96 115 johnson won't run on low idle

[CarlCioffi]

I have a 115 johnson that has recently had the carbs rebuilt, new plugs and wires. The fuel pump has been replaced with a pump that has no oiler so the gas has to be mixed. The motor runs fine except if I try to set the proper idle is eventually pukes. I've only been able to run it idling at around 1100 rpms. The rpms go down after a while but then back up however it does not puke on me.

 

[racerone]

You start with posting a model #----There were 2 totally different 115 HP models in 1996.----Also the trouble shooting on an outboard starts with a compression test.---Post your numbers.

 

[CarlCioffi]

You start with posting a model #----There were 2 totally different 115 HP models in 1996.----Also the trouble shooting on an outboard starts with a compression test.---Post your numbers.

 

[CarlCioffi]

It's a J115TLE and the previous owner said the compression numbers were all in the 120 range.

 

[racerone]

Some will argue.----But you need to start with a compression test today.----And not what the previous owner said.-----And check for strong spark on each lead.----Good spark on that motor will jump a gap of 3/8" or more.-----Testing is the path forward.

 

[CarlCioffi]

I will definitely do that as soon as I get my hands on a compression tester. The spark test I can do.

 

[CarlCioffi]

Some will argue.----But you need to start with a compression test today.----And not what the previous owner said.-----And check for strong spark on each lead.----Good spark on that motor will jump a gap of 3/8" or more.-----Testing is the path forward.

so the compression test was 115-120 on all 4 with cold motor. Excellent spark as well. Just a note but I turned the idle down the other day and when I started it this time it was right at 2000. Also I noticed paint on the TDC Mark and from experience I put paint on the mark I'm trying to set it to so it can be seen.

 

[CarlCioffi]

So the compression test was 115-120 on all 4 with cold motor. Excellent spark as well. Just a note but I turned the idle down the other day and when I started it this time it was right at 2000. Also I noticed paint on the TDC Mark and from experience I put paint on the mark I'm trying to set it to so it can be seen.



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H

 

[CarlCioffi]

No clue how all that other crap got in there.

 

[CarlCioffi]

the compression test was 115-120 on all 4 with cold motor. Excellent spark as well. Just a note but I turned the idle down the other day and when I started it this time it was right at 2000. Also I noticed paint on the TDC Mark and from experience I put paint on the mark I'm trying to set it to so it can be seen.
I think I just had a brain fart. Could be old age.

 

[racerone]

Model # is missing the last 2 letters.-----I would check the flywheel key.

 

[ct1762@gmail.com]

J115TLE (DA) is a crossflow motor. when you say turned the idle down... are you doing it properly by disconnecting the throttle cable and using a shop tach with the engine in gear in the water adjusting idle stop screw? if you don't the idle wont respond and/or be all out of wack with the link n synch.

 

[CarlCioffi]

J115TLE (DA) is a crossflow motor. when you say turned the idle down... are you doing it properly by disconnecting the throttle cable and using a shop tach with the engine in gear in the water adjusting idle stop screw? if you don't the idle wont respond and/or be all out of wack with the link n synch.

I did not but that's a good suggestion. I was only using the tach on the dash out of the water. I will definitely try that hopefully tomorrow. Good suggestion. I will keep you informed. You obviously have more knowledge about outboards than me. I'm very experienced with engines but not so much with outboards.

 

[ct1762@gmail.com]

I did not but that's a good suggestion. I was only using the tach on the dash out of the water. I will definitely try that hopefully tomorrow. Good suggestion. I will keep you informed. You obviously have more knowledge about outboards than me. I'm very experienced with engines but not so much with outboards.

a rough estimate of rpm out of the water in neutral on the hose is 1000RPM give or take. Some of the older service manuals had a table telling you what the rpm should be on the flushers (no back pressure), in the water (backpressure) and in forward gear idling. the 3 cyl motors were 1100-1200rpm on the hose depending on shaft length. not sure why OMC stopped recommending those figures without backpressure.

 

[CarlCioffi]

My plan is to put it in the water today and check the tach. All I have is the dash tach but it will have to be good enough. I did get it in the 1100-1200 range. It runs rough. I am going to contact the seller and ask how long he let it sit in the yard because the last time I had this problem I was guilty of leaving it without starting it up regularly. Won't make that mistake again.

 

[racerone]

Drain the carburetors or run them empty when you put the boat on the trailer.

 

[CarlCioffi]

Model # is missing the last 2 letters.-----I would check the flywheel key.

I didn't find any flywheel key. The only markings on the flywheel are "NV".

 

[CarlCioffi]

Drain the carburetors or run them empty when you put the boat on the trailer.

I start it once a week if it's sitting around.

 

[racerone]

The flywheel key puts the flywheel in the correct position on the crankshaft for proper ignition timing.----If it shears the timing will change.-----And no you can not find a sheared key with a timing light.----Well thought out trouble shooting will find what is wrong with your motor !!

 

[CarlCioffi]

The flywheel key puts the flywheel in the correct position on the crankshaft for proper ignition timing.----If it shears the timing will change.-----And no you can not find a sheared key with a timing light.----Well thought out trouble shooting will find what is wrong with your motor !!

I didn't realize you were talking about that key. Yes that would be a problem. I would have to investigate that further.