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View Full Version : Another quick question



DON-Z-26ZX
06-05-2007, 12:57 PM
Ok, got another question, I'll be pulling plugs this week & checking wires, I thought I'd even check my base timing. I know there is a procedure for placing the computer in a "service mode" to check base timing, but I'm not sure exactly how to do this....99 454 mag mpi. I know it involves grounding 2 terminals, & starting & running the engine, & then shutting it down....something like that :confused:...Somebody able to clear things up for me on that, it would be greatly appreciated. Oh, & what is should the timing be set at?

mrfixxall
06-05-2007, 01:04 PM
mercury makes a special plug that plugs into the dionostic plug that puts the computer in limp mode so you can time the engine..I wouldnt worry about the timing...