I just bought a 1988 rx7 non-turbo 13b. It cranks over but there is absolutely NO spark. I'm pretty sure the coils are okey since it's highly unlikely that both coils/igniters went out at the same time, so what else would be a good check to find this no-spark problem?!!!! There is also no pulse with the voltage at coil wiring. Any help is much appriciated!!!!

 

check the EGI fuses under the hood, the 2 fuses closest to the engine.

 

the stip of 6 large fuses? i check all those. Good

 

if you also lost fuel check the engien fuse inside the car in the fuse box down by the clutch.

 

all fuses are good.

 

did you also lose fuel?

 

and im assuming the tach does not bounce when you try and crank it over right?

 

Its been a while since I've been around so ill start with a hello, but I just got my rebuilt motor back and am havin the exact same problem with my car, cranks but no good spark just a weak little spark every odd crank and a bounce of the tach here and there. hope there is an easy fix

 

Check your CAS connector, mine wasent getting any fire and i just wiggled it a little and it came back online....

 

the inst. cluster (speedo and odometer) is melted. previous owner didn't ground the starter. and no, the tach. doesn't bounce. no gauges work. you don't think the cluster is screwing with the spark do you? i wouldn't think so...

 

CAS connecotr?

 

Crank angle sensor, its a four connector plug in the front on the engine like below the p/s pump.

 

if the instrument cluster wiring is all melted together it is very possible the tach wire is grounding out on another wire and killing the ignition, yes.

more than likely though you are having grounding issues since you said he did not ground the starter. FCs have trouble with grounds already and that is the main ground from the battery to the motor..

 

thanks a lot guys. i'll be checking it out tomorrow. Peace!

 

did you ever find your problem?

 

Well Well, i found the ECU was fried from the starter not being grounded properly. So it took out the gauge cluster, speedo and the ECU(case grounds). I'm getting all 3 items tomorrow; UPS ... Let you guys know if it works

 

well i had a customer with the same problem a week ago, turns out his cas wires were damged somewhere in the harness. so what i have is a homemade harness with the big conector of the s4 ecu, i run the cas wires around the passanger side and it fired right up, by the way this is how s5 harness works , the rerouted the cas wires to the passanger side.(less interference from the starter while cranking)