2002 90Ttlra No Spark

[99yam40]

what else could that be besides the CDI?

[pjhaddock]

Yeah. So it sounds like he is in agreement with the thought of the CDI dragging it down. I thank the both of you and will see what happens.

[99yam40]

My question was aimed at Rodbolt, but what is there between the plug you took apart to do the open test and the cdi. wiring/connectors is all I can think of.

when testing open and closed on the charge coil was everything on the output of the cdi hooked up?coils,plug wires, and spark plugs?
giving the voltage some place to discharge to?

[pjhaddock]

Testing loaded when the charge coil failed I had everything but the spark plugs hooked up as I wouldn't want the motor to possibly start if there was spark. Are you saying when testing loaded the plugs should be connected and in, with the possibility of starting? I could hook the harness back up and use the key to kill it if it did happen to start.

[99yam40]

I do not like to open end the plug wires, the high voltage needs someplace to go.
I think I remember reading that also somewhere

pull the plugs out of motor,stick back into plug wires ,and then wrap a bare copper wire around each of the plugs threads and ground that wire to motor.

if not testing ignition components when spinning motor like compression testing, pull the kill switch clip to keep plugs from getting spark

[pjhaddock]

Ok I'll do that this evening when I get home from work. Rodbolt mentioned in a comment that you can't keep charging them if the caps aren't being discharged. Sounds like he was saying the same thing. That maybe the charge coil can't output voltage if the caps are already charged, which would cause it to fail the test if so. I'll see if the test changes.

You two are good...you're just better at explaining it. Hope he doesn't take that the wrong way and still responds if he reads this..

[pjhaddock]

So I ran the test with the plugs in and no change. I unplugged the yellow wire due to the other post you showed me 99yam, and I have 190v (130 spec) out of the CDI and spark. It will only crank for maybe a couple seconds then stops with the yellow wire unplugged for some reason so I am not able to get it started. With the yellow unplugged I still only get 32V (60 spec) between the red/brown wire from the charge coil. Red/blue is 146V (100 spec). BUT I have spark!

[99yam40]

does this spark go away when it dies?
does this voltage out of CDI go away?
I do not know what the Yellow wire does, maybe someone else can tell you

I do not think the CDI can make the voltage increase from what the charge coil puts in, are you sure about the peak voltages?

cranking and running are different things, what do you mean by it only cranks for a few seconds

you need to find out what wires are from low speed and high speed charge coils.
cranking (Low speed turning of motor) voltage is needed to start and idle

[pjhaddock]

does this spark go away when it dies? I can't actually get it to start at this point.
does this voltage out of CDI go away? Yes as soon as I let off the remote trigger or it stops cranking.
I do not know what the Yellow wire does, maybe someone else can tell you All I know is the side of the CDI says to unhook the yellow for emergency running back to port.

I do not think the CDI can make the voltage increase from what the charge coil puts in, are you sure about the peak voltages? I tested them a few times with the same results, so I'm pretty sure.

cranking and running are different things, what do you mean by it only cranks for a few seconds Trying to start it is cranking to me. It cranks for maybe 2 seconds and then the starter stops, I have to hit the trigger again and same thing, maybe 2 seconds. Plug the yellow wire back in and I can crank for as long as I'd want, but there's no spark then.

you need to find out what wires are from low speed and high speed charge coils.
cranking (Low speed turning of motor) voltage is needed to start and idle

I'm pretty sure brown is low speed which is the one that is still under spec with the yellow wire unplugged.

[99yam40]

Br to Red is suppose to be the low speed charge coil, and that is reading too low.
did you see any voltage coming out to #2 coil while cranking over?
it should not be from what I read
Did you ever get a voltage reading on the crank position sensor?

Is the motor turning over at least 250RPM?

look at page 131 I think for specs on a 90
in CDI troubleshooting
https://issuu.com/cdielectronics/doc...ition_troubles


Someone has to know what disconnecting the yellow wire at CDI does/ bypasses to get the motor to run in case of an emergency

any input from those that know would be appreciated Rodbolt or Boscoe?
or anyone else with the knowledge

[99yam40]

Bump to the top

[pjhaddock]

Hey 99yam thanks for trying to keep it going, I ended up working a side job all weekend and it rained both evenings so I didn't get to look at it anymore. Hopefully I can tonight.

I haven't been checking #2 since the book says it doesn't fire when cranking or idling. I'll give it a check though. According to the tach it's turning around 300rpm's when cranking.

I responded Friday to your post asking about does the spark go away but it isn't here for some reason. Crank to me is turning the key trying to get it to start. With the yellow wire disconnected from itself it will only crank for 1-2 seconds and then it physically stops and I have to pull the trigger again, then same thing. Plug it back in and I can crank it for however long I would want. The controls up front are all disconnected so I can't choke it which might be why it won't actually start.

[99yam40]

Crank to me is turning the key trying to get it to start. With the yellow wire disconnected from itself it will only crank for 1-2 seconds and then it physically stops and I have to pull the trigger again, then same thing. Plug it back in and I can crank it for however long I would want. The controls up front are all disconnected so I can't choke it which might be why it won't actually start.

does the starter just stop or does it spin free?'
and I guess the trigger you speak of is turning the key to start.

I believe I would hook up the controls to see if it would start just for the heck of it.

surely someone knows what the yellow wire does when you disconnect it.
What does it bypass/ change?

did you measure the crank position sensor output?

[pjhaddock]

does the starter just stop or does it spin free?' It completely stops
and I guess the trigger you speak of is turning the key to start. The remote start trigger I got, to jump the starter solenoid

I believe I would hook up the controls to see if it would start just for the heck of it. I might just for the heck of it, it would be nice to hear it run again. lol

surely someone knows what the yellow wire does when you disconnect it.
What does it bypass/ change?

did you measure the crank position sensor output?No I haven't but I will look in the manual and see

[99yam40]

I do not understand how the starter will just stop if the relay is still energized.

can you check to see if your jump start device is de-energizing the start relay when starter stops