Have used at least 1 gallon of additive/injector cleaner has NOT made any difference. Took it to AutoZone checked the computer for codes NONE. Runs fine once you get away from Idle.
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2003 Chevrolet Tahoe
Question: 5.3 idle is 600 I think this is low and sometimes the idle pulsates.
Answer #1mastertech6371 September 10, 2011, 19:46Master
idle speed control motor could be malfunctioning. throttle body could be dirty as well. you need a shop with a real tech and a real diag. could be something simple.
EXPERTEC September 10, 2011, 20:58Journeyman
By now you have probally done damage to the fuel system with that much additive. You need to have the air induction system cleaned. Have a professional clean the throttle body, Mass airflow sensor and intake with an approved cleaner.
Replymboston, September 11, 2011, 19:54Rookie
What type of damage would have been caused?
ReplyEXPERTEC, September 11, 2011, 20:48Journeyman
Yes in your climate it is necessary to have coolant warm the throttle body because of the cold temperatures in the winter.
I live in southwest Florida. You really don't need throttle body warming here.
Please do not play chemist with additives. More is not better.
Answer #3delane 72 garage and body shop September 10, 2011, 22:02Master
clean throd body with carb cleaner with engine off open throdle wide open spray inside and wipe out with a rage dont use straw it might go into intake
Replymboston, September 11, 2011, 19:53Rookie
Today I removed the throttle bodyand throughly cleaned, it was very dirty also changed the air filter. I will see how it reacts over the next couple of days. And whats with the coolent connection on the bottom of the T-body? does the coolent cycle around the T-body?
Today - I don't know if my tach is wrong but my idle is now 500.