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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
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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
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Hello, I have a 1995 Mercruiser 5.7 with bravo 3 and 4 bbl
Hello, I have a 1995 Mercruiser 5.7 with bravo 3 and 4 bbl carb as originally installed in a 20' SeaRay. Won't go above 3400rpm. Bone stock stainless props as delivered new. This is a friend's boat th… read more
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Have a 1994 Baja , Mercruiser 4.3 thunderbolt ignition , Have
Have a 1994 Baja , Mercruiser 4.3 thunderbolt ignition , Have power at the coil ( both sides ) But no power coming out , I have a solid purple wire up near the carb that doesn't go anywhere but shows … read more
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I have a 1990 malibu skier w/a 350 5.7 chevy engine w/
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orcamarine
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im going to replace my mercruiser 4.3l 1990 (175hp) distributor
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Tan
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I have a 1994 37 sundanser twin 7.4 mer eng. The starb eng
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K. Kergan
K. Kergan
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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
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what is the spark plug gap for a 1980 mercruiser 228 (305 chevy)
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my 5.7L Mercruiser ran fine 2 weeks ago. Went to fire it up
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Jason
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I have a 2002 4.3 GM thunderbolt mercruiser-it will not start-
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Whitecap36
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I have a 1993 Celebrity. It had a 5.0 Mercruiser and last
I have a 1993 Celebrity. It had a 5.0 Mercruiser and last year the previous owner installed a 5.7 Mercruiser with a Thunderbolt IV Ignition system with a coil and points. I had problems with last year… read more
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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.
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I have a 1997 Galaxy with a 5.7 Yamaha I/O. Did not do my
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Dominick
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Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine
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mercmastertech
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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
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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
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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
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Meet the Experts:

Dominick

Dominick

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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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