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Johnson 90hp (J90PLEEB) issues

Old 08-19-2020, 08:12 AM
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It doesn't sound like a Power Pack issue, but here's good link for how to test it;

https://goneoutdoors.com/check-pack-...r-8726514.html
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Old 08-19-2020, 08:18 AM
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Originally Posted by eman6501 View Post
It doesn't sound like a Power Pack issue, but here's good link for how to test it;

https://goneoutdoors.com/check-pack-...r-8726514.html
I have to ask, why does it not sound like a PP issue? Just trying to gain knowledge.
Old 08-19-2020, 08:20 AM
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Because youíre not having any issues with starting.
Old 08-19-2020, 08:27 AM
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Originally Posted by eman6501 View Post
Because you’re not having any issues with starting.
True, it's just that one cylinder.

I have spark, fuel and compression, just no response from the motor when I pull the plug. I have cleaned the carbs now 4 times and I think I am getting better and better at it!


Last edited by TopherMichael; 08-19-2020 at 08:34 AM.
Old 08-19-2020, 08:32 AM
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Originally Posted by eman6501 View Post
Because youíre not having any issues with starting.
Interesting, my motor has become harder and harder to start, and the way it's jumping around the rpms at fast idle looks like more than one cylinder is no spark/weak spark.. Thanks.


Old 08-19-2020, 08:35 AM
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What was the result of the timing, btw? Isn't there a timing base on these things? Sorry, I haven't worked on a 90 OMC in a while, so I'm guessing here. I do know that the air/fuel mixture screws on these things need to be correct. Oh, and that Seloc isn't a lot of help. Try to locate a Factory Service Manual and it will save you a lot of headache.
Old 08-19-2020, 08:41 AM
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Originally Posted by eman6501 View Post
What was the result of the timing, btw? Isn't there a timing base on these things? Sorry, I haven't worked on a 90 OMC in a while, so I'm guessing here. I do know that the air/fuel mixture screws on these things need to be correct. Oh, and that Seloc isn't a lot of help. Try to locate a Factory Service Manual and it will save you a lot of headache.
I need to buy/rent another timing light. I own one, however it is back at my house in Mass. With that said, will an automotive timing light work the same for an outboard?

Originally Posted by eman6501 View Post
Oh, and that Seloc isn't a lot of help.
Tell me about it, I have read their service manual several times now and it becomes really confusing as they jump motor to motor.


Old 08-19-2020, 08:43 AM
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Originally Posted by TopherMichael View Post
I have to ask, why does it not sound like a PP issue? Just trying to gain knowledge.
stator supplies the power / charges battery. Also sends power to the power pack. Timer base tells the power pack when to fire. Power pack sends the signal to the coils. If you donít have a cylinder thatís firing itís probably due to it not getting a signal. Iíve just gone through this last week. It took me a few days to figure it out. I had misfires happening. One cyl would never fire. I did not use the dva meter. I just used ohms. Coming from the power pack to each coil I was reading about 100 ohms, except for one I was reading open. Ordered the power pack And it ohmed out properly and started fine and ran fine. Started it 10 minutes later and I noticed my spark checker that I had hooked up now wasnít firing. I was 10 minutes earlier. According to CDI the black and white wires on my timer base should have about 220 ohms. I had 550. It was really stumping me because sometimes it would start and run fine and other times it was hard to start with idling issues. Ordered the timer base and the new one ohmed properly. Installed it and even though it sounded better with the new power pack it really sounds good now! So much smoother. I have yet to put it in the water. I have the idle speed set to 850 with no load. I will tweak it when I put it in the water. My motor is an 89 Evinrude 150xp. I had a bad power pack and a bad timer base. I am not a boat mechanic but I do tinker. If you have a cyl not firing you have an ignition issue. Timer base or power pack are ignition devices. Good luck and now Iíll let the dogs eat me alive!
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Old 08-19-2020, 08:49 AM
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Originally Posted by Skunked22 View Post
Ordered the timer base and the new one ohmed properly.
Where did you order from?

Originally Posted by Skunked22 View Post
I have the idle speed set to 850 with no load.
Could you share how you set the idle speed?
Old 08-19-2020, 09:03 AM
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I ordered from marine engine.com itís CDI brand.
as far As the idle mine is on the starboard side. Itís about 2 inches long and goes through the throttle arm? The bottom end of the arm connects to the throttle cable from shifter and the top of the arm connects to a cam the moves the carb throttle. Mine is a 2 inch flathead that goes through the arm and bottoms out at the block when Iím in neutral. Iíll send a picture later this evening. My timing light tells me the RPMs
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Old 08-19-2020, 09:18 AM
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Appears that my motor J90PLEEB timer base is an optical sensor. Which is arriving with the PP.

Last edited by TopherMichael; 08-19-2020 at 09:33 AM.
Old 08-19-2020, 09:39 AM
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Originally Posted by TopherMichael View Post
Appears that my motor J90PLEEB timer base is an optical sensor. Which is arriving with the PP.
agreed! Good luck
Old 08-19-2020, 03:54 PM
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Originally Posted by TopherMichael View Post
Appears that my motor J90PLEEB timer base is an optical sensor. Which is arriving with the PP.
Wait for the tool over timing light use. The optical sensor works off of light thru the timing wheel notches. The top cover over the sensor must be on for it to read properly.
No sunlight on it.
Old 08-20-2020, 05:32 PM
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I replaced the PP, optical sensor today, and all plug wires. I also, re-cleaned that 1 carb and the throttle body (this makes 5x cleaning that carb).

Honestly, I am starting to think the issue is in my head.

With the needle valve turned out to 5 3/4 (each carb), the motor fires right up. No sneezing or rough idle, however a bit sluggish when you tap the throttle but idles right back down.

Again, I pulled the starboard bottom plug and zero difference in RPMs (total head-scratcher). Sprayed premix gas into the throttle body and she took it like a champ, revved right up. I know the carb is supplying fuel as the plug is wet, just not sure why pulling the plug does not change the RPM's.

Questions...

1) How do you raise the idle once the motor is up to temp?

2) Which cylinder would be the 1 cylinder? I have a timing light, just unsure which cylinder is the 1.

Will post a video of the motor soon.

Thanks in advance for all the suggestions and help.
Old 08-20-2020, 05:43 PM
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Read through this page and see if you find any help;

https://www.maxrules.com/fixomcoisignition.html

Do you have the ďOISĒ system?
Old 08-20-2020, 05:54 PM
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Originally Posted by eman6501 View Post
Read through this page and see if you find any help;

https://www.maxrules.com/fixomcoisignition.html

Do you have the ďOISĒ system?
yes
Old 08-20-2020, 05:55 PM
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Definitely study that page because he talks about troubleshooting that in depth
Old 08-20-2020, 06:56 PM
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Read the article and have some questions.

1) Which cylinder is cylinder 1?
2) Does anyone have a photo of how best to route the tan wires?
3) Does this system eliminate the need for an idle adjustment as it is all digital?
4) is a “bank” w cylinders or just 1?

I ordered the Easy Timer Ignition Analyzer, should arrive Monday.
Old 08-20-2020, 07:00 PM
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The idle adjustment is in the timing detent tab. Link and sink comes to mind for the throttle linkages.
Old 08-20-2020, 07:56 PM
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You can buy and download this Factory Service manual practically immediately and Iím sure all those answers are there. If I knew them myself Iíd share but Iím afraid I donít. Check this link;

https://www.emanualonline.com/Marine...0aAgO_EALw_wcB

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