VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

[blofish4]

Volvo 5.7GSI "98" model <br />280 hp. Fuel injected <br />READ BELOW UPDATE FIXED<br /><br />VOLVO engine does not achive WOT....<br />What it does...<br />It lacks power will only build to 3100 rpm fighting to get on plane.. Running like motor is weak.but,runs smooth,starts fine,idles smooth,just bogs under load.<br /><br />replaced oxygen sensor in throttle body and now starts and idles fine but, lacking power.<br />Any suggestions.<br />I have found somewhere to hook her up to a computer but, that is 70.00 bucks thought I would try here for suggestions.<br />Thanks,<br /> <br />I will be on here off and on until I hear something.<br /><br /><br /> UPDATE as of 6- 22-04<br />ok had it put on computer No codes[ figures]<br />what we know know.<br />COMMENTS NEEDED<br />1. motor getting to much fuel <br />2. Spark plugs were fouled from that[putting in new]<br />3. Thats all they can find but, still looking<br />Anyone know why it would be dumping to much fuel? <br />My brain is on overload<br />I do know it is electrical cause the fuel pump is controlled by the computer {brain}<br />I was grasping at straws hoping a code would show.<br />Thanks I really appreciate this.<br />***********************************************<br />Boat Fixed Running properly WOT<br /> <br />Found out yesterday 6-25-04<br />Saw mechanics Found flapper valve in Y pipe come loose and fell down into the pipe restricting exhaust flow also weak coil that was installed from the first shop.<br />Water tested today 6-26 with mechanic ran properly.<br />WOT is 4250 with no problem planing<br />END of my delimma

 

[hondon]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Water in your fuel comes instantly to mind.Remove that tiny water separator and take a fuel sample from it and let us know what you find.

 

[rodbolt]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

give some back ground on how and when this problem occured. when did the motor last run ok?<br />what transpired in the mean time.<br /> good luck and keep posting

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Thanks,<br />Took a fuel sample from a new filter seperator with no water.<br />As far as background.<br />Was running strong, when idling was searching for proper engine speed going up and down.<br />Replaced sensor in throttle body and achieved proper idle.<br />Next trip out..<br />Lack of power all the sudden this was not slow coming this happen in just one trip basically one trip great and the next this.<br />Thanks again for any comments.<br />Like I said she was running great.<br />Top speed before: 38-40<br />Now : 22<br />The prop has not been changed .. I have kept up this motor new manifolds with risers and has run great with them.

 

[dmorley]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

What happens if you put the old sensor back in?

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Haven't tried that actually threw that away.<br />I believe I may just let the computer check it out I want to think it is something electrical. <br />and the diagnostic might tell me or at least rule it out.<br />1. because the engine is running smooth <br />2. it just doesn't have the power it did<br />The motor itself seems to be great not a problem .<br />This all seem to happen after the new sensor.<br />I knew I should have kept the one one. So what else you think I can do to test this. <br />Do you think the computer will help tell me?<br />What exactually does the computer do anyway?

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

ok went outside found it I had it in the back of the truck. I can go out and test this later . Boat needs to be under load.<br />Are these known to go bad? A new sensor should not have made any differance right?<br />It was replaced with the same kind.

 

[Cut n' Jump]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

What is the fuel flow rate? Does fuel pressure drop under load? Try temporarily unplugging the knock sensor.

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Not sure what the fuel flow rate is. It has pressure but, haven't done a test for flow.<br />I am not sure this has 2 electric fuel pumps that only intermitly runs until pressure comes on then shuts off. <br />Is that the sensor screwed into the block next to the oil pan?<br />Thanks

 

[Cut n' Jump]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Yeah the knock sensor is right by the starter. Don't know if it'll mess with it. I saw one unplugged and the owner said it bogged when hooked up [went into limp mode?]. "replaced oxygen sensor in throttle body and now starts and idles fine but, lacking power." Do you mean the throttle position sensor or the idle air valve? The tps could cause that but the iac valve probably wouldnt. Good way to check flow rate is see if fuel pressure drops while its bogging. You could even have an unrelated problem like a secondary ignition miss. I'm no boat expert but have seen a similar problem on a gsi before. A good tuneup fixed that one.

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

I will have to check it out.<br />I have keep this up immaculate I mean oil changes on time good belts,new manifolds every 4 yrs... <br />This just bugs the *** out of me you know..I have just had her tuned up over at .... had all the electrical checked out 9+ hundred dollars worth and she was running great her timing just seemed alittle off well they fixed that and all the sudden now this..No power under a load.. So I am putting her on the computer down at .... and going to see what they find if it is electrical which my knowledge is telling me it is someone didn't do something right or not at all. I maybe trying to get a refund of some kind and have a penta tech look at it. But, I want the readout to prove what I know is fact.<br />Maybe cost more but, will be done correctly..<br />I could run her she starts fine starts right off but, no humph under a load..<br />I have the old oxygen sensor and I am going to try it out in a water test with the tech and see what he says..<br />I don't get it one day she purs like a kitten then won't start at the dock took to mechanic said timming was off fixed that she started now no get up and go to her.<br />I had all the fuel lines check,starter, had all the electrical gone thru after all that..<br />found so called bad oxygen sensor and fixed timing..Thats the whole story as short as it is thats it..

