EDIS Problem after rewire

danG · Post by **danG** » Thu Jul 20, 2006 12:08 am

I have a 95 toyota tercel with a td04l turbo, lots of other mods.

When I initially installed ms and EDIS (I had it running), my wiring wasn't very neat, so me and a friend went back and rewired everything. It looks really good now, all nice and loomed, but I can't get it to start. This problem sprung up after we redid the ignition wiring, but I have been back over the wiring about 100 times looking for problems, and can't find anything wrong with the wiring.

When I try to start it it pops a little, if I flood clear it backfires pretty bad. I pulled al lthe plugs, they are all sparking. Im getting a clean tach signal to ms, and the injectors are all firing. I didn't touch the VR sensor or crank wheel, so I am assuming the timing isn't off. I don't have a timing light handy, but Ill probably get one here pretty soon if I dont solve the problem. The symptoms are leading me to believe it is some kind of weak spark. I tried changing plugs, beefing up the +12v wires, adding/improving grounds... I just can't figure it out.

Im at the point where it makes almost no sense, and I am just staring at it at this point. Hopefully you guys can give me some new ideas so I can stop trying the same things over and over.

Thank you!

Ferret · Post by **Ferret** » Thu Jul 20, 2006 3:00 am

Check if you reversed the HT wires or the wires between the EDIS module and the coil pack.

superchargingmachine · Thu Jul 20, 2006 3:40 am

Yes, I agree it sounds like the wires from the EDIS module to the coil pack are reversed.

danG · Post by **danG** » Thu Jul 20, 2006 11:20 am

Just checked, pin 12 on the module goes to pin 1 on the coil pack, pin 10 on the module goes to pin 3 of the coil pack. Also checked the spark plug leads, they were all on correctly.

PSIG · Post by **PSIG** » Thu Jul 20, 2006 3:57 pm

It seems the most common error in EDIS wiring is that the schematic views are looking into the connectors on the wiring loom, not the module or coils. Maybe that helps?

danG · Post by **danG** » Thu Jul 20, 2006 4:27 pm

Probably not the problem, I think I wouldn't have had it running the first time if I couldn't figure that out

superchargingmachine · Thu Jul 20, 2006 5:13 pm

If it is sparking it seems like it can only be a couple things. The VR sensor is way off, which it doesn't sound like it could be. Or in the original install you had either the plug wires or the wires to the coils reversed. It is so easy to do. As a matter of fact my plug wires are reversed to compensate for reversed coil wires in my original install.

I can't think of any other way you could get RPM to Megatune and any spark out of the EDIS. If you had no spark or no RPM during cranking in Megatune you could start looking for other things.

danG · Post by **danG** » Thu Jul 20, 2006 6:26 pm

Ill go try switching the wires, but I'm pretty sure that part is correct. Does the +12v on the module need to be a pretty beefy wire? Thats the only one (power and ground wise) that I havent gone overboard on.

danG · Post by **danG** » Thu Jul 20, 2006 6:30 pm

Whoa. That fixed it. Thanks guys.

superchargingmachine · Thu Jul 20, 2006 6:34 pm

GREAT!!! I have been struggling with my car all week and I know how good it feels to get it fixed! I just got mine fixed tonight too.

BTW - I don't think the Module draws alot of amperage.

danG · Post by **danG** » Thu Jul 20, 2006 6:42 pm

I swear not only did I check those my friend did as well. Sooo wierd. Thanks again