2003 Tahoe flashing check engine light

[garren19714]

I have a 2003 Tahoe 4.6 with a check engine light flashing.
Replaced the plugs and wires
Tested the fuel pump
Checked the coil packs (which are testing good)
Ran the coil pack harness… no shorts.
I should also say it or firing on the passenger side of the motor but not the drivers side.
There is no in line filter on this truck…
HELP!!!!

 

[Fless]

You can use a noid light to see if the engine computer is sending control signals to the injectors. Also check the main injector plug for the driver's side to make sure pins are seated properly.

 

[Scottydoggs]

likely a clogged cat. if you scan it after the light flashes truck running still you'll likely find a p0300 code multiple misfire's.

 

[OR VietVet]

First: Welcome to the forum.

Second: What is the code in the system? That info would help a bunch.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

 

[garren19714]

First: Welcome to the forum.

Second: What is the code in the system? That info would help a bunch.

No codes at ALL!!

 

[Tonyrodz]

There should be a fuel filter mounted on the frame--if that's what you were talking about.

 

[garren19714]

There should be a fuel filter mounted on the frame--if that's what you were talking about.

There is not an in line filter on mine. It’s made into the fuel pump

 

[Tonyrodz]

There is not an in line filter on mine. It’s made into the fuel pump

Strange. On my 03 it's on the frame. Maybe yours is a later 03?

 

[Fless]

Strange. On my 03 it's on the frame. Maybe yours is a later 03?

Probably his is non-Flex. FF trucks this year have a fuel filter.

@garren19714 are you sure it's a 4.6L?

Hard to believe that a flashing CEL would not have a current or history code.