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

The whole long long storry as it is:::::<br />It was running fine no problems. <br />After last season in Oct.<br />replaced manifolds did a whole top end need it last owner did not flush her good after trips{saltwater}<br />reinstalled motor hooked up everything hit reset button as told.<br />She started and ran like a dream.<br />I did 2 offshore trips and 1 bay trip ran great!!!<br />Next morning at the dock she wouldn't start not even turn over..<br />I always hook up to water when starting her at the house.<br />so off to the marine place..<br />Set the timing cause it was alittle off. while it was there no exspense spared told them to look her over to see if anything else looked bad i do not know to much about electrical.<br />They found a bad fuel pump so replaced that and reinstalled hoses and replaced fuel pump.<br />rotor was craked put on a new one.<br />reset distributor/set timing<br />removed and cleaned the mop sensor reinstalled<br />put on a new relay.<br />Now she bogs in a load doesn't cut off just bogs and has no power.<br />Wasn't like this before all it did was not start.<br />Thats the complete and whole story.

 

[Cut n' Jump]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Ahha- map [manifold air pressure] sensor. Make sure the hose isn't soft and sucking in under a vacuum or pinched shut. Maybe the sensor is bad. Try unplugging the hose and see if it floods the engine like a choke stuck shut. That would show its working. See if it runs with the wire to the sensor unplugged. Does it make any difference? I'm not sure what it could be- just throwing guesses. Maybe they set the timing wrong??? The computer advances the timing so there should be a way to disable the computer advance while adjusting timing. Check all the ground wires! I'd bet its something real simple.

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Cat n Jump,<br />I just have got back from kemah so here is what I do know so far..<br />1.No codes tried different computers in front of me.. This tech guy seems to really know his stuff ..<br />2. compression is alittle high but, that is great he says better than Low ..<br />3. motor getting flooded by gas ..<br />he did set the timing right by the compter for me so the first place was way off according to him.<br />That was making it rev up. Now ok. and my stupid rotor was fine!<br />Tomm..<br />He is taking the fuel system apart and checking the inline [mop sensor that they supposedly replaced at the other.] because from what he has seen so far from the parts I kept the rotor did not need replacing and the oxygen sensor was just fine he checked both very well.<br />So I feel she is going to be fixed and I will never take her back to the first place again!<br />I all things considered and hoping to be back on the water fri. Thank goodness.<br />I printed this out and took it with me for the tech guy to see and he actually looked for all this he was kind of at a loss also.<br />But, he did tell me alot of these newer engines will not code not often but, happens..<br />So it is fuel related ..<br />I will keep updated on this on here in case anyone else has a problem like this..<br />Thanks to all the comments you have no idea! how much I thank you,<br />Houston

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

I have a Question for anyone?<br /><br />What would cause a boat not to code? He tried 2 different computer hookups and nothing.. Is it possible my brain has gone bad on the boat?<br /><br />2. Could this possibly be the sensors or the ECM [electric control module] ? Since it does send a signal out to the fuel injector system..<br /><br />I am running all this by the meachanic this morning when they open up.<br /><br />To answer yours yes the MAP sensor. It is getting gas but, way to much .It seems as though something is telling something that it needs more . It should shuts off auto and it does but, while it is on the jets are spraying way to much.<br /><br />Man these newer volvo's are a pain in my butt..<br />And who said change was a good thing..<br />2 mechanics now and still don't know anything.

 

[qystan]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Computer diagnostic codes only provide info if the sensor is bad. So what is bad? Bad for sensors are usually limited to open or shorted sensors. More complex systems have normal ranges programmed into it and can detect such, like atmospheric pressure sensors and be set to normal pressure ranges (around the 29.92 inch area) and when something like 60psi shows up, it can flag that as bad without the extreme open and short circuit conditions.<br /><br />Exactly what it can detect depends on the design and effort (cost) put into it.

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Thank you that explains alot to me.<br />Now i understand well guess that is the first good news I have had. Well at least the motor itself is in great shape.<br />I am calling them this morning. I met with them yesterday they seem to really know their stuff down there we saw all newer volvo's .. Certifications from volvo etc.<br />+ Kemah is a very high dollar area so I am sure they see alot of problems.<br />Wish me luck.<br />Houston<br />[bold]Exactly what it can detect depends on the design and effort(cost) put into it.[/bold]<br />Well, they are charging me around 70.00 for the diagnostic test n not sure on mechanic fee finding out this morning.<br />If it gets fixed I really do not care the cost because I have actually been out of the water with this for 2 1/2 weeks now.<br />From what i have heard and cookbook tells me it maybe just the ECM on the other hand the sensors seem to be ok so looks like it maybe the EFI pump itself. Which he is checking out today. <br />This board is great my wife actually found it and bookmarked it for me. The suggestions have helped alot. I just hope I can return the favor. <br />Houston

 

[msando]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

my boat is doing the same exact thing. can we please get an update on what the problem was. thanks in advance

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

Afternoon,<br />Well it has been raining here something fierce so they haven't been able to water test it they want to do it under a load. Si I am up in arms for now. maybe I will know more in a day or two if you can hold out that long.<br />They have rebuilt the injector pump this was the last thing. .. Everything else seem to be checking out. <br />My best advise is to find a mechanic that can hang it to a computer and get a readout don't waste your money until you do this part first.<br />I didn't and ended up spending 900.00 dollars at the first place. and still not fixed just patched.<br />Then if no codes show up that means all the sensors are fine..<br />have good communication with the mechanic himself. If not move somewhere else if you can.<br />I will come back here and post as soon as I hear something new this afternoon.<br />Houston

 

[blofish4]

Re: VOLVO 5.7 GSI does not achive WOT**Running Great!!!**

ok I have went and read your other posts.<br />When you accelerate without anyone in the boat but, you does it seem like it will not go on plane ?<br />also what work motor wise have you had done?<br />Have you had it checked to see if the motor is getting to much gas?<br />Does your have a computer on the motor? <br />See my problem was getting way to much gas so thus making me bog down I actually feel like I am pulling a tug boat with mine.<br />My boat is not shutting down it idles and runs great it has a people capacity of 11 but, normally only takes out 6 without a problem until now.<br />Houston