Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

I purchased a 2004 Sylvan deckboat with a Volvo Penta 5.0…

Customer Question
I purchased a 2004 Sylvan...
I purchased a 2004 Sylvan deckboat with a Volvo Penta 5.0 GXi-E motor. It is experiencing two problems. 1) It seems to be flooded when starting it for the first time of the day. Position the throttle to wide-open and then crank it and it starts right up and runs well.
2) When throttling back from 1000 RPM to about 850 (i.e. approaching the dock) the motor typically dies. It will start right back up.The fuel cell and the rail pressure regulator had been replaced due to black painting clogging the pump(s). Rail pressure holds steady around 51 PSI.Any thoughts?
Submitted: 1 month ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 3 minutes by:
3/19/2018
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,752
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hello my name is ***** ***** am I speaking with? I read what you wrote. On your fuel pressure, if you cycle the key a few times, but don't actually start the engine, will the fuel pressure hold at 50+ PSI for 10 or 15 minutes, or will it drop down?

Ask Your Own Boat Question
Customer reply replied 1 month ago
I will check and let you know. Are you thinking one of the injectors may be leaking?
Customer reply replied 1 month ago
Forgot to mention my name is William.
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago

Hi William. W​ell,.... I'm thinking 4 different things right now, with leaking injectors being one of those things.

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

W​ere you checking now and going to get back to me or..?

Ask Your Own Boat Question
Customer reply replied 1 month ago
I'll get back to you. The boat is 15-20 minutes away.
Customer reply replied 1 month ago
Anything else to check while I'm there?
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago

Can you check the engine compression?

Ask Your Own Boat Question
Customer reply replied 1 month ago
Sorry, but I don't have a compression tester. The engine runs extremely smooth and steady.
Customer reply replied 1 month ago
It shows no signs of oil consumption.
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago

I'm not concerned with oil consumption, i'm concerned with the engine having a leaking intake valve, which can cause the issue. Basically there are 5 things that would cause that kind of symptom. 1. Leaking injectors 2. bad intake valve 3. bad TPS 4. Bad/Sticking IAC 5. Incorrectly reporting temp sensor. You can check #1 with a fuel pressure gauge. #2 with either a compression tester or a leakdown tester. #'s 3, 4 and 5 you need a scan tool to check.

Ask Your Own Boat Question
Customer reply replied 1 month ago
Here is the data on the fuel rail pressure:Test 1 Test 2 Test 3
Elapsed Time PSI Elapsed Time PSI Elapsed Time PSI
0:00 51 0:00 51 0:00 51
0:34 50 0:31 50 0:36 50
5:34 48 4:25 48 4:33 48
Customer reply replied 1 month ago
Let me try that again.Test 1
Time--PSI
0:00---51
0:34---50
5:34---48Test 2
Time--PSI
0:00---51
0:31---50
4:25---48Test 3
Time--PSI
0:00---51
0:36---50
4:33---48
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago

T​hat looks fine to me. What were you looking to do here? Were you looking to just have a conversation about the problem? Or were you actually trying to fix it with my help?

Ask Your Own Boat Question
Customer reply replied 1 month ago
The goal is to isolate the cause of it being flooded after being shut off awhile and the why it is dying on throttle back. I can do the mechanic work, but I'm looking for you to do the diagnostic work.
Customer reply replied 1 month ago
AutoZone says they have a compression tester which I can use. I will stop by there tomorrow and then do a compression check on each cylinder.
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago

W​ell... I can't do diagnostics work without diagnostic results from tools. If I could i would not have spent thousands of dollars on tools myself. Right now you need a compression gauge and a scan tool if you want to continue. Are you able to buy those tools? Do you want to spend the money on them and continue, or do you want to call it quits and just take it in?

Ask Your Own Boat Question
Customer reply replied 1 month ago
You're right. It doesn't make sense for me to buy an expensive scan tool for one diagnosis and if the issue is a bad intake valve then the boat is going to the local mechanic anyway. I could do a hit-or-miss attempt on the IAC and/or TPS, though. The cost on those two parts is fairly cheap. Which of the two would you bet on?
Marine Mechanic: Jason, Marine Mechanic replied 1 month ago

H​ello and sorry for the delay. When you last replied last night I had already logged off for the evening. Between the two, the IAC or TPS. The TPS would be the more likely of the two.

