2000 Tahoe issues

[vanillaguerilla]

Hey everyone, I was wondering if anyone could give me some insight on a problem I have been having with my 2000 Tahoe...5.3 liter v8...basically the idle is considerably lower than it should be(between 350-400rpm) and it dies while in low idle or if I am at a stop light or in stop and go traffic and have the ac or heater on it will die, and on the advice of a local mechanic I have changed the throttle position sensor, sparkplugs, oil and serpintine belt and am still seeing these issues. I have had a diagnostic ran on the truck and it isnt producing any codes and I am not seeing the check engine light coming on....I dont know where to go from here and am at my wits end Any suggestions would be helpful...Thanks for reading!

 

[Val0412]

I know, it's kinda basic and simple, and you'd assume your mechanic looked at it; is the Throttle body really dirty? if it is that may be part of the problem. Check it, it may a quick and easy fix.

Here's a link and quote that explains it better.

http://www.mobiloil.com/USA-English/MotorOil/Car_Care/DIY/Cleaning_Engine_Throttle_Bodies.aspx

While throttle-body cleaning is good preventative maintenance, it should also help engine drivability. In fact, if you've noticed a rough idle, stumbling initial acceleration or even stalling - all when the engine is fully warmed up - a dirty throttle body could be the culprit. Once you look inside a throttle body, you will probably be surprised at the dirt, gum and varnish that have accumulated there over time.

 

[chrias]

Have you checked your fuel pressure? You could have leaky injectors, a bad fuel pressure regulator or your fuel pump may be on it's way out.

Also try running some Seafoam through it first to see if it clears it up.

 

[scott99zx6r]

Try cleaning the throttle body and also the IAC motor, its a small valve on the throttle body that controls your idle. They get gummed up and cause a low idle. Its mounted on the side of the throttle body w/ 2 small torx bolts. Not the tps, that mounts inline w/ the throttle shaft. Its the other one, take it out and clean the end and the hole it came out of w/ carb cleaner and a old toothbrush or rag. Bolt it all back up and try that.

 

[vanillaguerilla]

I should have updated this earlier, but I took the throttle body off and cleaned everything really well, cleaned the maf and then got as much carbon out of the intake as I could and she is running like a champ now :kar: thanks for checking this