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Forum: General Q & A

06-24-2025, 11:36 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

The factory hit 72 with a 454

The Stingray brochure from 2001 with a 320hp 6.2l (383) did 65mph with a 21” prop ( a good 383 should put out 475 ft lbs torque and 490 hp). So 60 hp for 5 mph is pretty accurate. Be nice to have a...

Forum: General Q & A

06-20-2025, 11:02 AM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Update not reaching RPM

Yesterday at Lake Mead, temperature 110 ugh, I ran a 21” Mercury Mirage SS prop, 60 MPH GPS and 4750 RPM, same load in the boat but hotter temps. Engine ran smooth and flawless. I think I have solved...

Forum: Swap Shop

06-11-2025, 03:10 PM

Replies: 1

Endmar Marine SBC Aluminum Exhaust

Views: 759

Posted By Hotboatwannabe

I am interested. Do you have pictures? Thanks,...

I am interested. Do you have pictures? Thanks, Randy. I’m in Vegas, where are you located?

Forum: General Q & A

06-09-2025, 06:35 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-...

https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/img_0971_b210addba1c0bca2e723037a32c3a1e7b42b7c36.jpeg

Forum: General Q & A

06-09-2025, 06:32 PM

Replies: 0

Fixed!! EFI problem solved mercruiser

Views: 686

Posted By Hotboatwannabe

Fixed!! EFI problem solved mercruiser

Well it was the fuel pump (mostly)! I changed the fuel pump on the Mercruiser 5.7 EFI last week and took it out to the lake on Sunday. I also changed the spark plugs just to be sure. Instant power,...

Forum: Wanted

06-09-2025, 06:28 PM

Replies: 0

Wanted SBC headers

Views: 346

Posted By Hotboatwannabe

Wanted SBC headers

Looking for marine headers exhaust for a small block Chevy water cooled for my 220LX Stingray thanks!

Forum: General Q & A

06-09-2025, 06:18 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Fixed!! Problem finally solved Mercruiser

Well it was the fuel pump (mostly)! I changed the fuel pump on the Mercruiser 5.7 EFI last week and took it out to the lake on Sunday. I also changed the spark plugs just to be sure. Instant power,...

Forum: General Q & A

06-02-2025, 05:34 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Well it’s been all winter and I went to the lake...

Well it’s been all winter and I went to the lake yesterday for a test. This winter I replaced the coil and spark plug wires and if I didn’t mention before I replaced the fuel pressure regulator which...

Forum: General Q & A

11-15-2024, 12:42 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Thanks for the advice, I will do that. The issue...

Thanks for the advice, I will do that. The issue though is the problem is always there and a few times it went away after maximum throttle for at least 1 -2 minutes. And then the rpm “JUMPED” up...

Forum: General Q & A

11-15-2024, 10:48 AM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Update: I ordered a new coil and fuel pump, I’m...

Update: I ordered a new coil and fuel pump, I’m tired of messing around. I’m still trying to find a fuel pressure sensor online. I’ve tested it it to check for a short to ground and it checks out ok,...

Forum: General Q & A

11-13-2024, 07:30 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

You just might be correct. The coil might be the...

You just might be correct. The coil might be the issue, it reads 1.8 ohms primary 9800 secondary. Factory spec is 0.6 to 0.8 primary 9400-11700 secondary.

New plug wires, new cap and rotor. A...

Forum: General Q & A

11-13-2024, 07:16 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

I think it’s a 16 metric thread into the back of...

I think it’s a 16 metric thread into the back of the TBI.

And after wasting $360 at a local shop, (they adjusted the timing and cleared a code and checked the plug wires were correct and also...

Forum: General Q & A

11-12-2024, 06:49 PM

Replies: 0

Ignition, coil, or fuel pressure problem?

Views: 811

Posted By Hotboatwannabe

Ignition, coil, or fuel pressure problem?

I am still having issues with not reaching full rpm, only 4100 and it should be 4800-5000 (tel:4800-5000). It’s the 2001 Mercruiser 5.7 EFI (TBI), New fuel, water, separator, new anti-siphon valve,...

Forum: General Q & A

11-12-2024, 03:50 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Is it a fuel pressure or ignition problem?

Ok, after reading a million blogs I decided to check my ignition coil. Just to recall: 2001 5.7 EFI (TBI) with the older oil filled type coil.Here are the factory specs ( I think) and what my coil is...

Forum: General Q & A

11-11-2024, 10:35 AM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

YES, This is my set up.I do have the #16 fuel psi...

YES, This is my set up.I do have the #16 fuel psi sensor. You are the first person to talk about this, thank you for the insight. Could this be the culprit causing the issue and how does this work?...

Forum: General Q & A

11-10-2024, 10:00 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Good question on the fuel pressure test

You are correct, I should have hooked up the fuel pressure gauge today but I didn’t. First of all, whoever the engineers were who designed this Mercruiser fuel cool system should be fired. How...

Forum: General Q & A

11-10-2024, 06:42 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Lake Test Finally! Ok, this is what I did: ...

Lake Test Finally!

Ok, this is what I did:

New fuel pressure regulator
New anti-siphon valve
New spark plug wires

Boat ran the same as before, like a turd. So it’s not the fuel...

Forum: General Q & A

10-05-2024, 02:53 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Spark and not fuel related?

Yes the symptoms are the same, regardless of prop size until wot for at least 2 mins, on plane, trimmed out correctly, then it jumps up 300 rpm like something just clicked or connected or dislodged....

Forum: General Q & A

10-04-2024, 02:19 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Thank you for the info

I have not run the fuel pressure test under load, but I will. I actually did my own fuel pressure test at my home and the shop said the same thing. I won’t mention this anymore and I appreciate the...

Forum: General Q & A

10-03-2024, 05:14 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

Ok I just double checked the fuel lines and I...

Ok I just double checked the fuel lines and I misspoke. There is NO anti siphon valve in the fuel line pickup from the tank to the fuel / water separator at all. (Factory Mercruiser)

Also there...

Forum: General Q & A

10-02-2024, 06:38 PM

Replies: 31

5.7 EFI TBI sometimes reaching max RPM

Views: 5,422

Posted By Hotboatwannabe

5.7 EFI TBI sometimes reaching max RPM

I am new to this forum but an experienced boater and with good knowledge of the 5.7. I have a 2001 Stingray 22’ bowrider (220LX) stock 260HP 5.7 EFI TBI. New plugs, wires, distributor cap, fuel/water...

Forum: General Boating Discussion

10-02-2024, 06:00 PM

Replies: 0

Mercruiser 5.7 EFI TBI not reaching rpm

Views: 747

Posted By Hotboatwannabe

Mercruiser 5.7 EFI TBI not reaching rpm

I am new to this forum but an experienced boater and with good knowledge of the 5.7. I have a 2001 Stingray 22’ bowrider (220LX) stock 260HP 5.7 EFI TBI. New plugs, wires, distributor cap, fuel/water...

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