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Read the manual.
This is a problem with this engine. Read the link below.
Yup it definately does. One time I replaced my spark plugs then my check engine light came on. I read the code and it read cylinder 3 misfire detected. So I tightened my spark plugs even more and the light came right off. The rule is tighten them one and a half turns.
There are several things you might consider, first off I don't know what plug you are using but you might want to try one step colder on your spark plug. Here is an excellent article on reading spark plugs: http://dirtbike.off-road.com/dirtbike/ridenet.tech/How-to-Read-Spark-Plugs/ArticleStandard/Article/detail/332655
I'm just now learning about spark plugs, but I read that the ignition system may not recognize the voltage used in the iridium plugs. They require less voltage than platinum to start the engine. The iridiums have a smaller tip, requiring less voltage. The ignition system just doesn't recognize the voltage probably.
Checking for spark with CheckSpark is easy simply clip it on the wire and turn the engine over, Then check the lights, Green light means spark plug and wire are good, yellow light indicates a bad plug or wire, Red means no spark at all, and flashing red indicates low spark, plug short or flooded condition. CheckSpark actually evaluates the spark. So move from wire to wire read the lights and you could be done in less time than it took to read this. It's safe, simple and fast. You can get them on e-bay. Works on all engines with plugs and wires, new or old big or small.
Your spark plugs are leaking spark to ground. I had this problem on my 1999 Grand Prix, also after replacing plugs and wires. I read on one of the GP websites to remove the heat shield that your spark plug rubber boot slides into. AND, I put some dielectric grease on the tip and ceramic of the spark pulg to also help stop the spark leak. Buy a small package of it from Autozone for less than $1.
Poor gas mileage, misfire or the plugs have over 60,000 miles on them. Be careful when you replace the plugs. Don't use the cheap ones, I did that and my 98 ZX2 ran like crap. Put the more expensive ones in like Bosch Platinums or better yet get the Motorcraft Plugs from Auto Zone and you'll be fine... I did this and my gas mileage JUMPED from around 25 MPG up to 36 MPG.... Put a little antisieze on the threads to before installing them, this will make easier the next you change them to get them out.
40:1 from what I've read
1969 = serial start by 932 and 1970 by 032
First you will need a compression tester and tools to remove the spark plugs. Disconnect the coil so the engine will not start while testing. Remove spark plugs on the cylinders you want to test. Select the correct tester fitting for your spark plug thread size. Screw tester into the spark plug hole and crank over the engine for one to two seconds. Read compression tester and repeat for each cylinder you want to test.
The G6's spark plugs are located under the plastic cover of the engine compartment for the 3.5 V6, under the spark plug wire boots (the plastic ends of the wires you plug on top of your spark plugs). Once you get the plastic cover off you cant miss them, just follow the plug wire cables. They are easy to change if youremember to do one at a time, (since order does matter, don't mix up the cables!). Also don't over tighten them, expensive damage will be caused. Its best to borrow a torque wrench and read the new spark plug box instructions for proper tightness. Generally if you have trouble even finding spark plugs, it might be best to let someone else do this one rather than risk the damage. But there is no better way to learn than by doing :)