Hmmm, I am using decel fuel in MS1, but there is no lower RPM limit setting, so at lower RPM it makes drivability suck. Will look more into this...

lou

_________________
Home of Slant6-powered fun machines since 1988

Yes, he's right. You see a rich condition because the plug(s) didn't fire, and that unburned fuel (plus its O2) is going out the exhaust.

I'm thinking the combination of running ignition now, plus the pickup wire may be coming in contact with something at certain RPMs or conditions where it wasn't before... something like that.

A datalog would be extremely helpful in diagnosing. You would easily be able to see when the reset happens vs. AF ratio. If you can, post it up here and let us look at it. If you like, you can send me the datalog and I can post it.

Lou, the lower RPM limit may be a MS-II thing. I don't remember one on MS-I either.

_________________
It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

I have had this rich/misfire condition foil my tuning on at least one occasion (month or so??) and I know this happened with GunPilot's initial MS slant tuning. You may be super rich across the board...

Lou

_________________
Home of Slant6-powered fun machines since 1988

You might not need to shield the VR wires if you can make them a 'twisted pair' of wires.


If the VR wires are just 2 wires, you twist them (which is what is done in ethernet cables with no shields)

If you have safety-wire pliers, it's easy to twist a pair of wires.......

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

EMS, Can I simply twist the wires together? I do not know what safety wire pliers are. There are just two wires. They do pass by a fair amount of high energy stuff going on around them. Any ideas about a capacitor. What size, and where?

Another thing Peter just mentioned in an e-mail is that I should ground the HEI module with it's own ground wire.
Sam

_________________

http://www.northerntool.com/images/prod ... 646_lg.jpg

Yep, you can just twist them...........

The more twists the better.

read overview and first 2 sections (unless you're a glutton for punishment)

http://en.wikipedia.org/wiki/Twisted_pair

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

How about just chucking up the wires in a drill? Put the other end of wires in a vice. I do that when I want to turn two or three thin strands of mig wire into tig filler.

I thought I saw small rolls of shielded wire at radioshack. I use shielded wire between my VR pickup and the EDIS module. I think I did between the EDIS and terminal box the MS harness leads to as well. If memory serves me right you only want to tie the shield to ground on the MS side, leave the distributor end open.

EMS that was fascinating. I read it all. So it seems the best solution here is a shielded twisted pair. However, it got a little over my head when they started talking about the differences between the various types of shields. I have no idea what the nature of the radiation is that we are trying to shield. I do know that the ACcel harness had a shielded cable for the pick up wires. It was a solid foil shield that was to be grounded. But, I cannot honestly say anyone ever actually grounded the cable. It is the kind of detail that would likely have been overlooked.

In the mean time I will twist the pair. It seems it can't hurt.

Sam

_________________

And isolate them from the spark plug wires, if they are near...

_________________
It's a Slant thing. Even I don't understand.

1974 Duster, EFI /6 soon to be turbo...

Get that Monkay! Get that nasty thing!!

Thanks for all the feedback. I really need smart, generous guys like you around.

I twisted the VR pickup wires, and wire tied them away from possible electromagnetic interference, and moving belts, suspension parts, etc. My gas tank vent hose runs along the frame rail right below the distributor, and this is where I wired tied the VR pickup. It definitely idles smoother. Who would have thought something so simple could make a difference. This is promising. I also grounded the HEI module with a #12 wire under the mounting screws to the engine block. And, I switched over-run cut off "ON" and set the parameters to the suggested ones from Peter.

Any ideas about where and how to put a capacitor filter on the VR wires? Peter pushed a small one into the connector to the HEI module. It looks like a big tick hanging there. One of each leads touches one of the VR pick up leads. I do not know how good the connection is there.



It is still raining hard, and looks to do so for days yet. So until it lets up, I drive my Scion and wait.

Thanks again.

Sam

_________________