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ECM keeps shorting out. Car cranks doesnt catch

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Hello. I am at my end and would hope joining would help.

To summarize. I bought a used 2010 sentra 2.0l back in august. I expected a couple issues but nothing like whats happening.

It started with the car cranking at start but not catching. Then starting at 2nd try. I was told I wanst lowering rpms enough before shut off. I started being very cautious about the revs before shutting off.

But still periodically without any particular pattern it would do the crank no catch then start on 2nd try. this happened about 10-15 times in the 9 months leading to this.

One day it started fine but then the whole car shut off, a loud pop or bang and buzzing. I shut off immediatly. turned the key and nothing, no power or anything. 3rd try it started right up and ran fine. I took it to dealer and they did a full diagonstic on electrical system and came up with nothing unusual. I was told it would have to die before they could find out what was wrong. 2 days after test is when the nightmare began.

The car would crank but not catch. all power working, no warning lights except the test. Took to dealer, they said the ECM was shorted and replaced. The car ran fine for a week. In the morning car did the crank no catch, then fired up after 2nd try thing and ran fine, then after parking for a few hours the car would not start again just crank.

towed to dealers and they said there is a short in the system causing the ECM to short out.
Heres the problem, its been 1 Week and they still cant find the problem. as a matter of fact they replaced the ECM again and the car runs fine.. no codes nothing. But They (and me) do not want the car released because the ECM is just going to short out again.

This is my first nissan and at 86k its turning out to be nothing but a money pit and an unrealiable fixture at the dealership. I would hope once this gets fixed it should be fine for years (if I ever get it back).

Has anyone ever seen this before so maybe I can help the dealership to find the problem. Im beggining to think let the dealership keep it cause its going to cost me the same to get it fixed that it cost me to buy it.
Help please

sorry i forgot to mention that i did have the pos. battery terminal clamp done from the recall.

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