Why does my Silverado Sierra have high idle?

Cleaned the throttle body and went to put it back on and start it with out the intake attached to the throttle body. It idled funny so I shut it off.

Why does the idle go up after cleaning the throttle body?

The idle is going to be high at first until the computer relearns the idle again. Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel.

Why did my Sierra 5.3L throttle body change?

You said the throttle body was really dirty. The ECM made an adjustment due to the carbon build up on the throttle body. When you cleaned it, you caused a sudden change to the throttle body function and confused the ECM. It should readjust after about 200 miles or so and be back to normal. You need to take a road trip.

Can a Sierra 5.3L idle up to 2500 rpm?

If you take it out of gear, it will momentarily idle up to 2500 and then come back down to normal, THEY said oh yea thats common, probably the throttle body carboned up, we charge 125 bucks to clean that. I said my truck is still in warranty, what the hell?

Cleaned the throttle body and went to put it back on and start it with out the intake attached to the throttle body. It idled funny so I shut it off.

What happens when the IAC sensor goes bad?

Generally speaking, the engine will catch and run for a second or two, stutter and die. IAC-related start-and-stop conditions can be easily differentiated from fuel-related issues; during IAC-related stalling, applying throttle in light pulses may prolong engine failure, but will not prevent it.

Where is the Idle Air Control ( IAC ) valve?

Connected to the engine’s primary air intake valve (the Throttle Body, or TB), the Idle Air Control (IAC) valve is responsible for making minor adjustments to engine airflow. While the IAC valve’s effect is fairly minimal while the TB valve is open, many engines rely on the IAC for idle or low-speed operation. …

How can I check the idle air control?

To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness. While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly.

How much does a GMC Sierra oxygen sensor cost?

Advance Auto Parts has 96 different Oxygen Sensor for your vehicle, ready for shipping or in-store pick up. The best part is, our GMC Sierra 1500 Oxygen Sensor products start from as little as $39.99. When it comes to your GMC Sierra 1500, you want parts and products from only trusted brands.

Can you test the O2 sensor on a GM 4.3L?

Testing the oxygen sensor (commonly referred to as O2 sensors) on your 4.3L, 5.0L, or 5.7L GM vehicle is not that hard to do. Since oxygen sensors are not cheap and sometimes the PCM (Powertrain Control Module = Fuel Injection Computer) accuses them of being bad, when they aren’t, testing them is a good idea and this article will help you.

Are there any oxygen sensors on my GM mini van?

Your 4.3L, 5.0L, or 5.7L GM pick up, van , SUV, or mini-van comes equipped with several oxygen sensors, this article concentrates on testing the two that are before the catalytic converter ( O2S11 and O2S21 ). Important Suggestions And Tips. Symptoms Of A Bad Oxygen Sensor. Oxygen Sensor Basics. Where Are O2S11 And O2S21? Oxygen Sensor Test 1.

What are the symptoms of a bad oxygen sensor?

The effects of a bad oxygen sensor can be very subtle since they usually do not cause serious drive-ability problems. Here are the most common symptoms: The check engine light (CEL) will be illuminated on your instrument cluster. P0131 Upstream Heated Oxygen Sensor (HO2S11) Circuit Out Of Range Low Voltage (Bank 1).

Why does my GMC Sierra suddenly stop running?

Truck suddenly stops running, acting like it’s out of fuel. There is fuel in the gas tank and, I can hear the fuel pump when I turn the ignition on. Is there a fuse, or relay that is maybe causing this to happen?

What kind of truck is a 2001 GMC Sierra?

I have a 2001 GMC Sierra 1500 SLT 5.3l that I bought used with only 80k miles on it. This truck starts then immediately stalls. Here is a list of things that I have replaced to no avail.

What kind of help truck has HIGH idle?

SilveradoSierra.com • Help truck has high idle!!! : Vortec 5300 5.3L V8 Help truck has high idle!!! Cleaned the throttle body and went to put it back on and start it with out the intake attached to the throttle body.

Why does my GMC Sierra 1500 have a rough idle?

What are common reasons my GMC Sierra 1500 has a rough idle? While there are a variety of reasons your GMC Sierra 1500 has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.

I have a 2001 GMC Sierra 1500 SLT 5.3l that I bought used with only 80k miles on it. This truck starts then immediately stalls. Here is a list of things that I have replaced to no avail.

