Question about 1997 Buick Skylark
Scanned codes and it popped code po143 o2 sensor, and p1133 manufacture control fuel air metering/// and when i changed spark plugs the other day there was alot of carbon build up on them//// i don't have money to waste on an o2 sensor if it doesn't fix the 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.
Posted on Dec 04, 2008
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Posted on Jan 02, 2017
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