I have a 2005 G35 coupe automatic with 60K miles on it.

Fo the past several months my G has been sitting because of an issue with the immobilizer/NATS/CAN systems. The car cranks but doesn't start. I finally used Uprev to disable my NATS this past weekend but I couldn't start it.

So like I said, I've cranked it a couple of dozen times over the past few months while trying to troubleshoot the NATS problem and it cranked really easy.

The last couple of times I cranked it I did notice that it started making a dry metal rub sound but I assumed that was the rusty parts like the a/c compressor (wisconsin saltly winters).

But yesterday I went to go start the car but it wouldn't turn over, so of course I think the battery is too low, so I charge it. Unfortunately the same reaction after charge.

Next I put my wifes car battery in there with the same result and the same result with my car battery.

So now I'm thinking the starter is fried, so I take it off and run it up to Autozone but it test good.

Then I decide to put a breaker bar on the main pulley and pushed in the closkwise direction (to the right/towards the drivers side) and it wouldn't budge.

Is it possible for the engine to seize from just cranking it?

 

That does sound like the engine has seized. I doubt it's caused by not the no-start problem. All I could think of was a valve might have dropped.

 

My assumption was that maybe one of the connecting rod bearings seized to the crankshaft.

I just never thought that either of those scenarios would/could happen at such low revolutions fom just cranking the engine and the engine temp not even really increasing because it wasn't running.

 

Oil up the cylinders through the spark plugs and try to manually crank with them removed. Best of luck

 

I will give that a try tonight. I'll let you know how it goes.

- I will remove all of th spark plugs.
- Put about a cap full of oil in each cylinder.
- let is sit for about an hour.
- then put the breaker bar on and see if it turns (with the spark plugs still out).

 

flooded with enough fuel to hydro lock? pull plugs and try cranking again.

 

That would be my first thing to try

 

Ahhhhh, I get what you're saying. Due to the constant cranking with no spark, fuel was just being dumped in there, so eventually it behaved the same as a hydro lock.


I'll pull those plugs tonight and give it a try.

 

dont use regular oil just use some of marvell mystery oil....it works but will smoke like hell till its burnt out.

 

Ok so I removed 5 of the 6 spark plugs. The middle plug on the passenger side will not budge. I tried it with a breaker bar and then resorted to the impact wrench to no avail.



So now I have it soaking overnight in a pool of Liquid Wrench penetrating oil.



Hopefully in the morning it will come out.



I'm assuming this cylinder is the cause of the reason the engine will not turn over.



I took the spark plug out about 2 months ago with no issues and the car hasn't ran so I don't know what would of caused for it to seize up in such a short time.

 

+1 on MMO. **** is magic.

But yea, be careful with that seized plug...if you break it your in a world of hurt with those deep tubes. Next time u install plugs use a sh!tload of anti seize.

 

So it soaked overnight in penetrating oil overnight and most of the next day. when I made it home I first tried it with a hand ratchet, no luck. so then I tried it with the impact wrench (electric), no luck again. The impact began getting really hot after a couple of minutes of constant impact, so I stopped.

So now I have it soaking in PB Blast. I'll leave it overnight again.

Given that this may be the hydrostatic lock, I will remove the fuel injector this weekend to relieve the pressure if the spark plug doesn't come out tomorrow.

 

impact on a spark plug? yikes... if it does come out, its probably going to bring the threads on the head with it

 

What ended up happening