Left key on overnight. What did I burn up?

[BitchinZ]

Edit - It was the fuel pump.  Replaced it and it starts.

 

I have a 77 280Z.  I was testing different LED bulbs last night and like an idiot left the key in the ON position overnight. 

 

I recharged the battery and the car cranks fine but wont fire.  What did I burn up?  What should I try replacing first, the ignition coil maybe, or something else?

Edited October 24, 2013 by BitchinZ

[78zstyle]

Nothing ought of burnt up.

[9rider]

I don't think anything that could busted. I accident left my key on all time and beside drained out battery , nothing broken. My ignition key is busted. I can take key out without turn it all the way to off position, that's why.

[BitchinZ]

Hmm.  It ran fine yesterday, after I did that it wont start today.

[78zstyle]

Check for fuel / spark and we can go from there.

[NewZed]

 What should I try replacing first, ....?

Start by not thinking like this....

[Domzs]

I have replaced coils , 1 ECM ( Honda ) , BCMs ( GMC ) , and others ( can't remember ) due to key in ON position overnight . For most cars , nothing other then a dead battery .

[winstonusmc]

Maybe ballast resistor. Check your spark.

[seattlejester]

Or try another battery if it's old, you would be surprised how fast a battery looses charge if it's been cycled all the way down too many times.

[morbias]

Do you have pertronix installed? Older models seem to burn out if you leave the ignition on

[BitchinZ]

Checked and it has no spark.  Battery is good, all fuses are good.  Tired a different coil and same thing.

 

I dont know if it has pertronix or not.   Ill look into that and the ballast resistor.

[winstonusmc]

Or even the points themselves. Burned points up in a Jeep when the key was left on.

[BitchinZ]

Does the 280Z have points?  Can they be cleaned, can you replace just the points themselves?

Edited September 28, 2013 by BitchinZ

[BluDestiny]

280's use electronic ignition. 

[Tony D]

Argh...

[madkaw]

Argh...

LOL

[ISPKI]

Nothing should have "burned up" if you left the key. It shouldnt be charging or running a whole lot on the car with the engine not being on. You should run tests on your ignition and fuel system before replacing anything.

[Phantom]

So this is a stock 280Z?  No electrical modifications, correct? The battery turns the engine over but you have no spark, correct?  I'm assuming that you checked to be sure that the fuel pump is providing fuel pressure and that the injectors are actually firing?

If all that is true and the only problem is no spark then work backward through the system.  Check each plug for spark. Pull the distributor apart and check the internals to ensure nothing is cracked or broken. Even a cracked cap could cause the system to not fire.  You're positive the coil is good? You could have two bad coils if you're trying used ones.  Don't remember but I think you should have a fusible link in the system there somewhere so check them to make sure it's not burned through.  Hopefully iyou won't end up back at the ECM or the ignition switch on the column.

[BitchinZ]

It has spark now but not getting fuel.  The rotor had threw off the metal ground piece, found it sitting there in the dist.  Replaced it and now has white spark.  Ballast resistor tested at 1.6 ohms.

 

Its not pumping fuel.  I understand that the fuel pump only comes on when starting, so I think leaving the key in the ON position wouldnt burn it up.  Tomorrow Im going to see it I can hear the pump with the starter wire disconnected or go under there and see if its getting power with the multimeter.

 

If the pump is working Ill look into the relay above the hood latch.  After that Im not sure what Ill check next.

Edited October 7, 2013 by BitchinZ