no spark from number 2 plug***just my luck 2 bad CDM"S****

[Leinenkugel#1]

1987 force 85 hp. Tried to start with just 1 cylinder (middle one) and would not start( disconnected the others) . Did the same for the others and it started. Any Ideas what I should do next?

How do you check for compression test? Instructions

Thanks

 

[JB]

Re: no spark from number 2 plug

Re: no spark from number 2 plug

This should have been part of your other post, L. Do the test I mentioned there and try spraying some fuel mix into the middle carb while she is at idle.

Spark is only one of several things that can produce a dead cylinder.

If the cylinder doesn't come to life then, do a compression check.

Squeaky clean plugs usually mean there is water getting into the cylinder, like through a blown head gasket. A compression test will show that.

 

[yohuallin]

Re: no spark from number 2 plug

Re: no spark from number 2 plug

are you sure is not getting a spark?, my boat does the same thing, but it does spark but for some reason is no making a combustion, to find out if the cylinder is sparking, pull out the plug wire, connect a spark plug to it, turn the motor on and carefully put it about half inch from the engine, you should see a blue spark, then kill the engine, if you get the spark that means that prolly has to do with your piston or carb that goes to that cylinder, after that do a compression test and if you get good compression like i did, then is most likely that the problem is the carb....

 

[Leinenkugel#1]

Re: no spark from number 2 plug

Re: no spark from number 2 plug

compression test was 115 in all 3
spark plug to block ---- no spark


We took the wire coming from CD box going to a known good coil that was sparking and plugged it into the wire going to the coil that wasn't sparking. We got spark! So this would indicate that the coil is good on cylinder number 2. The question is how do we know if the CD box is bad since this box feeds two cylinders and one of the cylinders is working. What feeds the CD box? Is it the stator? The wires go up to ? under the fly wheel. How can we test this?

 

[yohuallin]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

did you test the wire that goes to the cylinder that does not spark, simply just plug that wire to another cylinder, and see if it sparks, your problem could be the wire itself. doesnt happen often but it happens

 

[Leinenkugel#1]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

yes it sparks with that wire

 

[Leinenkugel#1]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

anybody have an extra CD module they may want to sell.

 

[Leinenkugel#1]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

another question. I have 2 modules. there is a red wire that is not connected to anything, I'm assuming that this would be for the 4th cylinder. can i hook the bad 2 cylinder (middle) , from the 1st module to the second module some how. ?

 

[yohuallin]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

uh? isnt your motor a 3 cylinder? you shouldnt have that extra wire....

 

[Leinenkugel#1]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

well, the Red connector does not connect to anything. there are no other wire to connect it to.

My mind is so scrambled trying to figure this out. My brother warned about buying a force engine.

The thing is, the module I think that is bad runs the 1st and 2nd cylinders but won't give spark to the 2nd cylinder. But I checked the coil for the 2nd cylinder (rerouted the the good 1st cylinder )(firing),,,, took the wire coming from CD box going to a known good coil that was sparking and plugged it into the wire going to the coil that wasn't sparking. We got spark! So this would indicate that the coil is good on cylinder number 2.

why would the module if defective still give spark to number 1 cylinder?

 

[maxum247]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

another question. I have 2 modules. there is a red wire that is not connected to anything, I'm assuming that this would be for the 4th cylinder. can i hook the bad 2 cylinder (middle) , from the 1st module to the second module some how. ?

If you have Prestolite Ignition (blue modules and coils.)

Try swapping the number 3 coil with the number 2 coil and see if number 2 now fires and 3 doesn't, if number 2 now fires and three doesn't you've got a bad coil.

If all checks out with the coils you can swap modules!

Each module is designed to run 2 cylinders, the extra wire on the no.3 module was designed to be used on the 4 clyinder motors.

You can switch the modules and wiring around and have 3 firing cylinders, providing the extra half of the module on 3 hasn't already been used and (is in good shape.)

Swap the entire module and wiring! (If not yor engine will be cross firing out of order.)

Switch the no.3 cylinder CD module and wiring to the no. 1-2 cylinder position then you will have fire on both the 1-2 cylinders.

