2003 was mainly california emmisions so there is a few more hoses and junk to take off above the fuel filter i just did my other 4 injectors not to bad but like the guy above said above buy a 5 mm short allen socket i bought a blue point set for around 80 90 bucks helps alot i make sure to blow out the bolt heads REALLY good and make sure ur socket goes all the way in the bolt head before u break it loose its way easier then sripping it then dealing with trying to get it out stripped if u kmow what i mean

 

How often do the injectors need replacement? The spark plugs in the new gas engines last longer than these injectors from some of the write ups I see here.

 

Pretty much 01-04.5 had injector problems

 

I am at the point I am re-installing the lower valve covers. Do I need to use Lock Tight? How about Anti-Seize as they are steel bolts in aluminum heads?
Thanks,
Jack
I sure appreacate this post, I could not have done it w/o it...

 

This is my first diesel. I figure i have a bad injector...here's my issue,i have to prime it everytime and use a touch of starting fluid to bust if off everytime now...I know not to use a lot of fluid cause it'll damage the glowplugs and rings. Once it's running,idle is slightly rough, sounds like a gasburner with a sparkplug fowling out...kinna hickups every now and then. When it does this,it puts out a lil white/greyish smoke. it has striaght pipe so it rolls coal when i hammer on it...i'm just worried about the white smoke...I runs fine tho,no loss of power. It's tempermental tho, so sometimes it'll show some white smoke while ideling and other times it's purrin like a kitten and only black smoke when i hammer on it. Is this injector problem or does it seem more extensive like CP3? And how do i determine WHICH injector needs replacing? GM diagnostic appointment or what?

 

great write up man, helped out tramendiously.

 

if you dont have the tools to check the balance rates or return rates then it may be time to take it into the dealer and have then look at it.

when they tell you that you need to replace some/all of the injectors at a tune of so many thousand dollars, you now have a choice of paying them or saving a bunch doing it your self if you can. even if you have to buy some tools to do this it is still way cheaper doing it your self and you get to keep the tools after too

 

I am replacing my injectors again. Did them 14 months ago and found this write up and it was the best thing ever. I have replaced my injectors five times already and am getting frustrated. All I ever hear is that it is the fuel these days. Any Ideas? I added a fass fuel pump to gain the added filter and still have trouble. I cant get the pictures to show up like they did before to print off to reference as I am doing the repair.

 

wow, you must be getting pretty fast at replacing them. if they would last as long as they are supposed to you would probably have a million mile truck

 

300,000 miles. Its been a great truck other than having to change the injectors every year and a half.