Paul I am not sure of any ROCK AUTO listing per which coil they are using. I will spill the beans, I was buying the new coils thru AC Delco for a darn great price plus they were OEM on the 496 AUTO / RV / Marine side during that timeframe. I can not remember the part # thru AC delco for that coil but with Mercruiser you might have the second gen coils on already depending on Serial # run. Also I still see 496's but not like I use to as I have down sized hugely. there would be times I would see 20 496's per week during heavy time boating season. twice as many Merc than Volvo apps.

Are you in USA or abroad ? For some reason I think you live overseas. I have a really good memory but sometimes it can confuse me. LOL.

Nothing's wrong with your Memory BUB yes I am in England and thanks for that imfo . Having trouble getting into the marine section on the rock site but will post part # when I get in . Cheers

that's ok If I recall I think ROCK AUTO uses a lot of Standard Brand parts. I have not looked at as of yet but really could care less what they sell. I have my own deal with XYZ distributors and part suppliers. I try to always stock & use the better parts. I say try.

My garage at the house is a mini boat tools and new part supply house persay. I think I might have 2 new of the AC Delco brands on the shelf here. When I get a chance to pull them I will post or pm you what the heck the #'s are. I have had good luck with them thru the past ten years.

Glad my memory is still ok because when that goes so does everything else. just saying.

Thanks again BUP, you've been most helpful.

I'm just throwing this out as a suggestion. Since you mention that there was a storm in your area and it appears that lighting may have caused your problem - you may want to speak with your insurance company. Our home was hit by lighting and it knocked out a number of high priced electronics -- paid the deductible and purchased all new items. I don't know if your boat policy would cover this - but is sure would be beneficial to look into- and who knows a "lot of components" may need replacing!!

all the best

3pointstar

Oh I am so sorry I just notice that one of my posts did not POST. It was # 4 and # 4 showing should have been # 5. I did not even realize it till now. Stupid me. Anyways I wrote - not knowing how you store your boat especially during a storm and or a lightening storm.

Well Lightening itself could have been what knocked out your computers both at the sametime on your twin app engines. I did not know about the storm at first as you just mentioned pwr surges. And I did mentioned if you have insurance, I would look into filing a claim if that was the case but again do not know how you store the boat and and if you did had a lightening strict at your boat or even very close by. Also you might need an expert to back this up for you to win your insurance claim.

I can post more info all about this but will need some info from you as well ie: like how is your boat wired for battery pwr and do you have battery on / off selector switch(s) and was it off that nite and so on

Sorry I made this post longer than it was - the first time around but did not get posted like I said. Post 15 brought up some good info and that's when I went back to look as I thought I said some of the same stuff already. Good luck.

BUP check your insurance policy-- you may have coverage for such events. From my experience you may be entitled to change out a number of electronic components that could have been indirectly effected for the small cost of the deductible. I'm not at all implying to fraud the insurance company -- NEVER DO THAT-- but we all know electrical issues - especially with lighting - can go beyond the obvious. Our home was hit by lightening - I have a Hammond Organ that wasn't directly hit but had a few minor items noted a couple of weeks after the strike. When the adjuster finished with this, the only thing that wasn't replaced was the wood cabinet. For example, my Leslie speaker was sent to CBS in California to be re-worked for some blown out tubes- way beyond what I would have personally done. As a side bar some of these lighting issues take more than a couple of weeks to show up. About 6 months after the strike our TV started acting up - this was simply replaced by insurance.

So if you are having gremlins within the electronic controls of your engines - a complete replacement doesn't seem out of line.

Good luck!!!

3pointstar

3pointstar

I chased soot on the transom on starboard side forever. Ended up changing out coils on 1 cylinder that was intermittently firing. soot-no soot-soot-no soot....It was a bad harness. Problem solved-clean transom-runs great

I just dont get it.. I had a 24x7 hull that came with a 454 mpi.. It lasted 3 years at usually 3500 rpms and each day i took it out , ran it up to 44-4800 rpm's for about 3 mins.. Rebuilt it and it lasted 3 trips.. Next was a 496 HO and it lasted 2 seasons.. Now I have a 2001 25 ft cruiser with the original 220 hp carbed 5.0 I bought it 2 seasons ago . As soon as we get out of the no wake its WFO at 4800 rpm's for 15-20 mins and same on the way back.I keep thinking the motor will blow so I can put in a 383 but nope... It Keeps on going.. We have taken it to Bimini from Miami several times.. Whats up with the new Hi -Tech motors.. They suck..

Chris

As far as SOME failures for EFI / MPI marine engines it has to do rich or lean fuel mixtures, Fuel injectors can become a problem because of the fuel today plus water / corrosion and debris issues. Sometimes their spray patterns will be off or stuck open or stuck closed or drip even after shut down causing these issues.

Next is the fuel regulating and or its bypass problems in which some will dump excess fuel back in the intake and or down in whatever cylinder, causing hydro lock problems or washing the cylinder wall(s) down or over time diluting the motor oil once its gets past the piston rings.

Next is electric fuel pumps issues they hate heat, debris and water / corrosion. Also in marine apps 99%, the electric fuel pumps are mounted externally and X amount of distance away from the fuel tank - electric fuel pumps rather push fuel rather than pull it. This causes heat and cavitation plus ONE of the things that contribute to vapor lock.

Next is ground issues so many more persay electrical components than carb engines. All electronics hate vibration, high heat, moisture, corrosion and so on.

There is more but here is the basic jist of why sometimes.