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Search took 0.00 seconds. Search: Posts Made By: mmwjr
Forum: Engines 04-29-2016, 10:54 AM
Replies: 37
Views: 9,013
Posted By mmwjr
I think what you described sounds correct but a...

I think what you described sounds correct but a few pictures would help.

The coil is about the size of a soda can but smaller in diameter. The gray wire is on the negative terminal and goes to the...
Forum: Engines 04-28-2016, 11:08 PM
Replies: 37
Views: 9,013
Posted By mmwjr
No science here, use a gap tool to test spark...

No science here, use a gap tool to test spark they are cheap at an auto parts store.
Forum: Engines 04-28-2016, 11:06 PM
Replies: 37
Views: 9,013
Posted By mmwjr
It's a standard rotation, rev is for a twin...

It's a standard rotation, rev is for a twin application were one engine runs in reverse. These days most twins are both standard and the transmission does the reversing.
Forum: Engines 04-28-2016, 09:31 PM
Replies: 37
Views: 9,013
Posted By mmwjr
Get the Mercruiser manual from the Documents tab...

Get the Mercruiser manual from the Documents tab of this site its #24, there is a section that describes how to test the knock sensor. This manual has looks of info and troubleshooting guides.
Forum: Engines 04-28-2016, 05:53 PM
Replies: 37
Views: 9,013
Posted By mmwjr
Not sure. maybe unscrew it from the block and...

Not sure. maybe unscrew it from the block and plug the hole. you'll then need to ground the outer case of it.
Forum: Engines 04-28-2016, 09:46 AM
Replies: 37
Views: 9,013
Posted By mmwjr
Being a 1999 the engine is equipped with a knock...

Being a 1999 the engine is equipped with a knock sensor so if there is an issuer with the fuel causing a knock the module will retard timing.

Therefore you may want to try running on an external...
Forum: Engines 04-28-2016, 09:44 AM
Replies: 37
Views: 9,013
Posted By mmwjr
Yes you can measure between the positive and...

Yes you can measure between the positive and negative terminals which should be a few ohms. Then measure between the positive terminal and high tension post, which has another value that you'll have...
Forum: Engines 04-28-2016, 09:40 AM
Replies: 37
Views: 9,013
Posted By mmwjr
That will work.

That will work.
Forum: Engines 04-28-2016, 09:40 AM
Replies: 37
Views: 9,013
Posted By mmwjr
Any timing light will do. Separate tach/...

Any timing light will do.

Separate tach/ dewell meter, they were used back in the day when engines had points. It will connect to the battery and coil using clips.
Forum: Engines 04-28-2016, 01:49 AM
Replies: 37
Views: 9,013
Posted By mmwjr
Coils can test good at ambient but when running...

Coils can test good at ambient but when running they get hot and can be intermittent. This will cause a miss that may backfire.
Forum: Engines 04-28-2016, 01:47 AM
Replies: 37
Views: 9,013
Posted By mmwjr
So where in the world are you? Got a Harbor...

So where in the world are you?

Got a Harbor Freight near you? Go buy a cheap timing light and tach/ dewell meter.

The tach gets its signal fron the negative terminal on the coil, gray wire....
Forum: Engines 04-27-2016, 10:30 PM
Replies: 37
Views: 9,013
Posted By mmwjr
If you can hit WOT the timing is probably ok. For...

If you can hit WOT the timing is probably ok. For electrical I would suspect either the coil or ignition sensor in the distributor before the icm.
Forum: Engines 04-27-2016, 10:20 PM
Replies: 37
Views: 9,013
Posted By mmwjr
Have you checked the ignition timing? Thunderbolt...

Have you checked the ignition timing? Thunderbolt V requires a wire to be grounded to set base timing. Google for how to set mercruiser Thunderbolt V timing.

When on the water use the timing light...
Forum: Engines 04-27-2016, 08:42 AM
Replies: 37
Views: 9,013
Posted By mmwjr
The smaller one with two wires is the oil...

The smaller one with two wires is the oil pressure switch that provides power to the fuel pump, the other is the oil pressure sendor that is connected to the oil pressure gauge at the helm. It's...
Forum: Engines 04-27-2016, 08:38 AM
Replies: 37
Views: 9,013
Posted By mmwjr
A miss is when a cylinder does not fire and a...

A miss is when a cylinder does not fire and a backfire is due to a timing issue that results in fuel igniting when the intake valve is open and resultant gases blow back up through the carb. A...
Forum: Engines 04-27-2016, 01:58 AM
Replies: 37
Views: 9,013
Posted By mmwjr
If the initial backfire was when the engine was...

If the initial backfire was when the engine was cold the choke may be a little sticky.

You have an electric fuel pump, that is a safety switch that opens if the oil pressure is low. It's bad and...
Forum: Engines 04-27-2016, 12:50 AM
Replies: 37
Views: 9,013
Posted By mmwjr
So power on the B terminal of the ignition...

So power on the B terminal of the ignition switch, correct?

When holding the key in the start position do you get power on the S terminal?

When the key is in the run position do you get power...
Forum: Engines 04-26-2016, 04:01 PM
Replies: 37
Views: 9,013
Posted By mmwjr
Also the shift cable must be in neutral in order...

Also the shift cable must be in neutral in order for the engine to crank. i.e. shifter in neutral or push button to disengage shift when advancing the throttle.

You probably know this but I have...
Forum: Engines 04-26-2016, 11:43 AM
Replies: 37
Views: 9,013
Posted By mmwjr
Regarding the missing/backfiring: Remove fuel...

Regarding the missing/backfiring: Remove fuel filter/water separator and pour it into a glass jar, let settle and look for water or particles. It sounds like bad gas, how old is it? Was the boat...
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