throttle body discontinued

[dharris6811]

Hi all, I have a 2005 Volvo Penta 5.0 GXI-E and it's been bogging down at full throttle. I'm talking about doing 15 - 20 mph in a lake! I've changed the fuel and a ton of parts, plugs, cap, rotor, wires, fuel pump serviced, injectors, all electronical parts on the throttle body, cleaned the throttle body. But I noticed when I looked at changing the throttle body it said discontinued or obsolete part. I was just wondering if anyone knows if they have a substitute? This is strange, I can't imagine they just expect you to buy a new engine if that part failed. Oh, and it's not like I did it all at once, I changed something then tested it. Thanks for your help

 

[alldodge]

Welcome
Ya need to quit throwing parts at it and do some testing.

Have you check compression, fuel pressure, scan for codes, check timing?

BTW it's not the Throttle Body

 

[Lou C]

Did you check the gas tank vent & the anti siphon valve? With fuel system problems start with the basics first.

 

[dharris6811]

Welcome
Ya need to quit throwing parts at it and do some testing.

Have you check compression, fuel pressure, scan for codes, check timing?

BTW it's not the Throttle Body

I forgot to mention I took it to two boat shops and I know compression and fuel pressure was fine. However, I'm not sure about codes or timing.....I guess I just "assumed" they checked. And yes I know what they say about assumptions LOL! I will check ASAP. Thanks Alldodge!

 

[dharris6811]

Did you check the gas tank vent & the anti siphon valve? With fuel system problems start with the basics first.

that I did NOT think about.....thanks Lou!!

 

[Scott Danforth]

If you haven't checked fuel pressure, start there

If you haven't changed the crab cap, do that after checking fuel pressure

You threw thousands of dollars at it and never diagnosed what may be a $10 fix

 

[dharris6811]

If you haven't checked fuel pressure, start there

If you haven't changed the crab cap, do that after checking fuel pressure

You threw thousands of dollars at it and never diagnosed what may be a $10 fix

Hi Scott,
I stated earlier with another member I forgot to mention in my original post I took it to two boat shops and they did check the fuel pressure and compression and said everything looked good. The first shop suggested changing the plugs, wires, cap and rotor, so they did that. When the boat still bogged I took it to a different shop (both had good reviews) and they rechecked the fuel pressure and compression then told me the fuel pressure regulator screen had a few paint chips in it. He went on the tell me that earlier Volvo fuel pumps had been painted on the inside and recommended I send the pump in to a company that removes all the paint from the inside of the pump. I did that but it still bogged down. That's when I thought the paint could have plugged a couple of the injectors so I replaced them, yea that was pricy. When that didn't change anything I changed the throttle sensor (cheapest change). Believe me, I tried taking the cheapest rout with pro boat mechanics.....I'm just at a loss. I'll see if I can edit my original post. Thanks sir, Dave

 

[alldodge]

We're a DYI place, so we really need to see real numbers
We all do the quick response (me mostly) you need to do this, kind of thing

Shop A saying all was good means nothing when shop B says a couple paint chips leads to paint removal, new injectors and still have same issue(s)

So your out a lot of coin and have same problem.

Has the motor been scanned for codes?

I'm not a VP guy because while they are good motors when there is a problem, cost are high and finding a Tech that "actually" know what they are doing is very hard to find

I would really like to know what the fuel pressure is from idle clear up to WOT. The rail pressure should be 50-60 psi through the full range

Old guy here so bare with me, but seem to remember there is service bulletin about timing and bogging. Wonder if anyone checked to make sure timing is correct? Timing is not done with a timing light

 

[ESGWheel]

If you do not have one already here is a fuel pressure tester that will work link Others exist that may be a little cheaper….

 

[dharris6811]

We're a DYI place, so we really need to see real numbers
We all do the quick response (me mostly) you need to do this, kind of thing

Shop A saying all was good means nothing when shop B says a couple paint chips leads to paint removal, new injectors and still have same issue(s)

So your out a lot of coin and have same problem.

Has the motor been scanned for codes?

I'm not a VP guy because while they are good motors when there is a problem, cost are high and finding a Tech that "actually" know what they are doing is very hard to find

I would really like to know what the fuel pressure is from idle clear up to WOT. The rail pressure should be 50-60 psi through the full range

Old guy here so bare with me, but seem to remember there is service bulletin about timing and bogging. Wonder if anyone checked to make sure timing is correct? Timing is not done with a timing light

Thanks Alldodge! yea it's really frustrating. I'll call them and see if they kept my numbers and if they did a scan for codes. I'll also check with the timing and give ya all an update. Thanks again, Dave

 

[jimmbo]

Give me a Carb any day over EFI, so much easier to understand and troubleshoot, unlike Voodoo Electronics

 

[Lou C]

Give me a Carb any day over EFI, so much easier to understand and troubleshoot, unlike Voodoo Electronics

And the aftermarket provides all the parts unlike the shady OEMs!
Even for a 35 year old Quadrajet!

 

[Scott Danforth]

I'll call them and see if they kept my numbers and if they did a scan for codes. I'll also check with the timing and give ya all an update. Thanks again, Dave

seriously doubt they will have kept anything

run a compression test yourself, post the numbers here
check fuel pressure yourself while under load and post the numbers here
get a factory manual from here https://www.volvopenta.com/en-us/service-and-support/your-engine/manuals-and-handbooks/

if you want to scan your own. go here https://www.rinda.com/marine/marine.htm

 

[dharris6811]

seriously doubt they will have kept anything

run a compression test yourself, post the numbers here
check fuel pressure yourself while under load and post the numbers here
get a factory manual from here https://www.volvopenta.com/en-us/service-and-support/your-engine/manuals-and-handbooks/

if you want to scan your own. go here https://www.rinda.com/marine/marine.htm

yea I called this morning and they didn't keep the numbers. I'll get a pressure tester, take the boat to the lake with a buddy and get both idle and under full power for both low and high side. I didn't realize I could run my own codes....you guys are awesome!! I'll let ya know

 

[Scott Danforth]

Compression numbers are run with plugs out and cranking

Fuel pressure is checked with engine off, key on, engine running at idle, and engine running at full out WOT

 

[Donald0039]

yea I called this morning and they didn't keep the numbers. I'll get a pressure tester, take the boat to the lake with a buddy and get both idle and under full power for both low and high side. I didn't realize I could run my own codes....you guys are awesome!! I'll let ya know

Get the Diacom and a small laptop to read the codes and about anything else the ECM can tell you. A lot of marine mechanics use a Diacom.

Maybe get a 6 gallon tank with some gas and connect that up to test for fuel issues.