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Message |
    
john glastonbury
New member
Username: john_g
Post Number: 1
Registered: 01-2008
| | Posted on Monday, January 21, 2008 - 10:08 am: | 
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We live in the tropics and have a 3 year old volvo penta EFI gas engine (GXI model), low hours, with sterndrive in a 28 foot sportscruiser. Since purchase 1 year ago there has been an intermittent (now constant) problem of not revving above 3000-3500 RPM when the boat is under load or when engine has been running for more than 10 minutes. Engine runs smoothly, not obviously fuel contamination. Any suggestions? |
Matt Broyles
Member
Username: dock_holiday
Post Number: 21
Registered: 09-2007
| | Posted on Monday, January 21, 2008 - 11:21 am: |
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John, it could be a plugged up fuel filter or other partial obstruction in the fuel line or possibly a bad anti-siphon valve at the tank. It sounds like you are getting a constant supply of fuel,always getting enough to keep running at partial throttle, just not enough to feed the motor and support higher rev's when you open throttle up all the way. Just my 2 cents.... |
john glastonbury
New member
Username: john_g
Post Number: 2
Registered: 01-2008
| | Posted on Monday, January 21, 2008 - 02:55 pm: |
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Matt, Thanks. We have changed the fuel filters twice with no significant improvement, but you may be right that there is another fuel supply problem. We are also wondering about the engine sensors and electronic control. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3181
Registered: 09-2006
| | Posted on Tuesday, January 22, 2008 - 12:42 am: |
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any alarms?
run the fuel pressure test on it |
john glastonbury
New member
Username: john_g
Post Number: 3
Registered: 01-2008
| | Posted on Tuesday, January 22, 2008 - 03:24 am: |
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Thank you 'Just in Time'. No alarms have activated. The next test we have planned is a fuel pressure test. Also we are checking the replacement cost of the engine sensors and the electronic management system. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3182
Registered: 09-2006
| | Posted on Tuesday, January 22, 2008 - 06:00 pm: |
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no plug it into a diagnosis system
this will tell you if any codes went off
let us know the results, before you replace anything |
john glastonbury
Member
Username: john_g
Post Number: 4
Registered: 01-2008
| | Posted on Wednesday, January 23, 2008 - 04:04 am: |
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Thank you again 'Just in Time'. I greatly appreciate the excellent advice that I have received. A Volvo diagnostics system was connected and the boat tested in the ocean(Coral Sea)under load - but no abnormality was detected. The testing mechanic had said that a sensor problem had not been excluded, but I learnt today that a sensor problem should have shown up (and also no alarms went off). Apparently the alarm system does not usually fail. So we are awaiting the fuel pressure test (hopefully this week)and we wonder if it is a fuel pump or fuel line problem. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3189
Registered: 09-2006
| | Posted on Wednesday, January 23, 2008 - 02:35 pm: |
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he could have checked fuel pressure with the diagnosis system |
john glastonbury
Member
Username: john_g
Post Number: 5
Registered: 01-2008
| | Posted on Wednesday, January 23, 2008 - 03:54 pm: |
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Thanks again 'Just in Time'. Interesting, I was told later that his testing unit could not check fuel pressure. I guess we will just have to wait now for the 'next' pressure test. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3192
Registered: 09-2006
| | Posted on Wednesday, January 23, 2008 - 04:50 pm: |
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he must use the old handheld one
he should use the diacom one is 10X better |
john glastonbury
Member
Username: john_g
Post Number: 6
Registered: 01-2008
| | Posted on Thursday, January 24, 2008 - 05:54 am: |
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Thanks "Just in Time'. You are correct as the mechanic only used a hand held device like a PDA (he said today that he was not sure what it was called). The Diacom site is interesting and the PC marine software looks to be what we really need. For the pressure test he is planning to ?screw a gauge into the side of the fuel pump, but he has said that he is not sure what the normal pressure should be. Would you happen to know where I may be able to check on this information. Thanks. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3198
Registered: 09-2006
| | Posted on Thursday, January 24, 2008 - 02:10 pm: |
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you need to find a new tech with volvo certifaction. This tech is going to blow your motor up
It is in the factory manual for pressure
i think 44psi on the high side and i forget the low side |
john glastonbury
Member
Username: john_g
Post Number: 7
Registered: 01-2008
| | Posted on Thursday, January 24, 2008 - 03:39 pm: |
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Thanks. You are quite right. I read about MEFI last night and came to the same conclusion. I will keep you informed. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3200
Registered: 09-2006
| | Posted on Thursday, January 24, 2008 - 03:49 pm: |
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mefi 4 then
i have the pdf for it if you want
explains everything, |
john glastonbury
Member
Username: john_g
Post Number: 8
Registered: 01-2008
| | Posted on Thursday, January 24, 2008 - 10:20 pm: |
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Thanks again 'Just in Time'. I saw on the Rinda site last night that our Volvo should have the MEFI-4. I would appreciate the pdf if it's not too much trouble - 'rglaston@bigpond.net.au'. I'm not a mechanic but am certainly learning about EFI. Your help has been invaluable. John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3202
Registered: 09-2006
| | Posted on Friday, January 25, 2008 - 12:37 am: |
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email send |
john glastonbury
Member
Username: john_g
Post Number: 9
Registered: 01-2008
| | Posted on Friday, January 25, 2008 - 02:13 am: |
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Thank you 'Just in Time'. Email arrived without problems. John |
Joseph Hajdu
New member
Username: punta_gorda
Post Number: 1
Registered: 02-2008
| | Posted on Tuesday, February 12, 2008 - 09:23 pm: |
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Hi! John, I have a 2004 Glastron 25 with 5.7 EFI engine. My engine has almost the same problem like yours. On 6-7 Miles/Hour runs smooth, as soon I speed up to only 10-12 miles/hour the engine start braking up! Like wroom-wroom... I'm a retired automechanic, right away I changed the fuel filter. Same problem. Than I did run the engine from a temporary fuel can to eliminate the fuel tank or suction pipe. Got not better. I have installed a new fuel pump, this kit of primary and high pressure pump cost $690 plus labor, because a mobil boat mechanis did it for me. Did not get better, the boat mechanic dissipeard. Dos not answers my call anymore. Now I realised that must be electronic problem...but nobody in my neigborhood has a scanner. THIS MUST BE A COMMON PROBLEM WITH THESE ENGINES.
