mrch

I have a 93 rx7 that turns over, but has no spark. Unfortunately I do not have a manual or the covers to any of the fuse or relay boxes to start tracking down the problem. Could anyone snap a picture of them or provide any help would greatly be appreciated. Could replacing the instrument cluster from another car cause this problem-the cluster is not lighting up either. Thanks in advance for your help.

SBi_Owner

Check the 40a (B1) and the 40a (B2) fuses under the hood on the battery positive connection.

J.S.J

I would use a test light on all the fuses under the hood. I also would assuming you have been cranking a bit take a smell of the exhaust. If you have been cranking the engine a lot trying to start if there should be a gas Oder. If there is not and no spark maybe the crank sensors need a look. IF the crank sensor is skewed in some way you wont have spark or injector pulse but you will have a fuel pump.

SBi_Owner

Good points.

mrch

is there a way to test the crank sensors and where are they located-

lopedl

iTrader: (1)

The crank angle sensors are a bitsh to get too, you'll have to remove a lot of parts just to even get a look, let alone removing them. There right behind the bottom pully on the drivers side. Start simple, check all your fuses, and test all the spark plug wires insure that they are plugged in correctly, and that the wires are actually in working order. If your instrument clusters aren't working it would either be a fuse or ignitor related, bad ignitor connection. The ignitor is near the drivers firewall, next to where the master cylinder is at. Hope that helps.

mrch

Thanks for all suggestions-I will start the investigation this weekend and let you know.

RX794

I had this same problem once, and it turned out to be that the crank angle sensor plug wire had come out it's socket, I had to repair it with solder. Remember, the coils will not fire if they cannot see any rpm signal from the crank angle sensor.

mrch

I haven't checked the crank angle sensor yet, thanks for the suggestion. Over the weekend- checked all fuses and relays. Cleaned battery posts and connections to the positive side fuse box. Dash lights are on again. Turns over, but won't start. Not getting a spark, but one of the coils tested did indicate it was getting power.

mrch

After cranking over the engine, I pulled a plug and smelled no sign of fuel at all. Nor do I hear a fuel pump. Soooo-what controls both SPARK and Fuel! ! !

Upon testing the relay and fuses-I was not able to get a reading of continuity from the EGI Relay. Is there a way to test the EGI relay and what readings am I looking to obtain. Of course- I have a spare EGI relay that does not produce a reading as well! This may be the route of all evil for me-please help! ! !

mrch

Egi and fuel pump relay both click upon turning the key on. I will assume they are not the problem. Still no signs of fuel once the spark plug has been removed and/or spark.
After reading multiple posts-I decided to see what codes might be present after jumping the diagnosis box--my check engine light never even comes on once the key is turned and obviously does not emit a flashing code. WHAT would this be indicative of and does anyone have any other suggestions on how to start my RX7!

c00lduke

have you checked the EGI relay(yellow) and curcit opening relay(green) in the main fuse box? those will both effect spark and fuel.

lopedl

iTrader: (1)

You should probably give us a little more history about the car. Like, was it running fine previously to this problem. Or is this how you bought the car? THere are several components that controll spark, the ignition, wiring harness, ecu, ignitors, relays, fuses, coilpacks, crank angle sensors, spark plug wires, spark plugs, and in my case a kill switch. I may have left somthing out but I think that purty much covers it.

mrch

I have tested both the green and yellow relays on the positive ground strap-I hear them click upon turniung the key. The yellow EGI relay gave a continuity test of @ 11.
History--Drove the car for about a year, then had a front end collission. Sat for about a year. Started right up and drove through the parking lot of the body shop to the frame rack-only ran for about 1 minute due to the fact that everything was not connected and/or missing from the front of the engine. Put a new core support on, but the body shop felt that the car would be safer in the long run to put a front clip on starting from the shock towers forward. Upon doing this, they naturally removed everything from the front of the engine, including the wiring harness, fuse boxes, grounds etc. I feel that I'm on the right track to putting everything back in place. I have left off the radiator, condensor, fans, intercooler, and air box. So far , I've been researching where the wires that were disconnected go and what they are for-which is why I originally asked for pics of the fuse boxes. I have checked all fuses and relays-they're fine. NO spark and no fuel. I have also noticed that when I turn the key on, the check engine light does not come on at all-not even to cycle through the normal test. Still looking at her clueless! !

mad_7tist

ecu fuse