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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 1992 mercrusier 7.4 with thunderbolt IV ignition the
James, I have 1992 mercrusier 7.4 with thunderbolt IV ignition the engine runs perfect most of the time but sometimes at lower RPM's. below 2000 the volt meter will jump from 13 to 14 and the engine s… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Jeff, I have just bought a project 91 Glasstream I/O mercruiser
Jeff, I have just bought a project 91 Glasstream I/O mercruiser 4.3/V6 w/ Thunderbolt IV ignition . The boat has sat for quiet some years due to previous owner not repairing the original problem of sh… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
Tan, I have to ask the questions again because I had the subscription
Tan, I have to ask the questions again because I had the subscription messed up. I had a second question I think you may have answered to this one. How hard would it be to replace the transom assembly… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
On my Mercruiser 454 I have an oil cooler and a power steering
On my Mercruiser 454 I have an oil cooler and a power steering pump cooler and I want to know if both of these are needed? If they are needed how do I hook up both the oil cooler and the power steerin… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 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
11,504 satisfied customers
1999 mercruiser alpha 3, when shifting into reverse, sometimes
1999 mercruiser alpha 3, when shifting into reverse, sometimes nothing happens, and to avoid a dock crash, more throttle in reverse is added, the result is it goes into reverse very hard. the mechanic… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a Mercruiser inboard outboard engine. It is a alpha
I have a Mercruiser inboard outboard engine. It is a alpha one 1995 serial#OF356761,it has the thunderbolt ignition IV mounted on the dist. The first problem I started having was I would crank and cra… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 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 got power going from my coil to my distributer but no power
I got power going from my coil to my distributer but no power coming out of distributer when cranking motor will not fire. In your opion what could the problem be.… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 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
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
have 454 magnum alpha one. 1987..... overheated, my mechanic
have 454 magnum alpha one. 1987..... overheated, my mechanic said cylinders full of water. cause I shut her down too fast. is that possible… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,556 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
hello; i own a 1987 searay with mercruiser alpha one ! everythin
hello; i own a 1987 searay with mercruiser alpha one ! everything was fine last year , but now when i put the gear shift lever into reverse with the earmuffs on the engine stalls ? do you think it nee… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I am in Alaska and was just getting the boat ready for the
I am in Alaska and was just getting the boat ready for the summer. I have chevy 350 mercruiser engines, Both engines have run this year, the port ran about an hour and just quit. It appears I have a v… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a 1987 Four Winns 245 Vista with a MerCruiser 260 engine.
I have a 1987 Four Winns 245 Vista with a MerCruiser 260 engine. On my last cruise I could not get any power out of my #2 battery. After sitting a month I worked on my boat, testing the batterys. The … read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have a 1990 Lund Big Fisherman boat that needs a new shift/throttle
I have a 1990 Lund Big Fisherman boat that needs a new shift/throttle control and new control cables. It has a 4.3LX/V6 Alpha One engine with Thunderbolt IV Ignition. It is a side mount control on the… read more
ROCKET
ROCKET
MASTER CERTIFIED TECH
Vocational, Technical or Trade Scho
426 satisfied customers
I have a 89 Mercruiser, w/454 engine.(Scarab boat) The boat
I have a 89 Mercruiser, w/454 engine.(Scarab boat) The boat will not start. I have power to the postive side of the coil, but no fire to the plugs. How do I diagnos the ingnition?… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
586 satisfied customers
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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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