Coil outputs

[jvaccarino]

Had my buddy come over to assist in the troubleshooting of the motor...

Prior to him coming over, I pulled the plug wires to all three cylinders while running (one at a time).. Only the middle cylinder would cause the engine to choke. The top and bottom did not change anything.

I have spark going to all 3 cylinders, I have 120 psi compression, and fuel going to and THRU the carbs..

When we checked the meter on the coil, the middle one was reading 28000 I believe(but had constant voltage)... the other two were jumping from 18-24, to 27000...

Am I looking at BAD coils??

How important is the length of the plug wire? I bought a new wire from discount auto, they only at an 18" long wire..I would assume to takes more energy on a longer run.

Engine was running pretty rough.

other post links

http://forums.iboats.com/showthread.php?t=238697

 

[tashasdaddy]

Re: Coil outputs

you are getting too many threads going on the same problem. did you ever physically move the middle coil to see if it work on the other locations. if you haven't you are wasting your time, but the other members, who keep trying to help you. you have to trouble shoot in an order. you have to answer our questions. i know no more in this post than in any others. go back and read your threads, and answer the questions here. they are going to start getting aggravated, and ignore your post.

 

[jvaccarino]

Re: Coil outputs

I didn't want to post different questions about a different troubleshooting section.. Once it is posted, 15 more posts come up and my post is long gone..

To answer..

No I have not physically moved the coil.. Is that to test the wire from the powerpack?

 

[F_R]

Re: Coil outputs

If you move the coil and the problem follows the coil, then you know it's bad. Wire length should have no effect as long as you are not using resistance wire.

 

[tashasdaddy]

Re: Coil outputs

it is the test the powerpack and the carbs. you could have 2 bad coils, the only way to find out for sure with the equipment you have is to move the good coil you knows works, the the positions where the ones that don't work. we don't know if you have a fuel problem there of an electrical problem. you have to move the contact wire to the other coils position , and the spark plug wire. if it runs in that position you have a bad coil, totally exchange the coils position. see if the problem follows the coil or.

exchange the top and middle coils, if top runs, and middle doesn't the coil is bad, then move the good coil to the bottom, and put the botton in the middle. tell me the results.

Alot of times when you log in, you may have to look 2 or 3 pages back for your last post. it is going to get worse, as the number of post increase, due to people break out their boats for spring. any time some one post in your thread, it comes to the top.

 

[jvaccarino]

Re: Coil outputs

ok. will do. I have to get the lower unit back on this morning.. so until then..

 

[tashasdaddy]

Re: Coil outputs

sorry for being a little rough, but now you can see the reasons, for step by step trouble shooting. you have to eliminate the easy first.

 

[jvaccarino]

Re: Coil outputs

Cant seem to get the lower unit back on.. I cant get the gear shaft to sit into the clamp..

I am working alone also.

 

[tashasdaddy]

Re: Coil outputs

you need help. impossible for individual novice to do alone.

 

[jvaccarino]

Re: Coil outputs

ok. lower unit is back on. Seems like the engine is Idling higher now.. Will have to adjust.

ANYHOW.. Only the top cylinder now has a problem:

TOP Cylinder: No change in RPM when carb is sprayed into. No change when plug wire is removed from plug.

Next step- Moving good coil to top cylinder and firing it up.

 

[tashasdaddy]

Re: Coil outputs

yep. seeing it is now firing on 2 cylinders instead of one, it will idle faster.

 

[jvaccarino]

Re: Coil outputs

Moved top coil to middle and middle to top.

With 2 cylinders (top and bottom) both "good" coils, the engine runs rough. When I take off the top "good" coil, it runs smoother (does NOT sputter)

So the engine runs better on 1 cylinder than 3.

 

[jvaccarino]

Re: Coil outputs

Engine does not start with only the top cylinder (with good coil). SO leads me to believe its a fuel problem for that cylinder.

Engine fires up with the bottom cylinder and runs smooth..

Middle cylinder now has the bad coil.. but when it had the good coil, I could pull the plug and the engine would stall.

SO.. Seems like the TOP Cylinder needs a new coil.. and need to TS fuel problem. I pulled off the carbs already, floats were not stuck and the lines were all clear.. I pulled the idle off today and it was not clogged either.

 

[tashasdaddy]

Re: Coil outputs

did you test for spark on top cylinder with good coil?

 

[tashasdaddy]

Re: Coil outputs

if it has spark, then do the carb. you have to have spark.

 

[jvaccarino]

Re: Coil outputs

Yes, top cyl. with good coil has good spark. Middle cyl. with bad coil has very little spark.

Am I missing something on the carbs? Fuel is coming out of the hose to the carb, and the float is not stuck.. I can blow into the chamber and move the float up and down, and you can hear the air restriction change..

 

[tashasdaddy]

Re: Coil outputs

all that does is let fuel into the bowl, does not necessarily mean the fuel is going thru the jets into the intake. you have to do the jets as discussed in the other threads.

 

[jvaccarino]

Re: Coil outputs

I pulled the jets out, the hoses are clean.

On the top carb, The hose attached to the jet has a crack at the tip.. the hose is split.. But the tip is still covered.

 

[tashasdaddy]

Re: Coil outputs

that would create an air leak, but not cause the problem. you used the special screw driver and removed the jets, did you run a small wire thru them, can you see thru them.

 

[jvaccarino]

Re: Coil outputs

I have a small head screwdriver.. i'm an electronics man..


anyway, yes, the jets are clean. I sprayed carb cleaner into the drain plug jet, and saw the cleaner come up into the carb. Sprayed cleaner in the side jet by the throttle, and cleaner came out the top.