Ask Your Own Boat Question
Was this answer helpful?
Ask Jason Your Own Question
Jason
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,752
16,752 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

695 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

16,752 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,003 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
I have 2 Yamaha 200 ho on my 28 Boston whaler. One is giving
I have 2 Yamaha 200 ho on my 28 Boston whaler. One is giving a lot of gray smoke when I start it. What could be the problem… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I have a Yamaha E40XMH outboard that took a bit of a beating
Hi Jason,I have a Yamaha E40XMH outboard that took a bit of a beating to the gearbox. The reverse gear slips out into neutral by itself and it feels like neutral is more like a “half gear” where the c… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
Regarding the tank cap. When it first started acting up. I
Regarding the tank cap. When it first started acting up. I had a friend go to the tank and loosen the cap while it was running poorly. It didn't improve. Should it have?… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,003 satisfied customers
I have 24 foot pontoon with newly acquired 2012 115 hp
I have 24 foot pontoon with newly acquired 2012 115 hp mercury 4 stroke outboard. What size prop is optimal for my boat. … read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
My question is for a Craft boat tech.. Where is the water
My question is for a Chris Craft boat tech..Where is the water heater located on a 1986 332 Chris Craft commander located?… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
How do I plug my card into a computer? I have just brought a
I have just brought a Lowrance hook 4 sounder which I want to register but I don't seem to have a port suitable in my computer. … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 98 exciter 135 se jet boat and I was needing to
I have a 98 exciter 135 se jet boat and I was needing to know what compression should be from factory? And if what I have is … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 1979 mercury v6 175. I changed the stator to a 16
I have a 1979 mercury v6 175. I changed the stator to a 16 amp. Also added a voltage regulator and removed the rectifier. I replaced the trigger. I rebuilt all three carbs and cleaned and flushed the … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Both tachs on my 8.1 Crusader engines do not work and my
Both tachs on my 8.1 Crusader engines do not work and my mechanic thought it could be the ECM's. I find it odd both ECM's could be bad. The boat is a 2004 Silveron aft cabin with only 65 hours, believ… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I am looking at buying a 1996 marlin ex NM state police boat
I am looking at buying a 1996 marlin ex NM state police boat with 7.4l Mercruiser with 580 hrs. With a dual axle trailer. For $4000 firm. The boat is a little hard starting and the batteries are being… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I have a LMS-522 that quit working for me. It turns on but
Good afternoon, I have a LMS-522 that quit working for me. It turns on but does not do anything else and then shuts off after about a minute. Any suggestions? … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 1997 Mariner Mag III that I can't get to go above
I have a 1997 Mariner Mag III that I can't get to go above 4000 RPMs all of a sudden … read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I have a 1993 7.4 mercruiser raw water cooling system.
I have a 1993 7.4 mercruiser raw water cooling system. Replaced raw water and circulating pump and t-stat and housing 3 months back. Boats been running great at a steady 160 degrees. I was stuck on sa… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I just purchased a 1986 Sea Ray 340 sedan bridge and would
I just purchased a 1986 Sea Ray 340 sedan bridge and would like to replace the sea water pump and alternator belts on both engines but cannot find information on how the belts are tension-ed. In parti… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
Rebuilt a carb on a 25hp f252012 4 stroke yamaha and did not
hi, rebuilt a carb on a 25hp f252012 4 stroke yamaha and did not count how far the pilot screw was inserted motor is running rough at idle bogs when giving it throttle. i have a service manual and it … read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I have a 2003 Yamaha marine f200. This unit is over
Hello I have a 2003 Yamaha marine f200. This unit is over charging. It like 15.6 volts where is the regulator… read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I have a 1999 mercury 150 saltwater series outboard. All the
I have a 1999 mercury 150 saltwater series outboard. All the electronics have been completely replaced, compression is good in all cylinders and the carb has been freshly rebuilt. when I put the boat … read more
Jason
Jason
Marine Mechanic
16,752 satisfied customers
I have a Lowrance Elite 7 HDI that worked fine when I stored
I have a Lowrance Elite 7 HDI that worked fine when I stored it for winter. Plugged it in this week and nothing. I feel it has to be the power source or the unit itself. Any suggestions? I don't want … read more
Clamp-onTech
Clamp-onTech
405 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