my friends swaped a motor s5, the motor for sure worked, came outta another friends rx7 that was an auto into a manuel fc. Anyways the motor works, since we got the motor in, it cranks over, but were getting no spark. On the leads, or trails. When we took off the spark plug wires there was water, and gooy crap in the coil pack terminals, so we cleaned them out but it still has no spark. When we did the swap we kept the harness on so nothing would get unplugged, but I don't know why we don't have any spark.

Sorry for writing so much my buddy just needs a car to drive.

 

the crank angle sensor plugs into the driver side harness and goes in through the fire wall. Make sure you have no plugs disconnected.

 

No. The harness for the coils is the FRONT harness and there are no plugs b/t the coils and the ECU.

You should get a meter out and with the key to ON, check for batt voltage at the small, white, two socket plug for the Lead coil assy. The black/yellow wire should have batt voltage. If it does not, then for some reason power isn't coming thru the Main relay to the coils FROM the EGI fuses in the engine bay fuse box.

If could be something as simple as the ENGINE fuse in the interior being shot. Or the EGI fuse being shot.

IF your getting power on the yellow/black wire mentioned above, then it's not a fuse problem.

A proven, easy way to tell if the coils are getting power, is to watch the tach needle as you try to start the engine. It will bump up/down a touch as you try to start the engine, IF the coils are getting power.

Then there is the question of "DID YOU ATTACH THE GROUND WIRES FOR THE ECU? That are located on the engine itself, or not?" Let me word that differently. The ECU gnds are on the EM harness that attaches to the engine itself. Are they bolted down? Only YOU know that.

The ECU won't work without the gnds. ECU produces spark and injector pulses. You can have batt voltage at the black/yellow wire mentioned above, but the coils won't spark unless the ignitors see a pulsed gnd from the ECU. ECU can't pulse a gnd unless the gnd for it's internals is .....grounded to the engine.

Some people have spark and don't know they have spark. A simple test is to take the CAS out of your other engine. Connect it to the harness in the car. Key to ON. Lead sparkplug wires next to the left strut towers studs. Spin the CAS bottom gear with your fingers. Spark should occur. When you do this, the key is ON, but the starter isn't being turned over pulling the batt voltage down, confusing you. It also saves wear on the starter and the internal engine parts.

 

I didn't say coils renob!

 

There are no connectors b/t the CAS and the ECU, other than the ones at each end.

 

The signal from the CAS goes through on the drivers side

 

And what does that inane statement mean.

 

also, the harness with the CAS plug on it doesn't go through the firewall. it goes from the battery to the trans.

 

Nevermind, wow. Go look at your stuff people

 

okay. please look at the blue wire harness (with the CAS connector on it), and tell me 1 thing that it connects to inside the cabin (through the firewal as you put it)

 

Hi, dummy. See the jpg I attached? Get some glasses.

 

oh yeah i get it..............