3400 SFI engine books???

[ChromerGT00]

Does anyone know if there's an engine book out there for the 3400 SFI?
Not familiar with tuneups with this engine.
Are the spark plugs easy to access?

Thanks,
Joe

[sunrunner_pei]

Haynes has a repair manual out for the newer N-Body, and includes info on the 3400 V6. Sparkplugs aren't too bad, but not a walk in the park either. The front 3 plugs are a snap, the rear three require patience, come good tools, and tough skin. The process can be made a lot easier if you remove some parts. I found it best to remove the alternator, coils, and coil pack bracket.

Make sure you replace the plugs with AC Delco factory replacement platinums, or NGK TR-55IX Iridiums. These cars do not respond well to Bosch Platinum plugs, especially the +4.

[ChromerGT00]

Thanks for the help Shawn!
I will definitely check out the haynes manual.
Cheers!