Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

Boat

I have a 115 4stroke 2004 mercury. Starts cold very well but

Customer Question
after running for 30+ minutes...
I have a 115 4stroke 2004 mercury. Starts cold very well but after running for 30+ minutes and then turn engine off it will not start for 30 to 45 minutes. Engine cranks well but wont start. It will start in the throttle only position immediately and runs smooth. When I move the throttle to the neutral position the motor will stop immediately. Engine will only crank and wont start again until we wait 30 t0 45 minutes. We have checked the entire fuel system and all seems good. I have been to an authorized Mercury dealer and an Evinrude dealer, they are stumped. HELP
Submitted: 1 year ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 1 minute by:
1/1/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,291
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hi Terry, my name is Jason.

All Mercurys are cataloged by serial number, and not year and horsepower. Can I get that number so I know exactly what you have (without it I can only guess)

Next, you have been to 2 dealers. I don't know what they have and have not done for diagnostics. And I don't know what they have told you. What kinds of questions did you have?

Ask Your Own Boat Question
Customer reply replied 1 year ago
serial OT 958026. Told dealers the same as I told you. The Mercury dealer checked the fuel system (water fuel separator,fuel lines,fuel bulb,fuel, cooler lines,fuel pump, vapor release tank??,lift pump). The other dealer checked electrical settings (all within spects),cleaned injectors,replaced neutral switch.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Got the serial. Did the dealer(s) taek the boat out on the water and duplicate the problem before they checked the fuel system?

Ask Your Own Boat Question
Customer reply replied 1 year ago
after each fix and with each dealer and myself
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Here is what this comes down to. The engine needs 3 things to run. Compression, timed spark ignition, and the correct amount of fuel. When the engine will not start, it's missing one of those 3 things. Compression really doesn't change on a hot vs a cold engine, so that leaves you with two. The engine is missing either spark, or missing fuel pressure. If you brought this engine to me, what I would do is go run the engine, pull the cover off and hook up a fuel pressure gauge. And duplicate the problem. Then, when it will not start, I would check for spark output with an adjustable gap spark tester. And I will check for fuel pressure with the fuel pressure gauge, and i'm also going to see if it holds pressure when the engine is shut down, or if it bleeds fuel pressure when off (It should hold).

It's going to either be missing spark. Missing fuel pressure. Or fuel pressure is going to be bleeding down when shutting the engine off, causing the engine to flood out.

That is what needs to be done specifically. Did your guys do any of that? I don't know how much or little you know about engines/outboard. Does that all make sense to you?

Ask Your Own Boat Question
Customer reply replied 1 year ago
Fuel pressure was a littlie low but didnt require replacement. I replaced anyway, fuel pressure now within specs.If I was missing spark or loosing pressure why can I start the motor in the throttle only position? As soon as I move the throttle from the throttle only position to the neutral start position the motor will immediately stop.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

When you say throttle only position do you mean in neutral, and also with the throttle all the way forward?

Ask Your Own Boat Question
Customer reply replied 1 year ago
Throttle only position= My throttle has a forward,neutral and reverse positions. When I push the nob on the side of the throttle and push forward the motor starts and revup(but wont go into gear, neutral only). The throttle is a Quicksilver model # ***** Hope this helpful.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

What pushing the handle forward does is allows extra air to enter the engine. If the engine now starts quicker/faster/better, then that would indicate the motor is in fact flooding out. Pushing the handle forward puts the engine into the "Clear flood" mode, which means it cuts the amount of fuel injected.

Did your dealer check to see if fuel pressure was leaking down when the key was turned off? What kind of hours does the engine have?

Ask Your Own Boat Question
Customer reply replied 1 year ago
Don't know if fuel pressure was leaking, but if so why can I start it in the throttle only position? 502 hours on engine
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

You can only start in the throttle only position because the engine is flooding. So that is what it is doing. The next step is trying to figure out why it is flooding, and that can happen for a number of reasons as well.

