Ignition probs.. help!!

[A-Z Auto]

I have a 92 x cab I swapped a full drivetrain & wiring from a 99 Tahoe with the 5.7 vortec. The problem I’m having... it sounds like the timing Is 180* out sometimes... then other times it fires right up & will run great for days. I’m at a loss. Any ideas would be greatly appreciated

 

[redfishsc]

What kind of fuel pump are you using and what is your fuel pressure, key on but not running?

 

[east302]

Is it on cold or warm starts?


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[Schurkey]

I have a 92 x cab I swapped a full drivetrain & wiring from a 99 Tahoe with the 5.7 vortec. The problem I’m having... it sounds like the timing Is 180* out sometimes... then other times it fires right up & will run great for days. I’m at a loss. Any ideas would be greatly appreciated

1. Vortec 5.7 has known issues with the "spider" injection system.
2. Put a scan tool on the thing and see what the data stream has to say.
3. What is the fuel pressure?
4. How old/what condition are the ignition components in?

 

[A-Z Auto]

New ..
Distributor
Plugs
Wires
Spider
Fuel pump
Crank sensor

Only code I’m getting is bank 1 #2 heated circuit
Truck runs strong when it’ll start... then you might turn it off & it’ll sound like the timing is out 180*. This is my first experience with the vortec & it’s got me confused. Does it at cold start & warm.

 

[A-Z Auto]

Is it on cold or warm starts?


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Sometimes cold & sometimes warm. Makes no sense

 

[A-Z Auto]

What kind of fuel pump are you using and what is your fuel pressure, key on but not running?

I’d have to hook a gauge back up to it.. but I haven’t seen any fuel problems. Like I said... it runs really strong when it’ll start, but sometimes it sounds like the distributor has been turned 180* out of time.

 

[A-Z Auto]

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Looks like the distributor cap was the problem