Question about 1999 GMC Sonoma
If there is no issues with your spark plugs, you don't have to replace them. There good up to 100,000 miles but if you want to replace them don't forget to replace the spark plug wires also.
The spark plugs are located in the head of the engine, If your have the 2.2 four cylinder engine. Your going to need a long extension to remove the spark plugs from the top of the heads.
If you have the 4.3 V6 vortec, you can reach all the spark plug through the wheel well on both sides. Just flip up the splash grade and you can replace all of them with an extension and a swivel spark plug socket. The number e spark plug on the drivers side (middle) you can only loosen and tighten the spark plug with the swivel socket and then remove and install by your fingers.
Good luck and thank you for using fixya.
Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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