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New rebuilt mercruiser v6 engine installed .... put in
New rebuilt mercruiser v6 engine installed .... put in rebuilt carb, new ignition module, oil Pump, rotor and cap, installed everything I thought correctly however there is a chance the distributor is… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
1987 sea ray seville, 4.3 mercruiser. was tearing motor down
1987 sea ray seville, 4.3 mercruiser. was tearing motor down because nof cracked block and found camshaft to have no retaining ring on it. what holds the cam in place then… read more
Tan
Tan
MerCruiser Certified Technician
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11,264 satisfied customers
Mercruiser thunderbolt v ignition module part # ***** 1251-1......
Mercruiser thunderbolt v ignition module part # ***** 1251-1...... Where do I buy a new one of these, how do I test the existing one, should I replace coil too. Basically after engine is warm, rpm's d… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
just replaced my spark plugs and distributor cap on my 87
just replaced my spark plugs and distributor cap on my 87 sea ray 260. now getting no spark… read more
Tan
Tan
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I have a 2003 4.3 mpi mercruiser. runs fine below 3000 rpm
I have a 2003 4.3 mpi mercruiser. runs fine below 3000 rpm Than dies. May restart right away or may take 20 min. changed crank sensor and ing sensor. cleaned fuel tank changed filter. Fuel pressure is… read more
Expert-Repair
Expert-Repair
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
11 satisfied customers
i have a mercruiser 4.3 serial no. of 803740 with no fire.
i have a mercruiser 4.3 serial no. of 803740 with no fire. how do u test the control module and the sensor wheel in the distributor to see if they are good or bad.… read more
Tan
Tan
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11,264 satisfied customers
I have a Mercruiser 4.3 V8 mounted in a Regal Valanti 1991.
I have a Mercruiser 4.3 V8 mounted in a Regal Valanti 1991. My question is as follows: Does the engine have adjustable valve clearances on Inlet and Exhaust valves or is the system a non-adjustable hy… read more
Tan
Tan
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I have a 1995 Mercruiser 4.3 LX/V6 Alpha one and im not getting
I have a 1995 Mercruiser 4.3 LX/V6 Alpha one and i'm not getting fire to my plugs. I changed the wires, rotor, Distributor cap, and coil. Any suggestions???… read more
Jason
Jason
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Anybody have a lead on where to purchase an ignition module
Anybody have a lead on where to purchase an ignition module for a Mercruiser Thunderbolt IV?… read more
James
James
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Vocational, Technical or Trade Scho
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have a 1999 four winds boat, with GM 4.3 V6 not getting any
have a 1999 four winds boat, with GM 4.3 V6 not getting any fire from coil. I have replaced thecoil distribator pick up and module , new distribator cap and rotor -still no fire… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
will a 1991 4.3/V6 Alpha 1 mercruiser engine work in a 1997
will a 1991 4.3/V6 Alpha 1 mercruiser engine work in a 1997 bayliner 2052 that had a 4.3/V6 Alpha 1 mercruiser engine that was salt water damaged?… read more
Jeremy R
Jeremy R
1,069 satisfied customers
I have a crate turn key remanufactured 5.7L Mercruiser 357ci
I have a crate turn key remanufactured 5.7L Mercruiser 357ci Magnum Bravo 4V with the Thunderbolt V ignition. The engine cut off out at sea. Failed to restart. Checked for gas = All Good Tried Sprayin… read more
Tan
Tan
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I have a 4.3 v6 mercruiser. It will turn over and start for
I have a 4.3 v6 mercruiser. It will turn over and start for just an instant, but won't run. I tested the ignition and I have spark until the engine starts, then it shuts off. (no spark) Please help.… read more
Jeremy R
Jeremy R
1,069 satisfied customers
I have a 4.3 mercruiser with no spark. Do you have a test procedure
I have a 4.3 mercruiser with no spark. Do you have a test procedure for the sensor in the distributor and one for the module?… read more
Master Tech
Master Tech
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2001 5.7 merc efi cranking but not starting Fuel at throtlebody
2001 5.7 merc efi cranking but not starting?Fuel at throtlebody but Injectors not opening?… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
542 satisfied customers
Hey guys, I have an 03 Mercruiser 4.3 190hp in my boat. I
Hey guys, I have an 03 Mercruiser 4.3 190hp in my boat. I have a problem with no spark going to distributor. Figured that the ignition coil was bad, so replaced it, still nothing. While cranking the m… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
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I HAVE A 1996 MERCRUISER BOAT WITH A TBI 5.7L THE INJECTORS
I HAVE A 1996 MERCRUISER BOAT WITH A TBI 5.7L THE INJECTORS LOOSE PULSE AFTER 400 RPM AND CODE 42 IS SET. IGNITION MODULE OR COMPUTER.… read more
JOES SHOP
JOES SHOP
Vocational, Technical or Trade Scho
204 satisfied customers
Hi, I have a 1993 mercruiser 4.3 190hp in an 18 boat. The
Hi, I have a 1993 mercruiser 4.3 190hp in an 18' boat. The engine runs great until 4000 RPM. Then it starts to backfire. If I have more people in the boat it tops out less than 4000rpm and it doesnt b… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
1,009 satisfied customers
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

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John White

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Jason

Jason

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Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

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Jeff G.

Jeff G.

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Captain Dave

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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