1. If fuel pressure is leaking down that means the injectors are leaking, dripping fuel into the engine when it is off.

2. If the thermostat is bad and the engine is always cold, that will cause it to flood on a hot restart

3. If the temperature sensor is bad, and the engines computer thinks it is always cold when it is really hot, that would cause it to inject to much fuel and flood the engine

4. If the throttle positioning sensor is out of spec, or out of adjustment, that would also cause the engine to inject to much fuel.

So those 4 areas would need some deeper investigation. It is definitely flooding, the next step would be to find out why it is flooding. Does that make sense?

Ask Your Own Boat Question
Customer reply replied 1 year ago
sort of. #1We have a new fuel pump and PSI is between 41-44 PSI, if pressure is leaking from pump that means the old and new pump are both bad. The injectors were sent away to be cleaned last week(no difference in our problem). #2 The thermostat was just replaced. #3 Don't know if the temperature sensor has been checked but feel that if it was we couldn't start in the throttle only position. #4 Same as #3. In all cases the engine starts immediately when in the throttle only position and stops immediately when out of that position. It seems that a flooding condition would run rough then stop.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

When you go to restart it. After you start it, if you let it sit and run for 30 to 60 seconds at a fast idle (holding an idle speed of 1000 to 1500 rpms in neutral) and the bring the throttle back. Will it then idle correctly? Is that something you have tried?

Ask Your Own Boat Question
Customer reply replied 1 year ago
When it starts it will idle for quite awhile (15min or more). Can't check RPM as tach is broken. I have let it run at a speed faster than idle, then bring back to idle and it continues to run until I take it out of throttle only and bring it to normal neutral and then it stops immediately. With my lack of knowledge I feel there is an electrical problem which only occurs after the engine is hot ie: a relay,broken wire,switch etc.
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Has it been hooked up to a diagnostic scan tool?

Ask Your Own Boat Question
Customer reply replied 1 year ago
The dealer attached the computer up to the engine last week and it ran during initial cold start, running for approx. 45 min turning off at end of trip at which time it wouldn't start, computer didn't show any faults,
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

I've covered every single possiblity. All that is left is for a competent tech to go go through everything I have covered. Do you have any further questions for me?

Ask Your Own Boat Question
Customer reply replied 1 year ago
No,thanks for your imput
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

You are most welcome and I was glad I could help. I do want to make sure you are happy with my service before you go. If you have a further question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the star you wish and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.

Questions do not close out, so if you have to come back later on with follow up questions to the issue you still can even after doing a rating.

Thank you and happy holidays!
Jason

Ask Your Own Boat Question
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hi Terry. No rating has been put through yet so I am just checking in. Did you have any more questions on the issue?

Thanks,
Jason

Ask Your Own Boat Question
Ask Jason Your Own Question
Jason
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,291
16,291 Satisfied Customers
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.

Jason is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

691 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

16,291 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

10,957 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,728 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

