Bad Hub Magnets - 1998 Mercury Mariner 175hp 2.5 V6 EFI

[Soporific]

Ha Ha ... so do I. the problem is that the hub magnets are bad.

[Dave S]

Sorry.... Dave S. has been lost in the weeds......

[PanRonnie]

I am not hell bent on anything, in fact, if I could get some of the dealers around here to even call me back with a price for 271-859238T16, I might have already sold the farm and bit the bullet with a new flywheel. I am not trying to reinvent the wheel. Maybe I am too cheap or just frustrated to see parts discarded for some minor defect that you can't even see. Either way, I don't think I will be trusting another flea bay flywheel. Other than that, not much choice around here. Spend a year hunting to find one really cheap or free? I don't want to wait that long. Am I curious to see if I can easily mod the trigger coil assembly ONLY, yes, definitely, but not if I can get a reasonable replacement flywheel.

you have a scope
you can tell right away if it,s bad from the signal

[Soporific]

you have a scope
you can tell right away if it,s bad from the signal

Yes, I sure can in a short time too. Then the problem is how do you get your money back??? Lost return shipping etc. Buyer beware stuff. If it was a cheap part then, no problem, keep buying until you get a good one.

[PanRonnie]

2009 but might still work

[Soporific]

Thanks for the information PanRonnie, I will follow up with that.

[InjectorService]

Lots of interesting stuff here, I think I'm going to go scope a trigger now. One question, if you put a inductive tach/timing light on your plug wires, because it is "double firing" would you see an increase in RPM? I assume you would, and I have come across a few situations of erratic timing light RPM, even though I have strong spark. Maybe this has been the issue as well?

Also what are you guys using for a scope? Ive been looking for a better setup.

[Soporific]

The first pic is a cheap and basic $30 from china, 2 channel scope from ebay which needs a laptop to display and I have an old dell for that.

The second pic is a fast old TEK, $150, 2 Gig. samples per second, 500 Mhz, 4 channel scope that I shot the trigger coils with on this thread.

The third pic is a digital RIGOL $350, 50 Mhz, 4 channel scope that I have used to test spark plug coils etc.

I also have a couple of DC probes that measure up to 10 amps to also test various coils etc.

They could all do the job for the trigger signal. The TEK displays what the probes pick up and the digital Rigol displays a representation of what the probes pick up but has lots of memory and the TEK has limited memory. The cheap scope stores it on your computer, but it is not fast and very basic, plus you need to use your laptop so a little more inconvenient to set up. There is some experience to get the set up right to capture a good signal, but there are lots of instructional videos for that. There are also pretty competent scopes for $100 on ebay so one for every budget.

[Soporific]

Thanks PanRonnie, I ended up buying a wack of parts from Bullet123, who is liquidating his stock and closing his shop. He has a thread in the buy and sell.

[Soporific]

Update: So customs held up my shipment of parts and I just now have them to test and I have tested both used flywheels with good news to report. Pictured below is how the trigger signal to the switch boxes should read at idle speed. Even, about 6-7 volts and only single clean spikes for each of the six cylinders. A beautiful sight if you recall my other hub magnet signal at the start of this thread.


For clarity,

channel 1 is for trigger coil #1 and fires cylinders 1 on the up spike and 4 on the down spike.
channel 2 is for coil #2 and fires cylinder #3 on the up and #6 on the down
channel 3 is for coil #3 and fires cyl #5 on the up and cyl #2 on the down

As you move from left to right the firing order is 1,2,3,4,5,6.

Also note that this new pattern is with my original trigger assembly, the same as before so the new pattern is from the hub magnet in the new to me flywheel from Bullet123.

[Soporific]

Many thanks to Bullet123 for the great packing and shipping of good parts to me. It is nice to deal with honest people.

[Merc 2.5]

Yep bullet123 is a good feller , i gots lots and lots stuff from him. Almost 2 full rebuilds.

[H2Okie]

I marked up your oscilloscope screen shot picture showing per 1 engine revolution and the trigger firing per cylinder and associated degrees (area inside the orange lines )for clarity to make it easier to decipher what's going on with the trigger firing for anyone interested .

[InjectorService]

Are those 2 signals (the ones in the beginning of thread, and the end) done on the same scope? The last one is WAY crisper!