SidWell Posted July 22, 2008 Share Posted July 22, 2008 I am not sure if this is the root problem or a symptom. I do not see a spark going to any of my plugs when I put a timing light on the spark plug wires. When I clamp the two common coil plugs together and crank the car, I see sparking on the plugs. I have verified the timing light works on another car. I installed 6 new Bosch Platinum plugs. Recently I rewired the engine bay. I removed the prototype wiring, cleaned up the harnesses and ran the relay box and MS ECU inside the passengers compartment. I have gone over my harness several times and unless I am missing something, it is all there. When I first rewired the MS, the car started, stumbled, ran very poorly and ultimately stopped running. I have since noticed my WB O2 sensor is pegged at the very rich setting. I have verified I have fuel pressure by disconnecting the fuel hose, letting the fuel squirt onto a rag, reconnecting the hose, cranking the engine and then disconnecting the hose and verifying the fuel squirts agan. I do not have a fuel pressure gauge at this time. MS II v3, EDIS ignition using a MoPar coil pack. Could the richness of the mixture keep the plugs from firing? Quote Link to comment Share on other sites More sharing options...
1 fast z Posted July 22, 2008 Share Posted July 22, 2008 If you take a screwdriver and put it in the spark plug wire, and hold it about .5" away from a grounded surface does it spark? Your wires might be too insulatated, to where your light wont pick up the inductive signal. Quote Link to comment Share on other sites More sharing options...
SidWell Posted July 22, 2008 Author Share Posted July 22, 2008 I just tested the #1 & #6 plug wires with the screwdriver. I saw a spark on both. I hooked up the timing light and it flashed on #1 but not on #6. Could it be that the cylinders are so full of fuel that the plugs won't fire? I tried to blow out the cylinders using compressed air but I am not sure if it did any good. Quote Link to comment Share on other sites More sharing options...
HoustonZ Posted July 22, 2008 Share Posted July 22, 2008 Off topic, but I fixed my EDIS spark last night. Spent forever trying to figure out why I was getting no spark, except when I turned my key from cranking back to run. Turns out my VR sensor was reversed. That was really strange because I wired everything back to their factory matching colors. Quote Link to comment Share on other sites More sharing options...
SidWell Posted July 22, 2008 Author Share Posted July 22, 2008 Thanks for the input. I will check the VR sensor as well. Does anybody know how the schematic lays out for the MoPar coil pack? The best I can figure is the coil is between a set of plugs such as from 1 to 6. When the signal from the EDIS controller transitions from 0 to +12v and back again it creates a voltage potiential in the secondary windings. This is what generates the voltage for both plugs. But if this is the case, how can one plug fire and not the other. You need both plugs to be firing to complete the circuit. Quote Link to comment Share on other sites More sharing options...
1 fast z Posted July 23, 2008 Share Posted July 23, 2008 No, its coming out of the coil, no matter what. I say go to a smaller diameter set of wires, and see if it will spark then. You will get no spark if the VR is reversed, BUT MS will still see a signal. Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted July 23, 2008 Share Posted July 23, 2008 We've seen a lot of timing lights have trouble with the second tower on two tower coils. This is a problem with the inductive pick-up and not the coil's fault. Sometimes it can be fixed by putting the pick-up on there upside down. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.