Nothing works other than fuel pump and headlight bulbs. Help... please.

[Fuego]

OK back story, I went to jump the car about 6 months ago before taking a long trip away and it started going haywire (kept trying to start itself without the key in the ignition). I'm 99.99% sure I did not have polarities mixed up, but there's always a chance.. whatever. Anyway I was too fed up to deal with it anymore before leaving so it went untouched for ~5 months.

Fast forward to present dayish. Almost anything electronic is not working. No radio, windows, headlight motors, brake lights, you get the drift. New battery, new starter, and a reattempt. This time a ground sets itself on fire... great.

Two new grounds later and I'm at it again. Got the starter to turn for a bit, now it's stopped again. While it was turning, I found no spark was going to #1 ,no time to check the other 3 or injectors.

All fuses were checked and look fine. Pulled out the ECU and that looks fine too. Anybody have any insight whatsoever? Is it the harness? I'm really at a loss, and sorry for the long-winded post.

[Fuego]

Totally forgot to mention, it's an SR

[Livid_240sx]

You fried the ecu.

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[Fuego]

You fried the ecu.

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Nope...

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[yetijeff]

Nope...

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It is possible. It may not look physically burned but there are so many little electrical components u could fry and not know by lookin at em. U got a buddy you can swap with? Also which grounds are we talking about. Cuz there's a few. Also check and make sure your main power leads are not totally corroded. And not just at the ends. Take a razor and slit a few inches away from the end and if it's all green and crusty that could be giving you hell as well.

[Fuego]

It is possible. It may not look physically burned but there are so many little electrical components u could fry and not know by lookin at em. U got a buddy you can swap with? Also which grounds are we talking about. Cuz there's a few. Also check and make sure your main power leads are not totally corroded. And not just at the ends. Take a razor and slit a few inches away from the end and if it's all green and crusty that could be giving you hell as well.

That's why I said no, I put in a known working ecu earlier today with the same result. Grounds were in the engine bay, one starter, and I forget the other.

I'll check the power leads tomorrow. Thanks.

[mad-ass]

how them wires look on the driver side fender? since that's where the ignition wire goes.

[yetijeff]

That's why I said no, I put in a known working ecu earlier today with the same result. Grounds were in the engine bay, one starter, and I forget the other.

I'll check the power leads tomorrow. Thanks.

Get some thick gauge wire and make some test leads with gator clips. Ground the motor to the firewall. Firewall to sub frame sub frame to battery and battery to starter. So u need four. If it starts, unclip each one, one by one, and when it does or sputters you've found which grounding issue u have. Oh and +1 on the fender wires. I hit a big bump once before tucking and it killed the car and came back to life. If your super low, and u haven't tucked em they're most likely chewed to shit

[Livid_240sx]

Do you have a sound system?

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[Mikester]

^^Yea, maybe he could wire it to the fuel pump so he will at least have some tunes while out there scratching his head :D

But seriously, I'd be VERY hesitant about putting ANY other ECU in there till you get this figured out. Grounds don't usually cook unless something is loading down the system... Another thing- the main engine fuse should have fried long before any of the grounds... Something is either overloading the system or shorted out badly... You need to retrace everything from your main fuse box back... and for S & G, I'd try disconnecting the starter (heavy load), and taking a good hard look at your main power/ground wire- especially the little red fuseable link(?) on the positive battery terminal...

[Livid_240sx]

^^Yea, maybe he could wire it to the fuel pump so he will at least have some tunes while out there scratching his head :D

But seriously, I'd be VERY hesitant about putting ANY other ECU in there till you get this figured out. Grounds don't usually cook unless something is loading down the system... Another thing- the main engine fuse should have fried long before any of the grounds... Something is either overloading the system or shorted out badly... You need to retrace everything from your main fuse box back... and for S & G, I'd try disconnecting the starter (heavy load), and taking a good hard look at your main power/ground wire- especially the little red fuseable link(?) on the positive battery terminal...

I was thinking, my first civic si had a k engine swapped in when I bought it. The fucking thing had wires piggybacked everywhere and was half assed thrown in. I hooked up a sound system and it surged and fried my ecu. Then my blower motor. Then battery fuse. And so on. Lol

He said he has a sr, my thoughts were if it wasn't put in properly it could be surging the system.

[Mikester]

^^I was just bustin balls dude :)

A nice, Wiring Specialties upper/lower harness is worth its weight in gold when wanting to minimize electrical gremlins...

[Fuego]

Well one 75 amp "fuse" solved 99% of the problems. Now I'm stuck with no spark. I'll be putting in another ECU again hopefully tomorrow and see if that helps.