< Previous | Next >

Related Boat Questions
Have a dragonfly 4 updated to latest now every time I turn
have a dragonfly 4 updated to latest now every time I turn it on it goes through a complete system check … read more
Matthew John
Matthew John
Cert II Electronic Engineering
41 satisfied customers
I have a 2008 Wellcraft 232 Fisherman powered with a 225 HP
I have a 2008 Wellcraft 232 Fisherman powered with a 225 HP Yamaha. Is there any reason I can't re-power with a new 300 HP Yamaha ? … read more
Jason
Jason
Marine Mechanic
16,291 satisfied customers
I own a 1965 Hatteras Motoryacht with a pair of 1965 871N
I own a 1965 Hatteras Motoryacht with a pair of 1965 871N engines. The fuel tanks are in the keel and they each have their own separate ,pick-up tubes and 1000FG racors filters, then the engine filter… read more
Boat Doc
Boat Doc
106 satisfied customers
Im getting an over heat alarm when I run on hose with muffs.
im getting an over heat alarm when I run on hose with muffs. I noticed water coming out of the peephole when the motor is not running. is that a problem?… read more
Jason
Jason
Marine Mechanic
16,291 satisfied customers
I am looking for improvements in my top end speed. I have a
I am looking for improvements in my top end speed. I have a fairly heavy bow rider. Its a 1992 Baja Islander 208 with a 350 mag. I have rebuilt the engine. It has 8.5 to 1 compression and a mild cam. … read more
MarineService8
MarineService8
34 satisfied customers
Twin 3406E 800 hp engines, under 700 original hrs Both
Twin 3406E 800 hp engines, under 700 original hrs Both produce STEAM which increases at higher rpm Clean oil analysis: no glycol..etc All gauges steady and normal Perfect performance except steam. All… read more
Cat Man
Cat Man
Vocational, Technical or Trade Scho
2,990 satisfied customers
I have a 1998 9.9 2 stroke tiller manual start mercury
I have a 1998 9.9 2 stroke tiller manual start mercury outboard. For years it gave me no problems. I pull the choke plunger out 3 times and start it right away. It runs about 30 seconds , then dies an… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
10,957 satisfied customers
Suzuki df 70 serging at 2800 RPMs. I have replaced the
I have replaced the Injector pump and spark plugs .plugs showed signs of too rich fuel .Tried it out started fine but serges At 2800rpms … read more
Jason
Jason
Marine Mechanic
16,291 satisfied customers
Bought a used 2001 Sea-Doo Challenger 189 Bombadier and took
Bought a used 2001 Sea-Doo Challenger 189 Bombadier and took it out today for the first time and the hull completely filled with water! Drain Plus were in … read more
Boat Doc
Boat Doc
106 satisfied customers
I have a 1985 V4 120hp outboard motor that does not want to
I have a 1985 V4 120hp johnson outboard motor that does not want to idle, the carbs have been completly cleaned and rebuilt. whole motor lubed and everything. I am getting a lean pop on idle at random… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
10,957 satisfied customers
Have a 997 unit. freezes up about every hr. will not shut
have a 997 unit. freezes up about every hr. will not shut off. have to diconnect power and restart. ?? … read more
Matthew John
Matthew John
Cert II Electronic Engineering
41 satisfied customers
I have a 1998 225 ocean runner that I bought. It was running
Hi, I have a 1998 johnson 225 ocean runner that I bought. It was running fine when I picked it up. It was in the back of my truck on its side for a week before I installed it. … read more
Jason
Jason
Marine Mechanic
16,291 satisfied customers
My HDS 8 lost the color palete & has horizontal black lines
My HDS 8 lost the color palete & has horizontal black lines moving from top of screen to bottom..help … read more
Matthew John
Matthew John
Cert II Electronic Engineering
41 satisfied customers
I have twin 175 hp mercurys I was told there 1989s the
i have twin 175 hp mercurys I was told there 1989s the serial #'s are ob304322 and ob304329 can't find those #'s on any list … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
10,957 satisfied customers
My HDS 10 will come on but not respond and keeps cycling on
my HDS 10 will come on but not respond and keeps cycling on and off? how do I fix … read more
Matthew John
Matthew John
Cert II Electronic Engineering
41 satisfied customers
My 1994 evinrude 50hp tilt/trim drifts down. How do I fix
my 1994 evinrude 50hp tilt/trim drifts down. How do I fix it? … read more
Jeremy Ewell
Jeremy Ewell
Owner/Mechanic
Tohatsu Certified Technician
0 satisfied customers
I will type the summary of my problem and paste it here in a
I will type the summary of my problem and paste it here in a few minutes … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
10,957 satisfied customers
I have a 50 hp 2006 merc. elpt efi outboard. that is only
i have a 50 hp 2006 merc. elpt efi outboard. that is only turning 4800- 5000 rpms and burning a lot of fuel. i have recently replaced the high pressure pump filter, plugs ,oil and filter, and foot oil… read more
Jason
Jason
Marine Mechanic
16,291 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x