fuel or ignition problem

[rwwiefer]

I just had a 1989 I think, 155c power head (used) installed on my 1989 150 Johnson. It has a hard miss, almost like turning the key on and off rather quickly. It appears the port side 3 cylinders are burning clean (light tan not much oil residue on the plugs.) The right side 3 cylinders are very wet and oily. We plugged the VRO oil injector and I am mixing 50.1. I have had the boat out numerous times trying a few things my Mechanic has ask me to do. It also is short firing when trying to start it and takes sometime 5-10 trying. I can build a v-8 motor but this has me stumped.
I have about one more trip I can make this Friday before I will be off the water for awhile. Any ideas will be very much appreciated.

 

[hidef]

Re: fuel or ignition problem

Without knowing the model number I would suggest you start on page 48 of the CDI troubleshooting guide.

http://issuu.com/cdielectronics/doc...t.xml&backgroundColor=000000&showFlipBtn=true

 

[rwwiefer]

Re: fuel or ignition problem

Thank you, where will I find the model number.

 

[hidef]

Re: fuel or ignition problem

Transom Bracket or off of the welch plug on the block. The big thing is to determine if you have one power pack or two. The CDI guide is very good for troubleshooting though read through it until you find the configuration that matches your outboard. I would disconnect the yellow and black wire that runs to the power back from the side that isn't firing and see if that corrects your issue first as per the guide. You will also want to get an OMC service manual once you know what you have they are an excellent guide.

 

[rwwiefer]

Re: fuel or ignition problem

If it is a bad power pak, would the one off the 1989 150 work on the 1989 155c.

 

[hidef]

Re: fuel or ignition problem

It should but you need to do the CDI tests first and verify that it is not the power pack.

 

[ftknoxdaddy]

Re: fuel or ignition problem

Hello hidef, wanted to see if you could help me. I have a 1972 anniversary edition 85 hp johnson.
i broke my ignition key yesterday and hot wired the motor. it ran great for about fifteen minutes. then started missing real bad and ultimately died. it currently has no fire. i checked for power into the pack and have it. i have a good ground on the black lead. i hooked my test light gorund to power head and the other end to my blue lead. while cranking i get nothing out of the pack on the blue lead. i assume i burned up the power pack.

 

[hidef]

Re: fuel or ignition problem

ftknoxdaddy please start your own thread so that you can get your issue addressed promptly. I am not sure what your issue is as I am not familiar with your vintage outboard.

 

[rwwiefer]

Re: fuel or ignition problem

Finally had time to pull cowl off engine, I do have 2 power paks, # is 581933. There was mention in this thread on where to look for power head model number since this power head is a 155c that was put into a 150 gt frame. I have went through some of the trouble shooting sheets, howevery I'm not sure I understand when it says for one test to (Disconnect yellow wires from the rectifier and re test) I'm lost on if I disconnect the wires how do I re test. I know I should probably just take it to the shop right. Are the power paks on a duel setup the same, if so can I switch them from side to side and run the boat at the lake. Knowing I will still have the problem but at least I can pull the plugs an see if the problem switched banks.

 

[hidef]

Re: fuel or ignition problem

With dual power packs you can swap the power packs with each other. If the problem moves with the power pack then you have a bad power pack. example is currently firing on the left not on the right swap power packs around and it fires on the right and not the left.

 

[rwwiefer]

Re: fuel or ignition problem

I have not been able to locate the model number on this power head, I have found I believe 3 freeze plugs but they only have numbers, no letters. On my transom it does have the tag there but that is for the 150 gt power head. At this point the power paks are #581933 so if I do have a bad one I have that much info. i guess I would like to know what year this is.

 

[hidef]

Re: fuel or ignition problem

That part number is from 1979-80 this is the current part number and suggested price 0582556 POWER PACK $129.96.

 

[rwwiefer]

Re: fuel or ignition problem

hidef, I ran the boat again with switching the power paks, It made it worst, wouldn't get above 2200rpms. What I did notice though was while idling around since that is all I could do (idles perfect) if I raised the high idle lever on the selector the motor responded perfectly, like 1000 to 3500 fast a smooth. What is up with that. It started very hard as well, short firing continuously. It has a very good battery with high cranking amps. Is there anything in the selector mechanism that could cause any issues. Also still have not found a serial number, the pak # 581933 is what is on each power pak. The guy I bought it from said is was an 1989 power head.

 

[rwwiefer]

Re: fuel or ignition problem

Default Re: fuel or ignition problem

hidef, I ran the boat again with switching the power paks, It made it worst, wouldn't get above 2200rpms. What I did notice though was while idling around since that is all I could do (idles perfect) if I raised the high idle lever on the selector the motor responded perfectly, like 1000 to 3500 fast a smooth. What is up with that. It started very hard as well, short firing continuously. It has a very good battery with high cranking amps. Is there anything in the selector mechanism that could cause any issues. Also still have not found a serial number, the pak # 581933 is what is on each power pak. The guy I bought it from said is was an 1989 power head.

 

[hidef]

Re: fuel or ignition problem

You are trying to isolate where the fault is. Lets follow the steps. The yellow and black wires going into the power packs are the kill circuit wires. The kill circuit is engaged when the key is turned off. The two yellow wires from the stator to the rectifier are the charging circuit a bad rectifier can keep a power pack from functioning. With two power packs you can physically swap them from one side to the other and see if that fixes the issue if it doesn't swap them back. With the plugs removed and a spark tester swap the stator leads going into the power packs. Move the right stator leads to the left and the left to right. If the right was firing good before the swap does it still fire good after the swap. Also have you checked all of your wires to make sure none of them are cracked and are grounding out.

 

[rwwiefer]

Re: fuel or ignition problem

Thanks, my mechanic actually is finally taking the boat out tomorrow to see if he can isolate what I have been telling him. I will share with him what you have said.

 

[emdsapmgr]

Re: fuel or ignition problem

Would be nice to know just what your engine is. Your original 89 ignition system uses a single power pack. I would assume that would be the ignition system you would be using. The 581933 pack is from a 1979 V6 ignition system with dual packs. Any idea how this older ignition system came to be on your 89 engine?

 

[rwwiefer]

Re: fuel or ignition problem

My mechanic said it is a 1989 155c but he installed the older ignition system because it is better. That I don't know either way. I'm at work right know and I hope he has it at the lake right now. I will post back later once I know what he found out. I paid $1200.00 for the power head and $400.00 for him to install it.

 

[rwwiefer]

Re: fuel or ignition problem

This doesn't appear to be of any use from the info I found online.
Found the serial number on the silver freeze plug. How every this may be a rebuilt power head. Number is G2989031

 

[rwwiefer]

Re: fuel or ignition problem

Starting to think my Mechanic knows how these go together but isn't sure how to trouble shoot. I'm waiting for a power pak I got off ebay, I know problaly isn't the best decision I have made but the guy is a dealer and is quaranteeing it. When I switched the paks 2 weeks ago it run worse and both banks were wet. So I do think the right pak is bad beacuse it didn't appear to fire the port side at all. I think there is an issue with the star board side other then the power pak, I would have thought it would have run the same . Compression readings are top star board is 170 and all the rst are 180-185.