Fuel Injectors

[SMWS6TA]

I've been trying to find what I believe is a vacuum leak and I think I may have found it. I think my injectors are not completely sealing and are letting in some air.

Is there a size difference between the 98' 28lb injectors and the 02' 28 lb injectors?

98's have the LS1 intake while the 02's have the LS6 intake. I ask because my fuel injectors have a bitch of a time sliding into the LS6 intake and have no issues with the LS1.

I've seen no fuel leaks or have had no miss fire issues or any lean codes pop up yet.

[sutie]

fittment should be the same if i remember....try replacing the o-rings on the injectors, should help them get seated better.

[SMWS6TA]

I get 2 different part numbers.

98' Part # 12533952
02" Part # 12482704

[sutie]

thats probably just because there differnt injectors, however, size should be the same for seating purposes.

[transamtom]

Have you tried the spray test to see if the idle picks up or surges?

Carb cleaner or brake cleaner work good.

[SMWS6TA]

Have you tried the spray test to see if the idle picks up or surges?

Carb cleaner or brake cleaner work good.

Will do tonight or tomorrow.


Carb cleaner good


Break Cleaner bad

[Mr. Luos]

O-rings may vary from 98 to 02. Both should work though. Use the newer part number (as with anything that is the same) from GM.

I use a VERY small amount of vaseline on the o-rings prior to seating them. The ones I have on the T/A were very tight going into the LS1Speed rails and the FAST90.

I don't see an o-ring being the problem here though. Do the carb cleaner test though just to be sure.

[transamtom]

Will do tonight or tomorrow.


Carb cleaner good


Break Cleaner bad

I have used both,the brake cleaner will help clean up any oil or grease in the engine bay

[Z28_Driver]

I have used both,the brake cleaner will help clean up any oil or grease in the engine bay

Brake cleaner will ruin the finish on painted parts and make some plastics brittle. Your safer to stick with the carb cleaner.

[SMWS6TA]

I have used both,the brake cleaner will help clean up any oil or grease in the engine bay

Brake cleaner will ruin the finish on painted parts and make some plastics brittle. Your safer to stick with the carb cleaner.

My Intake is painted that is the second reason why I won't used the brake cleaner. The 1st was what z28 stated.