Need Help on 5.8fsi Couple of Issues

[alldodge]

What was the pressure readings when measured?

 

[ChrisinPHX]

I've got a 5.8Fsi. Anti Siphon Valve is the #1 culprit for fuel starvation on these. Clogged pickup tube is #2. ECM relay is #3. Fuel Pressure regulator is #4.
Sounds like it's not limp mode related as in 3 seconds I doubt you're getting to 2,700 rpm.

EDIT - Well since you did mention 2,500 rpm originally. Oil pressure switch is the #1 cause of going into limp mode.

All my # rankings are based on a shared database of Correct Craft owners that all have fuel injected 5.8L Fords with GT40 heads, same as the VP 5.8 Fsi's. Incredibly minute differences in between them.

 

[Briha1978]

Did some progress on the boat tonight.
Bypassed the boat’s tank to a 2 gallon tank. I can see the fuel being pulled to the pump. Boat still starts and runs for 3 seconds and dies. My fuel pressure tester broke so I can’t get a reading. I also hooked up 12 volts directly to the pump while it was running and still the same issue. What else could I try? I’ll see if I can borrow a fuel pressure tester. I have inspected every hose and I don’t see any cracks or cuts. Please let me know.

 

[dubs283]

You need to find out if you are loosing fuel or spark. You say you connected 12 volts to the pump and same results. You mentioned in an earlier post two pumps? Did you 12 volt both? Have you checked for loss of spark?

 

[alldodge]

While it hasn't been verified I would believe its electrical. Fuel pressure should have been maintained by hot wiring. As to what's causing it to stop, nothing is giving a clue. Don't know enough about the system and don't have a manual.

Just found the manual in DonS post at 4shared, I'm looking thru it
https://forums.iboats.com/threads/a...h-the-volvo-penta-omc-5-8l-efi-engine.418397/

 

[Briha1978]

I just gave the constant power to the low pressure pump only. I will check for loss of spark later tonight when I am able to get out there. It’s Texas and it got hot fast here. Thank you alldodge, dubs, and everyone else who is trying to get me back on the water.

 

[Briha1978]

Update. Checked out the hi pressure pump and put 12 volts to it. It works as well. It took some time with turning and priming the pumps and finally got fuel out of both pumps. Still started and died. Well I said wth I took the carb/choke cleaner while it ran because I thought I heard a vacuuum leak. I do. It’s between the throttle bottle and the gasket. When I kept spraying the boat idled for more than 3 seconds. Now to track down the two gaskets. Any ideas?

 

[alldodge]

Go to ling in post 25 and back to the 4shared link from DonS. Says its a parts breakdown for the Fi and Fl

 

[ChrisinPHX]

Between the throttle body and which gasket? The upper and lower intake gasket? The upper to lower gasket is a known leaker, and there are also a number of vacuum lines on the bottom side of the upper intake that are known to leak as well if the lines and caps dry rot. You can't see them without pulling the upper intake. These photos are from an automotive application but you will have different lines and possibly some capped off ports as well. Your setup will probably look slightly different than these.

 

[Briha1978]

Updated? Replaced the throttle body gaskets. TPS, and redid the gaskets for the IAC on throttle body. Boat ran but was surging. But was running with all sensors hooked up. For the hell of it. I unplugged the MAF and wow it ran beautiful. No missing, stalling, or anything. Except it has an idle of 1300 rpm. Also I don’t know what idle speed should be? Any help on where to go from here?

 

[Briha1978]

Chrisin I found out I had an intake leak upper to be correct. I redid the upper gasket yesterday. Like I said now I am running great no vacuum leaks but I have the MAF unplugged and my idle is at 1300 rpm. You were correct about the upper intake leaking.

 

[alldodge]

Idle close to 700

 

[ChrisinPHX]

The MAF sensor is reporting incorrect airflow into the engine. The computer adds the amount of fuel it expects the engine will need, but if it is significantly off, the engine runs poorly.

The hot wire in the MAF sensor is probably dirty. You can Google how to clean the MAF sensor. If cleaning doesn't make an improvement, you may need to replace the MAF sensor.

Have you bothered to pull codes?

 

[ChrisinPHX]

alldodge is spot on with the 700 RPM idle speed.

 

[Briha1978]

Well got two vacuum leaks again. Redid the plenum gasket again. Chrisin is right about these not sealing up

 

[alldodge]

Well got two vacuum leaks again. Redid the plenum gasket again. Chrisin is right about these not sealing up

Were the heads ever milled?
Milling other then a few thousandths can create a need to mill the intake because the gasket is no longer think enough to seal it

 

[Briha1978]

I’m not sure. It seems the lower intake doesn’t want to seal. I redid it yesterday just the plenum so I’ll let you know if I have any other leaks.

 

[ChrisinPHX]

Who's gaskets are you using? Have part numbers? Are you using any sealant in conjunction with your gaskets? Can you pinpoint your leaks using starting fluid or brake cleaner?

 

[Briha1978]

Alldodge. So the TPS was changed due to code 63. The map sensor was changed due to code 22. Now the thing won’t idle. Before the parts. I can disconnect the map sensor entirely. It would run smoothly but idle at 1000rpm. I am seriously at a loss. Good thing is was able to get the codes out of the computer.

 

[Briha1978]

Chrisin. I got the intake to final seal up. Using Felpro gasket.