I changed wires an plugs but still on driver side all plugs are black an I changed the fuel regulator too? When I drive the service engine lights on then when I get up to 60 or so it blinks off an on. An black smoke out the tail pipe
While more of a comment than a solution, have you checked the computer for codes? If there is a issue with the ECM (Electronic Control Module) the On Board Diagnostic system should tell you exactly what the problem is. It almost sounds like you have a clogged air filter and it is choking the engine down. However, if it is not a clogged filter, you could have a defective O2 Sensor. The Avalanche has 4 sensors. One before and after the converter on each side. These sensors tell the computer how to adjust the air/fuel ratio. Good Luck!
SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec
Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?
SOURCE: I have a 2004 Tahoe
Removal & Installation
of fuel Regulators on
4.8L, 5.3L & 6.0L Engine
To Remove:
CAUTION
Three styles of fuel pressure regulators and fuel rails will be used in this model year. Each regulator has a different "footprint" that consequently changes the size of the receiving port in the fuel rail. The regulator retaining clips are specific to each rail-regulator design and cannot be interchanged.
To Install:
8.1L Engine
To Remove:
Whenever the fuel pressure regulator is removed from the fuel rail NEW O-rings and a NEW retaining clip should be used on reinstallation.
Fuel pressure regulator vacuum line
To Install:
8.1L Fuel pressure regulator retainers
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These details will help.
Thanks.
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