1992 Mazda MX3 electrical diagnosis

CC1059

MEMBER
1992 MAZDA MX3

Electrical problem
1992 Mazda MX3 4 cyl Two Wheel Drive Automatic

If anyone could help I'd appreciate it as I need to get this going. I did ask the same question and made a donation first thing this morning but have not heard anything back.
I tuned up my daughters car yesterday re rough idle. I did plugs, rotor and cap. After completion it fired up and ran beautifully for about a minute then stopped and wouldn't start. I traced back to no spark from the coil and replaced it. Again no spark. This morning I went out and tried it and it started right up, ran until I hit the throttle and stopped and would not re start. Again no spark from the coil although the large feed wire had power. I also noticed this morning that there was no smell of fuel. I pulled off the fuel line from the inlet of the filter and turned the key on but no fuel.
I'm an old 70's guy so anything computer confuses me. My question is, is there a system that will shot down both power to the fuel pump (electric) and prevent spark. Any suggestions would be appreciated. I'm at a loss.

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Sir-I need you to check the red and white wire at the injectors harness connector for power turn ignitio switch On-tell me if you have it. This is important we are dealing with 2 relays the ECM and COR relays-also the blue wire at positive coil terminal. I need to know this before we can continue. I'll be waiting

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Sunday, December 7th, 2008 AT 2:19 AM

CC1059

MEMBER
12 POSTS

Hi, Went out at first light this morning and it did the same thing, Fired and ran for about ten seconds then quit. Same thing if I put it in "N". Both wires you mentioned have power.
Look foreward to hearing back from you.
Craig

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Sunday, December 7th, 2008 AT 10:54 AM

RASMATAZ

MECHANIC
75,992 POSTS

Craig

Test/replace the engine main relay and the circuit opening relay or swap with a like one and see what happens-

Also inspect and test the crank angle sensors-1 is in the distributor assemblyand the other is on the bottom of the crank pulley. See pic below item 12 and 14

The circuit opening relay powers the fuel pump -when the main relay powers it

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Sunday, December 7th, 2008 AT 3:34 PM

MONTYCHESTERFIELD

MEMBER
5 POSTS

I'm actually having a very very similar problem with my 92 Mazda 323. I replaced the rotor and distributer cap and I ended up putting rotor on wrong and tried starting it. Realizing I didn't mark which way the rotor was on before taking the old one off I got out and got it on the correct way. After this. It started RIGHT UP. Sounded fine for like a minute. Then I drove it, felt a very slight bog when I let off the gas. After I parked. Shut it off. Tried starting it again. Just kept trying to crank with no results. I've been trying to figure it out for two days now and sometimes it starts, most the time it doesnt. Sometimes it will start and be fine, other times it will start with it idling really odd barely holding on before it'll die. When I turn the key to ON I can't hear the fuel pump. But like I said SOMETIMES it starts right up and I even drove it twice for a good drive and it was fine. This is beyond me.

Sometimes the check engine light comes off. It'll stay on but usually go off. I've seen it even blink sometimes.

Any suggestions?

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Monday, September 7th, 2009 AT 5:00 PM