This repairs going on for 4-5 months, I'm verry dissapointed. I have fixed cars all my life. Now retired, no scanner, no tools, no idea what to do... The ignation system is to complicated to service without a scanner. |
Joseph Hajdu
New member
Username: punta_gorda
Post Number: 2
Registered: 02-2008
| | Posted on Tuesday, February 12, 2008 - 09:32 pm: |
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I'm the newest member on this site, and just realized that I shoud have appeal to JUST-IN-TIME too.
Sorry! |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3347
Registered: 09-2006
| | Posted on Tuesday, February 12, 2008 - 11:14 pm: |
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Do u understand MEFI 4?
read up on it
You will need the scan tool
the VST tanks need to be cleaned |
Joseph Hajdu
New member
Username: punta_gorda
Post Number: 3
Registered: 02-2008
| | Posted on Wednesday, February 13, 2008 - 07:46 am: |
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I'm not going to buy a scanner just for this trouble, meantime can't find a mobile mechanic in my neighborhood, Punta Gorda, SW Florida. Looks like the marine EFI totally diferent from cars.
What is VST stands for?
Thanks for previos prompt answer! |
john glastonbury
Member
Username: john_g
Post Number: 10
Registered: 01-2008
| | Posted on Wednesday, February 13, 2008 - 02:10 pm: |
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Joseph,
We are still looking for a suitable mechanic for our problem here in Australia to diagnose the problem. 'Just in Time' has been very helpful to us.
John |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3355
Registered: 09-2006
| | Posted on Wednesday, February 13, 2008 - 06:46 pm: |
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vst
vapor seperator tank
the mefi is the same as in the gmc/gm cars
just have a little more sensors
Joseph Hajdu post this ? on thehulltruth.com, a ton of guys are from fl
the scanner is 600, i would loan it to u but a little too far away |
james larocca
New member
Username: dad2000
Post Number: 1
Registered: 03-2008
| | Posted on Tuesday, March 25, 2008 - 09:31 am: |
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I am running twin 5.0 gi volvo lots of trouble. also live in punta gorda. what is your email address |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3589
Registered: 09-2006
| | Posted on Tuesday, March 25, 2008 - 11:51 am: |
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just click on his name his email is there |
john glastonbury
Member
Username: john_g
Post Number: 11
Registered: 01-2008
| | Posted on Tuesday, March 25, 2008 - 02:46 pm: |
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Am slowly sorting through the problems with our 5.0 rev problem. With a new mechanic we found that the fuel pump pressure was normal. Testing showed a faulty ignition coil and also one faulty spark plug. The coil and all plugs were replaced two days ago. The hull and prop growth will be cleaned today and we will take the boat for a run next weekend. The engine compression and timing have not been checked yet. |
Joseph Hajdu
Member
Username: punta_gorda
Post Number: 4
Registered: 02-2008
| | Posted on Tuesday, April 15, 2008 - 10:56 am: |
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Looks like my problem, after a year of agravation has been solved.
Like I wrote earlier, on the beginning the engine (2004 Volvo 5.7i)was braking up. A new fuel pump did not help. ($690+labor) NOW finally did not start at all. This way it's easy. A new fuse box with all new relleys has been intalled and that's it. The fuse box is a sealed unit. Inside probably has some printed circuit and/or condensors.
In Punta Gorda neighborhood I descovered a great Volvo-Penta specialist. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3776
Registered: 09-2006
| | Posted on Tuesday, April 15, 2008 - 11:06 am: |
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no they had some problems with them |
