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skyphix · 06-18-2020, 10:02 AM

A little bit more info is needed;

What PCM are you using and has it been tuned/modified at all?

Edited because I realized the DBC stuff doesn't have an easily adjustable idle speed screw and its controlled by the IAC. There is a TORX screw below the TB but you also have to do a TPS reset. If you didn't change that during the swap, its probably more related to build up than adjustment. Clearly I have more experience with DBW.

Another stupid question is, did you verify that all of the spark plug wires are firmly snapped into the coil packs? Two clicks total for factory wires.

Do you have a check engine light or OBD2 reader that you could scan for any codes?

I am finding a ton of info on dirty DBC Throttle bodies causing the throttle blades to stick. Idle speed between 500-600 is very normal, but below that isn't. Have you tried using brake cleaner to clean out any gunk in and around the throttle blade, including pushing it open with your finger and cleaning any residue around the blade and hinge areas?

06-18-2020, 10:02 AM	#2
skyphix Registered User Join Date: Sep 2018 Location: Hampden, ME Posts: 406	Re: 5.3 C10 Swap Idle Issue A little bit more info is needed; What PCM are you using and has it been tuned/modified at all? Edited because I realized the DBC stuff doesn't have an easily adjustable idle speed screw and its controlled by the IAC. There is a TORX screw below the TB but you also have to do a TPS reset. If you didn't change that during the swap, its probably more related to build up than adjustment. Clearly I have more experience with DBW. Another stupid question is, did you verify that all of the spark plug wires are firmly snapped into the coil packs? Two clicks total for factory wires. Do you have a check engine light or OBD2 reader that you could scan for any codes? I am finding a ton of info on dirty DBC Throttle bodies causing the throttle blades to stick. Idle speed between 500-600 is very normal, but below that isn't. Have you tried using brake cleaner to clean out any gunk in and around the throttle blade, including pushing it open with your finger and cleaning any residue around the blade and hinge areas? __________________ Eric 1980 C10 SWB 2003 Chevy Suburban 2500 LT Last edited by skyphix; 06-18-2020 at 03:15 PM.