Put the (good half) of the 1-2 cylinder CD module and wiring on cylinder 3 and you should have fire on the number 3 cylinder with the bad half of the module as left over wiring, no need to buy a new module you had your own spare all along.

Take pictures before you start so you don't get the wiring for the CD modules mixed up while swapping the modules and wiring around.

When doing this you should have a manual with wiring diagrams for your motor handy!

Good Luck!

 

[Leinenkugel#1]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

Question about swapping modules. Do the two cylinders from one module fire at the same time? The original problem is no spark on #2 cylinder. First we swapped the number one and two coil wires around and got spark on #2 and not on #1. Next we swapped out the modules 1&2 with 3. We still had fire on #1 and #3 and not on #2. I read a manual that said to disconnect the kill wire on one of the modules. If the dead cylinder starts firing it said the problem is likely the blocking diode in the other module. What wire is the kill wire?

Any other suggestions?

Where can I find a complete wiring schematic for an 85 hp force ob?
I ordered a manual but the diagram isn't all there?

 

[maxum247]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

Question about swapping modules. Do the two cylinders from one module fire at the same time? The original problem is no spark on #2 cylinder. First we swapped the number one and two coil wires around and got spark on #2 and not on #1. Next we swapped out the modules 1&2 with 3. We still had fire on #1 and #3 and not on #2. I read a manual that said to disconnect the kill wire on one of the modules. If the dead cylinder starts firing it said the problem is likely the blocking diode in the other module. What wire is the kill wire?

Any other suggestions?

Where can I find a complete wiring schematic for an 85 hp force ob?
I ordered a manual but the diagram isn't all there?

Did you just swap the spark plug wires around or did you swap the electrical plugin for the coil as well, need to do that for an accurate result!

If you did switch the electrical plugin on the coil and the spark plug wire for that coil to a different cylinder, sounds like the #2 coil is bad.

The cylinders fire independently of each other if not you would have one big combustion cycle and a mess!

My Clymer Force 1984-1999, 4-150 hp manual has wiring diagrams, got mine at napa but you can get them on ebay also.

 

[yohuallin]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

im having the very same problem, BUT one of my cd box feeds 1 and 3 cyl NOT 1 AND 2 sas the manual show, and it runs fine or it did at tleast, when i wire it just like the manual says it cranks and when is gonna fire it stops suddenly. also how can i test if the extra red wire hanging out is in working order before i swap the cd boxes

 

[Leinenkugel#1]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

Ok after many hours of tinkering we think we have 2 bad CDM's the front CDM is sparking the 1st cylinder and the rear is sparking the 3rd cylinder. We did a spark test in the dark on the 2nd cylinder and we could see a very small arc not enough for a gap arc. So I will be ordering a new CDM some where at the lowest price. So both CDM's are 1/2 working

2 days ago I had not a clue about out boards... I got educated very quickly (top, electrical)

 

[yohuallin]

Re: no spark from number 2 plug***FINDINGS*** HELP***

Re: no spark from number 2 plug***FINDINGS*** HELP***

Just so you know, i was having the very same problem, after many test i found that a wire had disconnected off the trigger, therefore the cdi was not getting a pulse, after i removed it, and fixed the wire, the cylinder fired, so take a good look at the wire coming off the trigger, make sure they are all there

 

[Leinenkugel#1]

Re: no spark from number 2 plug***just my luck 2 bad CDM"S****

did you have to remove the fly wheel?

 

[yohuallin]

Re: no spark from number 2 plug***just my luck 2 bad CDM"S****

yes i did, and it was hard,at the the end we got this big puller from autozone, its got 3 big arm thingis and a bolt in the midle

 

[Leinenkugel#1]

Re: no spark from number 2 plug***just my luck 2 bad CDM"S****

Man!!!!!! I ordered a CDM yesterday morning before I read your post. I'll wait and put it it and see what happens and hope its that. If not, I guess I'll have to pull the fly wheel also...........................

 

[Leinenkugel#1]

Re: no spark from number 2 plug***just my luck 2 bad CDM"S****

replaced the front CDM(I). All cylinders are now firing