.
I'm going to try to find a place that either rents diagnostics tools or does the free readings. I'll let you know if I need some help Don.
Thanks for the replies though guys! I guess I have a little more digging around to do!
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Old 11-12-2002, 08:37 AM
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A couple more things. When the car starts up and it runs normal, it usually takes a little while for the exhaust gas to come out of the muffler. When the problem happens, exhaust comes shooting out of the tail pipe immediately. Could that indicate something? EGR possibly?
When in Park and running normally, the engine sometimes has a tendency to vary in idle. Again, without a tach I can't tell you what the actual number are, but it is noticible if you "look" for it.
Occansionally when coming to a stoplight, the car will suddenly lurch forward. I can hit the brakes hard and it will stop and then the idle will return to normal.
Who knows, maybe I'll just run this thing with problems so that the 3100 will die and and I can throw a built-up 3400 in its place!
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