1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

I have a 1999 Javelin Renegade 19 with the 175 Johnson on it.This is my first bass boat and i enjoy the boat but it is giving me issues.When i first unload it at the lake and take off it works perfect or to the best of my knowledge it does.Starts up first or second turn every time and leaves good.I can trim around on the engine when going Wot and it reads about 42-4300rpm and to my knowledge that is performing its best .But after fishing a day and going to start back to the dock it loses all power ,starts missing,Rough idling where you can fill it shake the boat and takes forever to plane out ,But usually when it gets on plane it is fine .Well today it never made it on plane and i managed to get it to run maybe 5-10mph at WOT.This is the worst it has even done ,at least before it would finally get on plane and run faster


The boat ran fine all day up until that point.Stayed about the same 4200rpm at wot,never missed or made any noises.Shut it down, fished started it back up to leave and it started doing this again.Never fails to do this,And it always happens after you are running somewhere and shut it down fish then start it up to leave is when it goes crazy.


I have no way of telling mph as the speedo does not work but the Rpm tack does.So i have no way of knowing even if when it seems to performing Good if that is up to par.But i looked at the prop and it has a raker 14 1/2 x 24 3 blade stainless .


I have checked the fuel filter,made sure carbs opening up wot,new plugs gaped at 30 and using stabil in my gas.It is very Random when it does it and usually only happens after a day of fishing where you are shutting the boat down and starting it back up .And on times when i assume it is running the best it is turning 4200rpm .I just am lost guys and have no idead what it is or what to check

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

first off , if your tach is correct and it probably is, you are way over propped. you are lugging your motor. the operating range for your motor is 5200-5800 RPMs. I prop mine to run at the high end (5800). second, you need to check your compression, third , if compression is good and even (with in %10) then do a spark test with a spark gap tester. if you do not get a hot blue spark with a 7/16 gap on all cylinders, then order a DVA adapter (link in my sig below) and download the free troubleshooting guide also in sig below. but for goodness sakes go get a 17 pitch prop.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

i will be doing a compression check tomorrow as it is quick and simple to check.But i dont think it is anything like that as if it was a bad cylinder or low compression it should run like this all the time which is not the case.It comes and goes.It may run perfect all day then suddenly it just happens out of the blue.My first thought was maybe a fuel or electrical issue .



But on the prop i was curious as i had heard many people say it should be in the 5000rpm range.But even when the boat performs what i call good or as good as it has ran it still leaves the hole good and planes out quick.But with lower rpm may be leaving some mph on the table.The previous owner said it would run in the low 60s.But he also said he never had any issues like i am having out of it .Granted the boat sat unused for about 6 months .But i put new gas with marine stabil and plugs in before i even took it out on the water.

Here is a video of what it done today on the water.Keep in mind up to this point it ran a consistent 4200 rpm and i assume in the mid 50s mph but until i fix the speedometer i will not know for sure.
<embed width="440" height="420" type="application/x-shockwave-flash" src="http://v5.tinypic.com/player.swf?file=6pswhs&s=5">

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

[video]http://tinypic.com/usermedia.php?uo=TChd6DpwTVWPIEEu5U5%2BlYh4l5k2TGx c[/video]

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

Hold off on replacing the prop until you check out the motor.

Follow Sparkies advise, compression test and spark test, followed by DVA testing of ignition.

You could have a failing ignition with one cyl dead.

It is possible that you may be having an electrical component breaking down after heat soaking after running.

Unfortunately, intermittent problems are tough to track down, spark and DVA testing need to be done when the condition occurs to PROVE any ignition failure.

Just remember, there is NO RETURN on electrical parts, PROVE the fault before ordering or replacing any parts.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

Charlie may be correct about the prop. But I have a 150 on the back of a SV1900, and can only spin a 19 pitch prop around 5100, had to put a 15 on it. so you have a 175 on a 19' boat, I figure you will need a 17 at least. But you do have a different style hull, so get your motor in proper running condition, then check your WOT speed and RPM. I would do a good carb cleaning/rebuild just to make sure.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

yes i agree guys,The prop is something i can always fix later on .But now i am trying to at least get it back to running the way it did .If i can track down what is going on and get it back to running where it always did at 4200rpm .Then i will try to play with some props to get a little more optimal performance.

