J-Rat

iTrader: (2)

So its not idling very good then? Hmm...I had another theory, but you shot that out of the water. Maybe you are getting cross-talk between the wires? Are they (the wires) running next to each other for extended lengths? Thats my last suggestion. Other then that, I am stumped. I am kindo hoping someone else here will jump in and give some ideas.

Rat

HAILERS

I don't think a rotay will idle on only one rotor. Trust me. lBoth leads are firing.

Is it at all possible that you had the trail plug wires crossed??????? That would explain why it was running a bit rougher(I realize the idles not smooth now) before you took the trail plugs off.

Like someone said earlier, the rx-7 acts funny with some timing lights. I can put the inductive clamp around a lead wire and it will only flash once in a blue moon. I found that the closer I hold it to the lead coil assy the more consistent the flash is. I even twist the inductor at a angle sometimes to get a consistent flash so I can do the timing. I don't have a high priced timing light. Got it from Pepboys for some cheap price of 20-30 bucks perhaps. More than one person has written on this site mentioning the lack of flash on the timing lite when on the lead coil assy. The trail wires are more consistent.

From my experience, I can't tell the difference b/t having the trail plugs on and working vs having them disabled. But crossing the trail wires WILL give you a very bad idle. Cross the lead plugs with each other and there is no difference in performance. Both leads fire at the same time. Its called a wasted spark or something like that. Since they fire at the same time, who cares which lower plug they go on.

This is not a insult so don't take it like that: but the front coil assy is the lead coil assy and both wires go to the bottom plugs. The coil assy near the brake reservior is the trail coil assy and those wires MUST go to the top plugs and MUST to go to their respective plugs. Sorry, always a chance you got in a rut in thinking about what goes where. If it isn't relevant just forget I wrote it and let it go at that.

Since it runs better but still rough..........cheeez, I don't know. Could be the plugs are going. Just buy the lead plugs and forget about the trails. Try two new lead plugs. Then if that does not work try some different wires. Heck. We're into parts swapping. I hate that. Get expensive. Could just be a bad idle mixture.

Aw shucks, you have a 89. I was thinking if it was a 86-88 you could play with the variable resistor. You have none. Air leaks coome to mind. Starter fluid sprayed at the intake hose and joints while idling. If you get a rise in rpm you need to correct the leak a that point. I'd try to spray a tthe injector bases to see if the rubber gormmets are leaking.

Have you removed the vac hoses at the front of the dynamic chamber lately for any reason??? Get the lower two crossed will cause a bum idle. Only one of the bottom two is really a vacuum.

I seem to have gotten away from the coil assy. Just rambling. CAn't help but be suspicious that the trail plug wires were on where they shouldn't have been. That is the only explanation I have for it running smoother with those wires off. Later if I think of anything.

peacekeeper

Well all the wires are on their respective plugs, the plugs and wires were replaced about a week ago and the car has only moved about a mile since. It I checked the timing according to the trailing mark and T1 wire and I can fix the idle and then run it down the road, come back and the timing is off sometimes. I do have an exhaust leak from the exhaust manifold to the precat but it is only like a 1/2 gap. Will this cause a major power drain? The car has NO power under 5000rpm. I'll check everything else you suggested in the morning Hailers. I'm tired and need some sleep.
Charles

Henrik

If one coil fires then the other is also firing. They are both in the same circuit - the energy goes out one wire, jumps the gap on one plug, travels through the block to the other plug, jumps across that gap and back to the coil. If you were following closely, you'll note that the pulse is +ve on one wire and -ve on the other - this can fool many inductive timing lights. Most will have a 'this end to plug' label on them, try pointing it the other direction. If you want to see what the signals one the two wires actually look like - look here.

https://www.rx7club.com/forum/showth...light=ignition

Henrik
87TII