It's uncommon for one injector to fail in only 70,000 miles and, therefor, improbable that all six would fail. Are you having a starting or performance problem, or a check engine light issue?
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check the immobilizer as it may be preventing the ECM to allow fuel past the injectors
run the fault codes and it could be the ECM needs resetting using a scan tool
Many small things can cause this...dirty fuel, water in tank, fuel pressure regulator going bad, air filter clogged, throttle body dirty, clogged catalytic converter. First try fuel injector gas tank and line cleaner...least costly...use 2 bottles of STP concentrated injector cleaner...also add a bottle of liquid heet...to absorb any excess water or sludge in tank...worst cause could be low fuel pressure caused by bad fuel pump...Hope this helps.
Dealer will charge a fortune - always do. And then while there they will recommend all other sorts of things to wheedle more money out of you. So your best recourse is to use the injector cleaner in a full tank of gas. Maybe even a second,. If that does not take care of issue, the problem has to be somewhere else.
It will not help your Duramax injectors. They are not hydraulic. It will help your turbo and clean the rings in your engine. Hot Shot's Secret is a detergent and dispersant designed to clean the inside of the engine, especially the inside of oil fired injectors.
Could be time for a tune up.
1) new spark plugs with the gap set perfect. Every 70000 miles.
2) new spark plug wires.Every 100000 miles.
3) new fuel filter every 35000 miles.
4) new air filter every 35000 miles.
5) new oil and filter changed at least every 4000 miles.
6) make sure tire air pressure is correct.
And beleave it or not, a washed clean car gets 2-3 better mpg highway.
I hope this check list helps you and your car.
Take to aftermarket autoparts, ie Checker, Shucks, etc. They will plug into their computer and give you codes needed to fix. Usually for no cost. Good Luck
There is a little tester calles a NOID, it plugs into the harness connector to the fuel injector and flashes if there is a signal, they only cost a few dollars.
These particular Vortec engines need more fuel pressure to start than run. So being able start it by pouring fuel and being able to drive suggests a pump starting to go bad (loosing pressure), a cloogged filter (causing a restriction), or a fuel pressure regulator going out (letting off too much pressure).
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