Crank no start after rebuilding/replacing the engine?

JJ GARZA

MEMBER
2003 CHEVROLET AVALANCHE
5.3L
V8
2WD
AUTOMATIC
1 MILES

My friend and I are having a problem with a crank no start after rebuilding/replacing his engine. Tested fuel pressure and had 10psi so replaced the pump and was back to 50 with the key on still no start. I tested for spark at the plug wire, and it had spark. All grounds are in the correct spots and tested good with a circuit tester. I hooked a scan tool to it, and we got it to run for about 10 seconds and I checked for engine codes there was nothing, I then did a complete system check to find a p1626 in the PCM and a B2961 in the BCM. From there I assumed the p1626 was keeping the car from running so I told my friend to get all the vats deleted when he went to get his tune for his cam so he did, after that all the vats, o2, evap were deleted but it still does not run. I still haven’t tested the injectors, or the injector harness. Any help is appreciated.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,909 POSTS

The first thing I would do is see if it runs on starting fluid, this will test the ignition performance and to see if the engine is in good shape. I would upload a short video in your response of the engine cranking so I can see what is going on and tell you if the engine is any good or not. Please go over this guide and i can help you get it running for you.

P1626 - Theft Deterrent Fuel Enable Signal Not Received: This code is often related to the vehicle's anti-theft system.

B2961 - Key In Ignition Circuit Malfunction: This code indicates that there is a problem with the circuit that detects whether the key is in the ignition.

Please go over this guide, also can I ask if the security light is flashing when cranking over?

https://www.2carpros.com/articles/car-not-running-advanced

Please go over this guide and get back to us.

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Sunday, March 17th, 2024 AT 11:23 AM

KEN L

MASTER CERTIFIED MECHANIC
42,909 POSTS

Can I ask if the security light is flashing when cranking over?

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Sunday, March 17th, 2024 AT 11:26 AM

JJ GARZA

MEMBER
15 POSTS

I have tried starting fluid and it still wouldn’t start. It runs when it wants to and as soon as it does it will run for 30 seconds then turn off. The security light also does not flash.

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Sunday, March 17th, 2024 AT 11:38 AM

JJ GARZA

MEMBER
15 POSTS

Tested injector harness and injectors and they were good, and engine is getting spark moving to compression test next.

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Sunday, March 17th, 2024 AT 10:31 PM

KEN L

MASTER CERTIFIED MECHANIC
42,909 POSTS

Yep, let's test for injector flash, also is there a chance the exhaust system is plugged up? I would put your hand over the exhaust pipe when cranking to see if anything comes out. These guides can help us:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

and

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please go over this guide and get back to us.