Question about Boating

1 Answer

Plugs are getting too much oil when idling.

I bought a used boat that has set up for a little over 3 months. The boat idles rough and keeps fouling out plugs. Once I get over 1200RPMS it runs great. When looking at plugs after they foul, they are solid black. Seems like they are getting too much oil. The boat has an oil injection system. How should I go about diagnosing this problem? Any help is highly appreciated.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 86 Answers

I would clean the carbs. I would bet that they are fouling out because your idle jet is plugged and that is causing the illusion of too much oil. If you clean out the idle jets then you should be able to run fine. You can also run the RPM's up pretty high and choke the engine out. Hold the choke until the engine is about to die and then release the choke. That causes a vaccum in the carb and can possibly **** the stuff out of your idle jet.

Posted on Oct 16, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Just changed the timing gears and chain,now the car idles rough and keeps fouling out one of the front spark plugs.

Year/make/,model???? Was the timing chain replaced to correct this problem or has this problem developed after chain replacement? Compression test performed? High mileage on engine?

Jan 13, 2016 | Cars & Trucks

1 Answer

Hello...I have a 2009 chevy cruze 1.8L ,some 3 months ago,the car had some pulsating and vibration during driving , so I changed the spark plugs and the problem was solved, but after about a month,the car...

Was any of the previous spark plugs fouled? Dirty? If so you need to investigate whether the problem is oil or fuel causing the fouling. Also a possibility is that you have a bad plug wire and when you changed plugs you disrupted the plug wire enough to make contact. Now possibly the plug wire is showing too much resistance causing a misfire at idle. Only way to be sure is to have the car scoped to see if the wires are proper or defective. That is unless you are the change parts and try type. In that case try a new set of wires. The reason is because at idle the voltage is not as high as it would be at higher rpm.

Aug 22, 2014 | 2012 Chevrolet Cruze LS Sedan 1.8L 4-cyl....

1 Answer

Idles rough and smokes when first stated

Worn valve guides allow oil to drain into the cylinders, causes blue smoke, fouled plugs will idle rough.
Coolant in the cylinders from a blown head gasket will cause white smoke.

Mar 30, 2014 | Toyota Camry Cars & Trucks

1 Answer

Hi, my1997 dakota with a 3.9 engine has a rough idle, has plenty of power i replaced plugs, wires, cap,pcv, rotor and added fuel cleaner. its a little better but still has a rough idle

My uncle worked at a dodge dealership as a head mechanic for over 30 years and he also found all of the 3.9 liter engines to have the rough idle. The rough idle cannot be explained but it can be made worse by buildup on the engine. I have a 2001 Dakota sport with the 3.9 and mine does it too and one of the first times i drove it it stalled and its not a Manuel transmission. But onc I changed the oil and put Lucas oil additive as well as regular additives to my gas every month or so it has reduced greatly and not stalled since. Hopefully you find this helpful.

Feb 28, 2012 | 1997 Dodge Dakota

1 Answer

Greetings all. Bought an 1983 Yamaha XJ650 Maxim late last year and love it. It ran great last fall and took it on a 2500 km road trip this June and it ran great. Two days after I got back it started...

Have you changed the oil and cleaned the air filter, after the fuel tap problem.
fuel in the oil can cause this symptom. the fuel ends up in the sump when the taps fail as yours did
also check choke is not stuck open, and battery is in good condition

Aug 15, 2011 | 1983 Yamaha XJ 650

1 Answer

We keep fouling spark plugs. I think our dealer purposely set the bike up that way. Now my son is a little older and knows how to ride but we keep fouling plugs. Is there an easy way to fix this...

Several ways to try. Be sure the air filter is clean and without any tears or punctures, install an in-line fuel filter, gap the spark plug at .030, be sure the stock spark plug is used ( NGK CR7HSA ), be sure the muffler not plugged up at all, increase the idle speed, and change the gearbox oil every 2 or 3 months. The only other thing would be to de-carbon the piston and head but that requires the head to be removed. Taking the head off isn't hard but you must be sure to have the valve cam timed properly when reassembled. If not installed properly, you can bend a valve the first time you try to kickstart. Please rate my answer.

Jul 12, 2011 | 2007 Yamaha TTR 50 E

1 Answer

2004 dakota 3.7l 2wd, overheated on the freeway running rough now and the next day it started exhausting a lot of white smoke when i started it and idled nroughly. It didnt overheat at idle but i didnt...

Sounds like a head gasket from your description. Look for coolant in oil (dipstick will look milky) If coolant is mixed in oil that would explain the rough idle (fouling plugs)

Jan 06, 2011 | Dodge Daytona Cars & Trucks

2 Answers

91 tercel deluxe 158k idles rough like a cylinder is not functioning, computer does not show a fault code, drives fine at high rpm, gets 30gpm still. Any theories? or should I just turn the idle up and...

Pull the plugs. Sounds like you have a bad plug or a bad plug wire. Even an engine that misses will run well at high speeds but if it's missing at idle you might have a little oil on one of the plugs. I had a 91 tercel, ran great but leaked a lot of oil which would in turn foul the spark plugs. I'm sure you either have a bad wire or plug. Wouldn't mess with the idle, not sure what state you're in but it could impact emissions testing. Best of luck m'friend!

Nov 06, 2009 | 1991 Toyota Tercel

1 Answer

Omc specs

You will need to repost this in the correct section, this one is for vacuum cleaner repairs.

Jul 13, 2008 | Vacuums

Not finding what you are looking for?
Boating Logo

Related Topics:

139 people viewed this question

Ask a Question

Usually answered in minutes!

Top Boating Experts


Level 3 Expert

693 Answers

ray gallant

Level 3 Expert

42881 Answers

Andrew Taylor
Andrew Taylor

Level 3 Expert

14793 Answers

Are you a Boating Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides