How do you pull trouble codes for a 1995 Grand Prix SE without a diagnostic machine?

If it has the 3.1L engine, you should be able to read the codes from the "check engine" light flashes, if you jumper the A and B terminals of the DLC, then turn the ignition key to the "run" position without starting the engine. If your GP has the 3.4L engine though, that is OBD II, and you would need a scan tool.

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This web page shows the ALDL/DLC (Assembly Line Diagnostic Link/Diagnostic Link Connector) that should be in your car. Check the number of holes. It should be 12.

http://www.obd-codes.com/faq/read-gm-2-digit-obd-c...

Also outlines how to interpret the flashes into the codes they mean. It's kind of like Morse Code. You might want to do it a couple times to get used to the pacing. Code 12 is not actually a trouble code, and should flash at the beginning and end whether you have a trouble code or not.

This answer I gave to jaymax173 a couple months ago also summarizes the procedure a little more;

http://answers.yahoo.com/question/index;_ylt=Ai10d...

95 Grand Prix

1995 Grand Prix

Use a code reader that you can rent from an auto part store, I can do that in California. Once you have the code then you look it up in a code book that the reader comes with.