Question about 1997 Buick Skylark

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Would 02 sensor cause excessive carbon deposits

97 buick skylark 3100 popped codes and has unstable idle but runs like a scolded dog

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Pretty good guess on the 02 sensor; this feeds back info to the computer to either enrich or lean out the fuel-air mixture. I don't think it will pass emissions testing if you suffer from those in your state but it has probably already eaten your catalytic convertor.
You could check this by picking a hill and having a friend trail you and sniff the air when you are pulling the grade and punching the gas; if the cat is still alive, your friend will be greeted by that rotten egg smell; otherwise he'll just see black smoke from your unburned fuel.  

Posted on Sep 21, 2008

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Why is my 1995 Buick skylark 3.1litre idling at 4rpm and running hot? I replaced all the sensors and still have the same problem


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I would like to encourage you to consider buying the service manual for your car; they can answer questions such as your current one and help you decide if an estimate you have gotten appears to be fair or not.
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1 Answer

Buick skylark 3100 unstable idle


Unstable idle can be caused by a vaccum leak. Best way to find a vaccum leak I have found is to
take a tube ( fuel hose or 1/4 inch vaccum line 2 or 3 ft long ) and put one end to your ear and use
the other end to probe around the engine intake manifold area and where ever vaccum lines connect
as well as along each vaccun line to ck for breaks or splits. Another method is to use WD40 to spray
around manifold an vaccun lines. This method usually will ( if there is a leak ) stablize the idle and
cause the idle to increase. Or you can use carb cleaner or startind fluid but these are quite volital and
can cause a fire. So be very careful how you use them. The WD 40 is unlikely to catch fire that is why I RECOMEND IT. With the tube method you will hear a hissing or sucking sound when you find a vaccun leak. Good luck.

Sep 15, 2008 | 1997 Buick Skylark

1 Answer

Running rough or fast


If both the MAF and 02 have been replaced, try the TPS (Throttle Position Sensor) also check for vacuum leaks. the hoses that come out of the throttle body are very vulnerable to melt from heat.

Sep 15, 2008 | 1997 Buick Skylark

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