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Scott06 replied to the thread Carb tuning.

one or both throttle plates may be upside down and not closing. Are you setting idle speed with the throttle cable disconnected? Are...

May 20, 2026
Scott06 replied to the thread Mercruiser 3.0L choke adjustment.

The mercarb is a descendant of the rochester 2 jet so yes uses a vacuum piston in the choke element housing. Very similar to the holley...

May 20, 2026
Scott06 replied to the thread Carb tuning.

I found the same thing with the base gasket. Your edlebrock has the same square and spread bore mounting that my intake does. There is...

May 20, 2026
Scott06 replied to the thread Started out as a good day on the water. 4.3 mercruiser.

The TB module is either mounted to the dist or on the exhaust elbow. Both are black boxes, sometimes with a knock module. just google...

May 19, 2026
Scott06 replied to the thread Mercruiser 3.0L choke adjustment.

choke pull off on a mercarb is inside the choke element housing. Its a piston behind the element vs a separate diaphragm with hose like...

May 19, 2026
Scott06 replied to the thread Mercruiser 3.0L choke adjustment.

you may need to bend the linkage to get it to the correct opening amount not just adjust the element which is more for the amount of...

May 19, 2026
Scott06 replied to the thread Started out as a good day on the water. 4.3 mercruiser.

It seems to be hit or miss with the est modules , also finding an actual delco est is not as easy anymore. Mich Motorz no longer carries...

May 19, 2026
Scott06 replied to the thread Started out as a good day on the water. 4.3 mercruiser.

friggin auto correct... I meant the Merc TB (thunderbolt) is a great system, Merc just screws the owner by NLA or insane ignition...

May 19, 2026
Scott06 replied to the thread Started out as a good day on the water. 4.3 mercruiser.

Why would you replace the ignition system if it’s working? The atB is a great system until the ignition module needs to be replaced $$$...

May 18, 2026
Scott06 replied to the thread 1981 120 mercruiser rough idle.

not that it matters but the Iron Duke engine is a 151 CID Pontiac engine from the 80's, the marine 2.5 are Chevy based 153 CID engines...

May 15, 2026
Scott06 replied to the thread Tinkering on the 4.3l this winter....

25 would make sense as the 4.3 2 bbl is rated at 190 hp, the reman 4.3 with 4 bbl webber eddy is rated 225. I had heard somewhere on...

May 15, 2026
Scott06 replied to the thread I/O (Sterndrive) Conversion to Outboards.

A lot of tire kickers? I just went through selling on of our cars on marketplace, older vehicle for not much money, go so sick of it I...

May 14, 2026
Scott06 reacted to alldodge's post in the thread 3.0L mercruiser compression with Like.

It's fine unless you threw some water and crud in the tank

May 13, 2026
Scott06 replied to the thread 3.0L mercruiser compression.

worth doing as in dash tachs tend to drift over time. if its off you may be hitting correct WOT rpm already.

May 13, 2026
Scott06 reacted to alldodge's post in the thread 3.0L mercruiser compression with Like.

Could throw it back at them Tell them to build you a motor with 180 compression that runs on 87 octane with current prop and drive

May 12, 2026

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