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Search: Posts Made By: Jimbo 26
Showing results 1 to 16 of 16
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Forum: General Q & A
04-29-2025, 01:21 PM
Replies: 0
Views: 483
Posted By Jimbo 26

496ho Cam Sensor for Block Code 2XA (2002)

Hi,

I am replacing cam sensor in my 2002 496HO (0M348692) block 2XA. I'm aware that GM made at least three different cam sensor variants for GM build dates in 2001, 2002-2003, and 2004+. Mercury...
Forum: General Q & A
10-31-2024, 09:05 AM
Replies: 40
Views: 16,807
Posted By Jimbo 26

Much appreciated Brad! I just had mine rebuilt...

Much appreciated Brad! I just had mine rebuilt with raylar heads, cam, forged pistons/rods and added o2 bungs. Pros of swapping out PCM555 probably outweigh benefits of reprogramming it. Looking...
Forum: General Q & A
10-30-2024, 12:23 PM
Replies: 40
Views: 16,807
Posted By Jimbo 26

Anyone ever provide a 496 harness?

Anyone ever provide a 496 harness?
Forum: General Q & A
06-08-2024, 11:52 AM
Replies: 12
Views: 2,152
Posted By Jimbo 26

Thanks all for the advice. Anyone have experience...

Thanks all for the advice. Anyone have experience with Mayfair?
Forum: General Q & A
06-08-2024, 05:40 AM
Replies: 12
Views: 2,152
Posted By Jimbo 26

Hydraulic Steering Durability: Zeiger Mayfair or IMCO

Hi All,
I'm installing hydraulic steering on my 2003 Donzi 22c bravo x and am looking for manufacturer recommendations. I know they all are good, but want to get an idea on durability. IMCO, Zeiger,...
Forum: General Q & A
04-17-2024, 07:28 PM
Replies: 3
Views: 3,390
Posted By Jimbo 26

Raylar heads vs HP3 heads…what to do

Hi, I am rebuilding my 496ho. Forged pistons and rods are a given. I have a modified intake from raylar and will probably go for their 203 cam as well. My predicament is whether to spring for Raylar...
Forum: General Q & A
03-14-2024, 09:32 AM
Replies: 3
Views: 704
Posted By Jimbo 26

Got better scope shots of cylinders today. 6...

Got better scope shots of cylinders today. 6 cylinder is making 190 psi but it doesn’t look bad. Looks similar to the good cylinders. Top of 8 looks to be caked in oil or carbon. 8 is making 180 psi....
Forum: General Q & A
03-13-2024, 11:30 PM
Replies: 3
Views: 704
Posted By Jimbo 26

496HO high compression in #6 and #8 cylinders

Hello, I ran a compression test on 2003 496HO in Donzi 22C and found #6 and #8 cylinders at 190 psi. Not sure what could cause this other than carbon buildup, worn cam, or stuck exhaust valves which...
Forum: General Q & A
06-07-2011, 01:06 PM
Replies: 2
Views: 715
Posted By Jimbo 26

Thanks for the advice, Jim

Thanks for the advice,

Jim
Forum: General Q & A
06-06-2011, 11:11 AM
Replies: 2
Views: 715
Posted By Jimbo 26

496ho Lean burn

How long does it take to lean burn a 496? I have a 496ho and a bonehead mechanic. Last summer, I noticed the engine was only getting 4300-4400 rpms turning a 25p mirage plus. Usually, it does about...
Forum: Prop Talk
04-12-2011, 10:05 AM
Replies: 4
Views: 2,556
Posted By Jimbo 26

'03 Donzi 22C Turbo 1 Propeller Size?

Hello,

I have an 03 Donzi 22c with the 496HO/Bravo setup. Porpoising has been a bit of an issue with the current Mirage Pluse 25p propeller. I've read that the turbo 1 prop is a better...
Forum: General Q & A
09-21-2010, 04:52 PM
Replies: 5
Views: 5,544
Posted By Jimbo 26

Looks like that regulator is the one on the...

Looks like that regulator is the one on the bottom side of the engine. I will also try that this weekend.
Forum: General Q & A
09-21-2010, 04:24 PM
Replies: 5
Views: 5,544
Posted By Jimbo 26

Pachanga, Do you recall, which fuel pressure...

Pachanga,

Do you recall, which fuel pressure regulator it was? there is one on the fuel rail and I believe there is one on top of the high pressure fuel pump where the fuel cooler is located (by...
Forum: General Q & A
09-21-2010, 02:58 PM
Replies: 5
Views: 5,544
Posted By Jimbo 26

496HO Mayday: Low fuel pressure, poor idle, surging, low WOT RPM, IAC Hiss

Hello,

I have an 2003 donzi with a 496 ho giving me some trouble. Idle rpms are fluctuating as the IAC sounds like it is contantly opening and closing (loud hiss). Fuel Pressure at the Schrader...
Forum: Do It Yourself, Boating on a Budget
09-17-2010, 01:14 AM
Replies: 4
Views: 1,920
Posted By Jimbo 26

Boat might have 200 hours on it. At closed...

Boat might have 200 hours on it. At closed throttle, the exhaust note is definitely not what it is typically. If I had to describe it, it sounds like it is running cold, maybe one cylinder missing,...
Forum: Do It Yourself, Boating on a Budget
09-13-2010, 02:46 PM
Replies: 4
Views: 1,920
Posted By Jimbo 26

Fluctuating Idle, IAC hiss, low WOT RPMs

Hello,

I have an '03 donzi with a 496 ho giving me some trouble. Idle rpms are fluctuating as the IAC sounds like it is contantly opening and closing. There is a pronounced hiss. When I give it...
Showing results 1 to 16 of 16


 
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