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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
Fellow marine mechanic I have a 5.7 mercruiser no spark at
Hi fellow marine mechanic I have a 5.7 mercruiser no spark at plugs but plenty coming from coil it is bravo I have new cap btw it's a flat top cap new button leads are fine and I'm replacing the Hall … read more
Noel Schembri
Noel Schembri
Marine mechanic
Diploma
1,804 satisfied customers
I have a 4.3l mercruiser with 2bbl mercarb that dripps fuel
I have a 4.3l mercruiser with 2bbl mercarb that dripps fuel when warmed up and engine is off. Is it the carb or too much pressure from the fuel pump? … read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,556 satisfied customers
I have a Mercruiser V8 1990, rebuilt with new Mercruiser long
I have a Mercruiser V8 1990, rebuilt with new Mercruiser long blocks in 2003. The motor warmed up , then stalled. It will not start, there's no spark. There is 12.5 volts at the positive side of the c… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have a 1989 Cajun with 5.0 , alpha one ,Thunderbolt Ignition.
I have a 1989 Cajun with 5.0 , alpha one ,Thunderbolt Ignition. About three weeks ago I de winterized the boat. After starting it ran fine for several minutes and I started it several times with no pr… read more
K. Kergan
K. Kergan
Marine Mechanic
Vocational, Technical or Trade Scho
1,031 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
im going to replace my mercruiser 4.3l 1990 (175hp) distributor
i'm going to replace my mercruiser 4.3l 1990 (175hp) distributor thunderbolt iv with a delco voyager est marine electronic, is there any position that i have to place the engine or just take the exist… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
my boat is giving off a popping noise. i changed the fuel/water
my boat is giving off a popping noise. i changed the fuel/water filter but its still doing the same. any ideas? 1999 searay mercruiser 5.7 L thunderbolt… read more
James
James
Marine Mechanic
4,111 satisfied customers
I have a 1990 Cobia Monte Carlo 4.3L mercruiser 4bbl 205hp.
I have a 1990 Cobia Monte Carlo 4.3L mercruiser 4bbl 205hp. Yhis season it has had issues starts right up idles fine after running less than 5 min. it starts bogging down, like fallin on its face over… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,556 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
Marine Mechanic
4,111 satisfied customers
I have a 2002 4.3 GM thunderbolt mercruiser-it will not start-
I have a 2002 4.3 GM thunderbolt mercruiser-it will not start- I thought it may have water in the gas -I removed gas filter and found a few small drops of water -I replaced the fuel filter with a new … read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,556 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 230 w/ thunderbolt IV ignition and I am
I have a Mercruiser 230 w/ thunderbolt IV ignition and I am not getting spark. I have 11.94 volts on the + side of the coil and have replaced the rotor, cap & ignition sensor because I saw alot of cor… read more
James
James
Marine Mechanic
4,111 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
My 454 magnum, 1990 will start and seems to run fine to about
My 454 magnum, 1990 will start and seems to run fine to about 2500 rpm. then it has severe backfiring. I have checked/replaced fuel and water filter, plugs, distributer cap. I have not checked/replace… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,392 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
I have a 1990 4.3L Mercruiser 175hp. Before season I replaced
I have a 1990 4.3L Mercruiser 175hp. Before season I replaced spark plugs, distributor cap, rotor, coil and wires. I also replaced both fuel filters (on fuel pump and in carb). It has the Tunderbolt I… read more
Mike of Pompano Beach
Mike of Pompano Beach
Charter Fleet Maintenance
18 satisfied customers
Hi, I have a 1995 Mercruiser 4.3L lx IV thunderbolt ignition.
Hi, I have a 1995 Mercruiser 4.3L lx IV thunderbolt ignition. Motor operates great cold at full throttle, 20 mins later the rpms bounce all over the place over 4000 rpms. I have replace carb, had a sp… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
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