So many things i keep hearing to check i am almost at a lost.Some say fuel ,But i always run mid grade fuel with stabil marine additive in it.Put new plugs in etc.It is just odd,it starts up perfect and runs good most of the day then all of the sudden it is almost like a starvation issue or overflood of fuel where they just bog out and get rough idle on a car .

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

Aslo it has done this before ,where it would be real slow on takeoff and almost bogging but once it finally got on plane it would pick right up and go like normal.But yesterday what ever has append is either getting worse or finally broke down as it would not do nothing.If you click the video link you can hear me rev the engine up and it revs freely and quickly but drop it in gear and go wot and major power loss

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

That motor will freely rev with three dead cyls!

Slightly high carb float setting will cause the motor to run rich, eventually fouling spark plugs, the motor will STILL rev freely but be an absolute dog in gear until the plugs clear and begin firing.

Inspect the spark plugs, do the compression test, and do the spark gap tests, then confirm the ignition again while the motor is hot.

Repeat, there is NO RETURN on electrical parts. Testing is MANDATORY, just sitting here guessing won't fix a thing.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

post number 2 gave you the order to proceed..compression test, then spark gap test. if both pass then tackle possible fuel issues. take you about 15 mins.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

SparkieBoat said:

post number 2 gave you the order to proceed..compression test, then spark gap test. if both pass then tackle possible fuel issues. take you about 15 mins.

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I had a dealer look the boat over and he done a few test said it was fuel pump ,we put one on and problem is still present.ran fine about all day today then started the same issues.

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Everything came back good on the spark test also ,But if it was a fuel problem would it not get straighten out if you primed the bulb when running or choked it .As i tried today when going down the lake when it was not running good and it just bogged the engine down when you do either

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

It is really starting to get under my nerves,not being able to figure it out.Like today i thought it was fixed as it ran good for a few hours.THen i made a long run up river about 15-20 mins shut down fished went to leave and took a good 1/4 mile to plane out and had the rough idle and miss again where it would die if you gradually gave it gas on a slow take off

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

Have you gave the carbs a good cleaning recently?

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

an intermittent problem can be difficult to diagnose...you need to be able to DVA test your electronics while it is acting up. the only other option is to start changing parts, I would start with the power pack as they seem to usually be the culprit in a intermittent problem.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

I recommend you take a timing light with you. When it starts to bog, put it on each bank of cylinders to see if all 6 are firing. The shift assist switch and the SLOW system both kill spark to 1/2 the cylinders. It would be good to rule out issues with them.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

A rough idle, miss, poor acceleration, bogging and dying can be caused by dirt restricting idle fuel mixture.

A simple test is to momentarily 'bump' the choke/enrichener, Don't hold it in, just a 'bump', if it is a lean idle then that small boost if fuel should make a noticable improvement for just a second. If so, order carb kits and start cleaning/rebuilding the carbs.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

with it being an intermittent problem, my money is on the power pack..but it is possible to have intermittent fuel issues also.

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

SparkieBoat said:

with it being an intermittent problem, my money is on the power pack..but it is possible to have intermittent fuel issues also.

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The mechanic i took it to put a new fuel pump ,fuel line and bulb on it and he said it fixed it for him.But i had the same issues the other day when i took it out.So when it started acting up i put it in neutral and pumped the primer bulb up and it made no difference ,i also bumped the choke and it just Bogged the engine down .So i do not know what else is left that may cause all the issues in the fuel system.


But i have heard a lot on the power pack and issues it causes or perhaps the SLOW mode activating but i have no alarms or lights come on .But then again they may not work.As the trim guage ,water presure guage and speedometer do not work.But when i turn the key on it beeps and cycles through the lights .

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

hey Chris.....seem like we are having similiar issues....i just posted my issues yesterday on the same year motor.....the other day,after cruising out nicely, then trolling, then back to cruising, it acted up, I took out of gear and reved in reverse, then forward then back into gear and she took off.?....I am thinking it might be the shift assist switch hanging up and only letting 3 cylinders run?....( changed filters several times already)...hopefully we come up with something!....power packs might be next for me

Re: 1998 Johsnon 175 Issues with bogging,miss, no power,rough idle .Very random issue

DVA meter with long wires, so you can set in cockpit and operate the boat. Connect the meter to the primary side of the coil, when the engine acts up, you will see the voltage drop on the meter, check all 6 cylinders.