#3 & #4 plugs no fire


Information and questions on GL1500 Goldwings (1988-2000)
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bswildbill
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#3 & #4 plugs no fire

Post by bswildbill »



did ohm test the coils are in tolerance switched wires from 1&2 coils to 3 & 4 dead fire went to 1 & 2- 3&4 were fireing manuel said it was ecu bought another ecu unit off ebay suposely off running bike (same year 1990 gl1500goldwing) ecu unit are the same numbers but didn't help still not fireing 3 & 4 manuel leaves you hanging any suggestions where to look oh yea changed relays out to make sure they were ok fuse is good aslso



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terryt
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Re: #3 & #4 plugs no fire

Post by terryt »

Change the coils to 3/4 even though you checked then they still can be faulty

bswildbill
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Re: #3 & #4 plugs no fire

Post by bswildbill »

when i changed the coil wires on top of coils from 1&2 to 3&4 3&4 had good spark and 1&2 didnt have any so really makes me think it something else tryed to get readings from plug going into ecu but dont really know what im doing and got nothing plugs at ecu look good

bswildbill
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Re: #3 & #4 plugs no fire

Post by bswildbill »

also the tach isn't working dont know if its related or not


'

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virgilmobile
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Re: #3 & #4 plugs no fire

Post by virgilmobile »

Key on.engine not running...
Probe each ignition coil wire at the module...still plugged in...they should all have the same voltage.
Yellow/white
Yellow/blue
Yellow/red.



bswildbill
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Re: #3 & #4 plugs no fire

Post by bswildbill »

ok will try it tonight thanks

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Re: #3 & #4 plugs no fire

Post by bswildbill »

ok checked it at the white plug coming out of wireing harness beside the ecu 10.43 on all 3

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ct1500
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Re: #3 & #4 plugs no fire

Post by ct1500 »

This engine will start and run, correct? You sure it is a 1990 with original wiring? '88 & '89 years had some additional wiring spliced off the yel/blu coil trigger wire which just happens to be for the center 3-4 coil.
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Re: #3 & #4 plugs no fire

Post by virgilmobile »

I'm expecting a short on that line(no/much different voltage).The reason..You mention that your tach doesn't work either.I'm thinking that it's related.
The module does not provide volts to the coils..it's a pulsing ground to make the spark.
If you unplug the ignition module..key on..you should also have battery volts on each of the three wires.
Keep us posted please.

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virgilmobile
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Re: #3 & #4 plugs no fire

Post by virgilmobile »

Ok posted after your test...
White plug...lemme look at this.

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

I thought that (as mentioned) only the 88/89 had the harness attached to the module with plugs on it.
Can you verify the year or the part?
Take a pix of it if needed.
And yes,the 88/89 tape a coil trigger wire to feed the tach.

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bellboy40
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Re: #3 & #4 plugs no fire

Post by bellboy40 »

He was probably on C54. It is a white 4 pin connector near the ECU that has the wires going to the coils in it.

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

Ok.on the 88/89 the tach is driven from coil#1/2..the fuel pump relay is triggered from #3/4 (the middle coil).
Also you say you changed the coil wires.
Are you referring to the ignition wires or the yellow wires.

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

By the way..get a charger on that battery.
10.3 volts is too low..Should have been above 12 volts.
Any your positive about the "specs"??
My 88 had a very poor spark on one coil..The resistance is very low anyways but I did see a difference between it and the other two.

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Re: #3 & #4 plugs no fire

Post by bswildbill »

have to go work for a little while i'l get back with you bike I just bought from someone said all it needed was battery new battery- new starter relay- new fuel pump -had a friend clean carbs it was running but not good enough to go for a ride

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

bellboy40 wrote:
Mon Oct 15, 2018 3:33 pm
He was probably on C54. It is a white 4 pin connector near the ECU that has the wires going to the coils in it.
Yup..I see that now...

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Re: #3 & #4 plugs no fire

Post by bswildbill »

the wiring isn't the original,they took it to a shop and had a harness put on cause x husband had a problem and cut up old harness that was on it the bike ran for two years with the new harness on then she parked it and it sat for over a year she thought all it needed was a battery but fuel was left in it; fuel pump was clogged up wouldn't turn on changed it out with a new one ,started bike would run but not good, put seafoam in it,ran a little better but not good ,pulled carbs had a friend clean them up, put back on still wouldn't run good.checked for spark in all cylinders 3 &4 were not firing,put new plugs in , no help
the wires i switched at the coils were the ones on top of coils the yellow ones i just did it to see if it was coil or wires
thanks for information on ecu i didn't know how it worked i changed it out cause that's where the manual led me lol
will start tracing wires from tack tomorrow see if its ok

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

Before that..Start the bike and measure the battery volts..Is it above 13 volts when running?

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Re: #3 & #4 plugs no fire

Post by Charlie1Horse »

Was it the spark plug wires that you changed from 1/2 to 3/4? If you changed the spark plug wires between coils and the dead cylinders moved from 3/4 to 1/2, as unlikely as it seems, you may have two defective spark plug wires. If the dead cylinders moved with the wires, that suggests that the coils are ok. If you reversed the wires from the ECU, that should make 1/2 and 3/4 dead miss because it would cause both coils to fire at the wrong timing. When you swap two parts around and the trouble moves as well then it must be the part you changed.
Russell

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bswildbill
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Re: #3 & #4 plugs no fire

Post by bswildbill »

ok had a friend come over to help me trace down wires was having a hard time trying to hold meter and and test leads by myself we were testing everything from coils to tach couldn't find anything wrong ,he asked are you sure they're not firing everything checks out good. Well good news is they now have fire bad news is have no ideal what the problem was . hate to button everything back up not knowing I'm sure there is a bad connection somewhere

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

You had volts at the white plug indicating that it was ok from power all the way through the coils to that plug..
If there was a corroded/loose connection from that connection to the module just the action of unplug/plug in could have improved the contact.
Either at the white plug or the module.

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Re: #3 & #4 plugs no fire

Post by virgilmobile »

In all your troubleshooting..which was spot on by the way..the very last thing you touched that has a positive effect was that white plug...
All the rest of the connectors had been moved with no results...It just has to be a bad connection there...Scrape the blades and tighten the push on connection.

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Re: #3 & #4 plugs no fire

Post by bswildbill »

thanks for all the info learned a lot!!!! going to clean terminals and and button things back up this weekend and hope thats all it was lol

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Re: #3 & #4 plugs no fire

Post by Charlie1Horse »

And put a little dielectric grease into the connector to keep moisture from causing oxidation/corrosion and another bad connection. Use this every time you reconnect 'any' connector.
Russell

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virgilmobile
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Re: #3 & #4 plugs no fire

Post by virgilmobile »

Don't forget about us out here.
We wanna hear how well it runs.
Add a picture or two...We like pictures.
Good luck and keep us posted.



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