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I have a boat with a mercruiser 4.3 thunderbolt. It will not
I have a boat with a mercruiser 4.3 thunderbolt. It will not fire. I have checked spark plugs and they are fine. replaced distributor cap, rotor and coil.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a mercruiser 4.3 with a 2bbl carb, it has a
I have a mercruiser 4.3 with a 2bbl carb, it has a thunderbolt IV module, is it necessary to set the module to base to check the timing or is is it just the thunderbolt V that needs to have a jumper w… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 1987 454 mercruiser (Alpha) with a thunderbolt IV
I have a 1987 454 mercruiser (Alpha) with a thunderbolt IV high energy ignition. I was out on the water and everything was working well until it shut down. I checked the coil and no spark. I changed c… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
1996 mercruiser webber carburated 7.4l thunderbolt 5 bravo
1996 mercruiser webber carburated 7.4l thunderbolt 5 bravo 1, is breaking up over 4000 rpm. almost feels like its starving, but not sure. I replaced the spark plugs, distributor cap & rotor, new wires… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
hi i have a mercruiser 4.3l 1990 175hp with thunderbolt iv
hi i have a mercruiser 4.3l 1990 175hp with thunderbolt iv and mercarb, it was parked for 1.5yr and i tried to start but nothing happpened, i replaced sparkplugs, distribuitor cap, rotor, starter, new… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 1997 Larson, with a 4.3 LX Gen+ Mercruiser. The boat
I have a 1997 Larson, with a 4.3 LX Gen+ Mercruiser. The boat sat for three years and I had a shop go through the boat and the replaced various items. They replaced the fuel pump and put a new carbura… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have twin 454 MIE 7.4L MerCruisers in a 1992 Sea Ray 370
I have twin 454 MIE 7.4L MerCruisers in a 1992 Sea Ray 370 Sedan Bridge. Both are original and run great. 1,000 hours each. My starboard engine occassionally stalls at idle either before pulling away … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 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
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have a Mercruiser 185HP 3.8L, when engine is cold it starts
I have a Mercruiser 185HP 3.8L, when engine is cold it starts and runs perfectly. Run it for 30 - 40 minutes and when you shut it off it won't start again. Eventually you keep turning it over and over… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a 93 boat with a 2 year old 5 litre inboard chev engine.It
I have a 93 boat with a 2 year old 5 litre inboard chev engine.It has a merc outdrive with a 19 pitch prop,no power out of the hole good top end,just put new 45,000 volt coil onstill didnt fix,is it m… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 1986 century boat / with a mercruiser 350 cu 4bb
I have a 1986 century boat / with a mercruiser 350 cu 4bb carb. and a thunder bolt ignition system . it has always run file but, today i ran boat in the lake for about an hour and a half . I felt the … read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hi I have a 96 5.0 mercruiser engine. Engine is cranking
Hi I have a 96 5.0 mercruiser engine. Engine is cranking and have no fire. not a fuel problem. distribtor and rotor looks ok. I am leaning toward the coil or electronic module that is attach to the ba… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 95 MerCruiser 5.7, Thunderbolt IV, Serial #OF367661,
I have a '95 MerCruiser 5.7, Thunderbolt IV, Serial #OF367661, and Weber carb. This motor has a serious issue. It will start and run fine for a little while, then start missing out bad. It usually sta… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 1993 Chaparral 220 Sunesta deck boat with a 5.0 liter
I have a 1993 Chaparral 220 Sunesta deck boat with a 5.0 liter 205 hp V8 with a 4 barrell Rochester carburator. I am having engine performance problems under load. With one person in the boat, she com… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I have a 92 Crownline boat with a MerCruiser 4.3 LX / V6 Alpha
I have a '92 Crownline boat with a MerCruiser 4.3 LX / V6 Alpha One engine with Thunderbolt IV Ignition - it is destroyed due to cracked Manifolds. I have found a rebuilt ready to drop in 4.3 litre (n… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine
Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine equiped witha thunderbolt IV ignition and would like to know if there is a correct procedure to time the motor due to the type of ignition.… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 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
249 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
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

1,074 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

18,955 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,406 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,730 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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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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