Crank no start after accidentally touching both battery cables together while replacing the ECU?

CAGUIRRETX

MEMBER
2004 CHEVROLET AVALANCHE
5.3L
V8
2WD
AUTOMATIC
3,749,220 MILES

I replaced my ECU and had it programmed to my vin and the truck cranks but no start. It has a new fuel pump, new invitation ignition switch, new plugs, wires, and filter. I accidentally touched both battery cables together before I replaced ECU and since then no start.

Friday, April 26th, 2024 AT 5:10 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

If the battery was disconnected and you touched the cables together, that won't hurt anything.

We need to determine if the engine is getting ignition spark and fuel. Chances are one or the other is missing. Also, pay attention to the anti-theft light. Does it stay on or blink?

Let me know that. On the other hand, try to see if it will start using starting fluid. If it does and then stalls, we know it is a fuel related issue. If there is no change, I need you to check for ignition spark at the plugs.

Here is a link that explains how to do it:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Try this and let me know the results.

Take care,

Joe

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Friday, April 26th, 2024 AT 8:38 PM