Question for someone running the older Electroair system

[Jbon]

Okay, I got out to the airport to day to troubleshoot further. I checked the EIS timing and found it to be right on the money.

So. . . What say you? Do you think the problem is likely the coil(s). FasGlas, I believe you said these coil towers are stock automotive parts. Do you happen to know what they came off of, or a part number? If they're Delco coils, do you recommend buying OEM, or is whatever Autozone sells okay.

To refresh your memory, the issue is a 150+ RPM drop when running on the EIS, coupled with some roughness. I've replaced leads, and swapped the plugs. Neither helped.

Thanks!

[flyboy1963]

....so, what does ElectroAir say about all this?
A pretty good resource one would think.
Mike Kobylik was the tech/sales support guy at the time, and answered my emails quickly and at length to help me with my 10-year old used purchase!

http://www.electroair.net/

[Jbon]

I've been in touch with them. They seemed pretty sure the new leads were going to solve the problem. I'm going to put a call in to them tomorrow, but I'm interested to hear what the experts here think. Especially if I can obtain replacement coils locally.

[FasGlas]

I'm out of town for a few days but I can give you a quick answer on the coils. I replaced mine with MSD coils (Red) for a bit more kick. You can get those at any hot rod store or online. They are just GM coils, look in the MSD catalog and match them up. There's only one that fits so no worries. Or take your coil to any auto parts store and they will match it up with the OEM equivalent. They don't cost much.

[Jbon]

http://https://www.msdperformance.co...eet/parts/8224

Originally Posted by FasGlas

I'm out of town for a few days but I can give you a quick answer on the coils. I replaced mine with MSD coils (Red) for a bit more kick. You can get those at any hot rod store or online. They are just GM coils, look in the MSD catalog and match them up. There's only one that fits so no worries. Or take your coil to any auto parts store and they will match it up with the OEM equivalent. They don't cost much.

Thanks. Is this the MSD coil I need?

https://www.msdperformance.com/produ...eet/parts/8224

It's the only 2 tower coil I see. Is this a direct replacement?

[Jbon]

Well, I spoke to Electroair this morning. They don't think the problem is the coil. They think a lean carb mixture is the culprit. It's true that I've had an issue with lean mixture. . . not getting the prescribed 35-45 RPM drop at shutdown. I wouldn't have thought a lean mixture would manifest itself in a high RPM drop/roughness at run up, but apparently, because of the higher energy spark, and its longer duration, they have seen it cause exactly this problem.

though I believe my idle mixture is a bit lean, it shouldn't have an affect on things at run up RPM.

[SHIPCHIEF]

I can share a recent experience with such a mag drop:
I sent mags & harness in to Magneto services for the 500 hour inspection, and the harness was condemned and replaced. The new (Teledyne) harness had a flaw, it went to ground inside the lead to the top plug on #6. (replaced under warranty)
Here is the share part;
Start and run the engine on the EI only, then after a minute or so, shut it down and check the cylinder heads for heat (by hand). In my case, the #6 cylinder was ambient temperature, the other 5 were toasty warm.
You may have a single cylinder that is not firing. Once you identify which one, then the component search is easier.

[vic syracuse]

If it's a coil you will have 2 cold cylinders. If only one cylinder is cold, then it is the wire.

Vic

[lr172]

You can also put your timing light on each plug wire. The strobe only flashes if the plug fires. You can also see intermitency this way. If the strobe loses it's rhythmic flash (best to point at TDC mark to observe this) you are intermittently not firing the plug. Bad wires and plugs sometimes present this way before complete failure. When the resistance gets right to the edge of being too high to fire, they often fire intermittently.

Larry

[Schmeddz]

I haven't checked into the forums for a long while and just saw this.

But.... Everything you need to understand the Old Jeff Rose system is in this manual. It was an Electromotive HPV-1 system.

The voltages are reading from the unit, and you can get under the MAP sensor and check your settings on the ignition with a volt meter.

Checking spark you can spin the mag timing wheel and spark will jump between the posts. I would not recommend that you get near those because coil fired amperage is dangerous. (There, I said my safety piece.)


Check the link below for information.
http://electromotive.com/wp-content/...15/05/hpv1.pdf