Clean or change injectors on 5.3 v8

[lsv_palana]

Hello dear friends. Please teach me how to remove injectors on my v8 5.3l hummer h3 ? Is it hard procedure ? thank you.

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[JPaul]

It's pretty easy, remove the engine cover, disconnect the wiring connectors at each injector, then undo the bolts holding the fuel rails to the intake manifold, then pull the fuel rail off (injectors will come with it so you'll probably need to pull pretty hard to get them all out of the intake manifold), then undo the clips holding the injectors to the fuel rail and remove the injectors from the fuel rail. I took mine and had them cleaned and tested since it was a LOT cheaper than buying new injectors. The place I went to charged $20 an injector to clean, test, and replace the little filter that is in each injector.

The proper procedure is in the manual: https://schwarttzy.com/wp-content/uploads/2013/01/Hummer-H3-Engine-Mechanical-5.3L-1-4-1.pdf

 

[lsv_palana]

thank you for information. i have done as you said. Injectors come easy from engine block, but so hard from rail intake you need to use some force to do it. all 8 ijectors, after 10 years of use was clodged. Some not very hard, some absolutely. Cleaning process was take 7 hours. 3.5 hours for 4 injectors. After cleaning procedure whey all works fine. For one injector shop takes 8.33 dollars. After installing them all back i have checked for leaks.. all looks good. in my holy book named " Hummer H3" i have readed that all rubber o-rings must be replaced after removing injectors. i have kept old ones in place. no leaks.. maybe some one know where i can buy these rubber o-rings separately ? thank you.

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[JPaul]

Usually the shop doing the injector cleaning will replace the o-rings unless you tell them you have new ones already. You can get the online no problem, and the shop will probably be able to sell you some as well. It's just the GM 5.3 so nothing special about it.

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