2006 chevy silverado 5.3 fuel injectors

[fishhuntwork]

I had my truck in the shop today for a cyl #1 and 3 misire, they said 1 is partially blocked and the other is totally blocked. Is this a common problem and is it something I can do myself? The quoted me $415 parts and labor, $350 for parts the rest is labor.

[Macgyver55]

Is it a steady or intermittent miss? What mileage does the truck have?

If it is common problem then it has slipped by me! I've worked on plenty of these and have yet to ever find a bad injector.

[Jeremy airjer W]

Agreed. I have yet to run into a bad injector on those engines.

[fishhuntwork]

It now has a steady miss, it started out with just at high speeds. Plugs and wires were replaced. It has about 115,000 miles.

[Jeremy airjer W]

The rail is not that hard to pull. A couple of bolts and you should be able to pop the injectors out of the intake plenum. Before you do this (with the engine cold) you should be able to see if test port on the drivers side of the fuel rail. Remove the cap and push in the valve. Gas will spray out at high pressure so be prepared. Try to hold a rag in that area to catch the fuel so it isn't all over the engine when you are done.

Once pressure is released remove the clips that hold the injectors into the fuel rail. You can either replace the injectors or swap them with 5 and seven to see if the misfire follows the injectors or stays with the cylinders.

If you choose to install new get yourself a tube of dielectric grease. Apply a small amount to both o-rings on the injectors. install the new injectors into the rail. Install the retainers. Install the injectors back into the plenum and secure the rail to the plenum.

[1968]

If you choose to install new get yourself a tube of dielectric grease. Apply a small amount to both o-rings on the injectors.

NO!!! Dielectric grease has silicone in it, and can contaminate oxygen sensors. On the latest direct injected engines this is even more important as fuel mixture is more tightly controlled than multiport. Clean engine oil for fuel system assembly lube. Petroleum jelly works too.

Maybe try a "professional" injection cleaning service first. If the one injector is truly 100% plugged this will probably not help though. It has to be able to pass detergent thru it to clean it. However, I have removed them and with carb clean,compressed air/rubber tip blowgun, injector buzzer, brought them back to life. Without an injector buzzer, 12 volts jumpered directly can be done for very short periods to push the crud out with the blowgun.

I've only seen one injector problem on a 5.3 and it wasn't plugged. It was a dribbler(not sealing). Injection service cleared that one up.

[fishhuntwork]

I replaced both injectors and it runs without missing.

[Jeremy airjer W]

Interesting!

[1968]

Great! However, I would still consider an injection service. The other 6 could be getting there. The fuel you are using could be suspect too. 5 years/115k is way too early for injector clogging. There's an 02 chev van I service that has over 400k on the original injectors.

Fuel filter been replaced? Hopefully not with a cheap one..

Just out of curiosity, is this a flex fuel truck and if so, do you run e85?