Jumper leads don't change timing

[70mustang]

Gentlemen,<br />I have a 99 Maxum 181ci, 3.0L Mercury I/O. The timing instructions in my manual says to jump the 2 white leads on my EST distributor before checking the timing. Upon jumping and bypassing the shift interupt switch the timing should be 2 degrees ATDC. Then when the jumper is removed the timing should be 13-17 degrees BTDC.<br />My timing read 14 BTDC with and without the jumpers. Has anyone experienced this issue? Or does anyone have a solutions? The engine runs OK, just wanted to do some winterizing and checking.<br />Thanks in advance,<br />Marty

 

[Don S]

Re: Jumper leads don't change timing

Did you disconnect the shift interrupt switch and hook the 2 ends going to the engine harness together? Be careful and don't hook the switch wires together, that won't work.<br />The problem could also be a bad module or wiring going to the module. Check the connections.

 

[70mustang]

Re: Jumper leads don't change timing

According to the manual, I was to disconnect the bypass shift interrupt switch and connect the two ends together. I did......<br />So, are you saying I should just disconnect the bypass switch wire and leave them unconnected?<br /><br />Also, you referred to a module. Help me understand what you are referring to. What is the module?<br />Thanks,<br />Marty

 

[Don S]

Re: Jumper leads don't change timing

What manual are you using?<br /><br />There are 2 things that have to be bypassed, The ignition module (The distributor white wires) and the shift interrupt switch. Are you doing both?

 

[70mustang]

Re: Jumper leads don't change timing

The manual I'm using if 1992-01 Mercruiser Stern Drives by Seloc pages 3-23 and 3-24.<br />Yes, I connected the 2 white wires with another wire that I striped both ends, and I diconnected the interrupt switch and connected the 2 ends together.<br />Uh, one other thing. My timing scale is different from the manual. The manual's scale has 5 teeth with one off-set indicating zero. My scale is 6 evenly marked teeth. I'm not sure where 0 degrees is.

 

[Don S]

Re: Jumper leads don't change timing

and I diconnected the interrupt switch and connected the 2 ends together.<br />

That is the one I was asking about. You don't want to hook the wires together on the switches, you want to hook the wires together on the engine harness side. <br />Regarding the scale, scrape the paint off, there are numbers under it that will tell you where 0 is.

 

[70mustang]

Re: Jumper leads don't change timing

Now you got me wondering about the interrupt switch. I'm not sure that I hooked together the wires going to the switch or the wires going to the engine harness. UUUUUUUUMMMMMMMMMM.<br />I'll have to check that. <br />Also, thanks for the paint scraping tip.