no fire on mercruiser

[yeehaw]

I have a mercruiser 140, when the key is in the on position both sides of the coil read right at 10v. I have no fire out of the coil, i put on a new coil, still same problem. Any suggestions?

 

[achris]

Re: no fire on mercruiser

And the ignition system is..... points?, DDIS?, EST?

If you don't know, post the engine serial number and/or year (not the boat, the engine)...

Chris......

 

[Glastron_V210]

Re: no fire on mercruiser

Where to start....


1st, does the boat turnb over easily?

If yes, the batter is ok. If not, try to jump is and see.

It sounds as if the + connection to the coil is broken or high resistance. It can also be a faluty ignition switch dirty contact.

Try to determine which wire is from the + of the battery. One will be from the + and the other will go to the ignition system (Points or electronic system, whichever you have).

If you can identify it, then run a wire directly from the + of the battery to the ignition coil. Try to start the engine. If it runs, there is a break in your + wire (IE: track it down and fix it). You will have to remove the jumper to stop the engine.



Chay
Chay

 

[fishrdan]

Re: no fire on mercruiser

140HP? I assume it's points, have you looked at the points, changed them, set dwell and timing?

If the ignition hasn't been worked on in a while it might be best to do a complete tune-up on the ignition, plugs, wires, cap, rotor, points, condenser,,, and then set the dwell and timing to spec.

BTW, 10V at the coil is normal, it uses a resistance wire to drop the voltage to the ignition. You should get a full 12V while cranking the engine though.

 

[cedarjunki]

Re: no fire on mercruiser

did you actually check the coil output? or just assuming so since theres no fire at the plugs?? could be numerous options...

 

[achris]

Re: no fire on mercruiser

.... could be numerous options...

And until we know which ignition system he's got, we are just making WAGs....

Chris.......

 

[fishrdan]

Re: no fire on mercruiser

And until we know which ignition system he's got, we are just making WAGs....

Chris.......

Eh Hem (clearing throat)

That would be a SWAG, not a WAG...

 

[achris]

Re: no fire on mercruiser

Eh Hem (clearing throat)

That would be a SWAG, not a WAG...

'S' for ..... Stupid or silly?

 

[fishrdan]

Re: no fire on mercruiser

Super...

 

[achris]

Re: no fire on mercruiser

Maybe supercilious?

 

[oops!]

Re: no fire on mercruiser

you guys are just all out crazy....


try plugging in the lanyard.......lol

 

[achris]

Re: no fire on mercruiser

... when the key is in the on position both sides of the coil read right at 10v....

...try plugging in the lanyard.......lol

Not the lanyard.... Lanyard switch kills coil power.... Regardless of ignition type...

 

[yeehaw]

Re: no fire on mercruiser

It is a points system, all are new, points condenser cap rotor and coil are new. i tried the jumber to the coil still no fire out the coil. i tested coil output with a plug at the end of coil wire...

140HP? I assume it's points, have you looked at the points, changed them, set dwell and timing?

If the ignition hasn't been worked on in a while it might be best to do a complete tune-up on the ignition, plugs, wires, cap, rotor, points, condenser,,, and then set the dwell and timing to spec.

BTW, 10V at the coil is normal, it uses a resistance wire to drop the voltage to the ignition. You should get a full 12V while cranking the engine though.

 

[Bondo]

Re: no fire on mercruiser

It is a points system, all are new, points condenser cap rotor and coil are new.

Ayuh,... Who did 'em,..?? Are they Set right,..?? Is there Power to the Points,..?? Is the distributer properly grounded,..??

 

[achris]

Re: no fire on mercruiser

Real quick test... Pull the dissy cap off and watch the points gap while the engine is cranked.... See a spark between the points? Good.... Problem is the coil... No spark, start looking for why.

Chris......

 

[JustJason]

Re: no fire on mercruiser

It is a points system, all are new, points condenser cap rotor and coil are new. i tried the jumber to the coil still no fire out the coil. i tested coil output with a plug at the end of coil wire...

So did it have spark before the new points and everything else were put in? If it did... i'm guessing somebody did the points wrong.

PS~ you can properly test a coil with a spark plug, you need some kind of adjustable gap tester.