What’s the idle speed on a Chevy Silverado?

Although mine is a lot different than yours, I can tell you it will idle down to about 500 RPM when warm. However, if it’s been acting sluggish, you may need that checked out (or just spend more money on more HP ). Put in some better fuel (Shell or Mobil premium) and just DRIVE it. Very little extra cost to you and it cleans as you drive.

What should I do if my engine idles at 500 rpm?

Put in some better fuel (Shell or Mobil premium) and just DRIVE it. Very little extra cost to you and it cleans as you drive. Your truck will thank you! Generally speaking these injected computer controlled engines have pretty low ldle speeds.

What causes rough engine idle or TDC code?

So, should the engine misfire, rough engine idle or (TDC) code; point to an air leak in the intake manifold gasket, following the below directions. A very common cause of a leaking intake manifold is the gaskets and bolts used from the factory.

How often does the GMC Sierra come out?

Their four generations have appeared every five to seven years: 1999 to 2007, 2007 to 2014, 2014 to 2019, and 2019 to the present. Here’s a look at some of the most common problems the GMC Sierra has had over the years.

How many miles does GMC Sierra 2500HD have?

Mileage: 37,106 miles Body Type: Pickup Color: White Engine: 8 Cyl 6.0 L No accident or damage reported to CARFAX. Purchased on 06/21/14 and owned in WY until 03/06/21. Driven an estimated 10,764 miles/year.

What kind of engine does a GMC 3500 have?

Requires properly equipped 3500 Regular Cab DRW Long Box 2WD model with available 6.6L Duramax Turbo Diesel engine and gooseneck hitch. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

When did GMC Sierra 2500HD Denali come out?

Purchased on 07/18/18 and owned in GA until 05/07/21. Driven an estimated 33,931 miles/year.

How to troubleshoot a GM 4.8L 5.3L?

You can find this tutorial in Spanish here: Cómo Diagnosticar y Resolver Una Falla en Cilindro (GM 4.8L, 5.3L, 6.0L) (at: autotecnico-online.com ). The core symptom of a misfire is rough idle. This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see:

What kind of engine does GMC Yukon have?

The looks and comfort are great ( when i get to drive it). The 6.2 engine apparently is a total flop for this vehicle.

What is the drag coefficient of a GMC Yukon?

On the outside, the 2007 Yukon’s slab-sided exterior styling is clean, but in profile this GMC looks more Ford than GM. A major benefit of the new look is improved aerodynamics — with a 0.36 coefficient of drag (Cd), the Yukon slices through the wind as efficiently as some sports cars.

How many people can fit in a GMC Yukon?

The regular Yukon can be configured to seat anywhere from five to nine passengers, while the Yukon Denali tops out at eight. Maximum cargo capacity stands at 108.9 cubic feet — around 12 cubes more than an Armada and roughly the same as a Ford Expedition.

This 2007 GMC Yukon Denali 4dr 2007 GMC YUKON DENALI AWD SUV features a 6.2L 8 CYLINDER 8cyl Gasoline engine. It is equipped with a Automatic transmission. The vehicle is Gold Mist Metallic with a CocoaLight Cashmere Leather interior. It is offered As-Is, extended warranty is available.

What kind of suspension does GMC Yukon have?

Under the skin, the 2007 Yukon is still a traditional body-on-frame SUV with a solid rear axle. But the chassis’ evolution, though subtle, is significant. GMC claims that body stiffness has been increased significantly, and the old front torsion-bar suspension has been ditched in favor of a suppler coil-spring layout.

Where did the 2007 GMC Yukon come from?

1st owner purchased on 04/15/07 and owned in IA until 06/03/10 • 2nd owner purchased on 07/23/10 and owned in IA until 07/29/12 • 3rd owner purchased on 11/09/12 and owned in MN until .

When was the last time I serviced my GMC Yukon?

Last serviced at 148,132 miles in Oak Lawn, IL on 02/10/20 • Vehicle serviced • Maintenance inspection completed • Engine/powertrain computer/module reprogrammed. Mileage: 181,207 miles Body Type: SUV Color: Silver Engine: 8 Cyl 5.3 L No accident or damage reported to CARFAX. Purchased on 04/02/07 and owned in CA until .

Is there an intake manifold leak at high idle?

You may have an intake manifold leak on the bottom side of the engine at the lifter galley (I base this assumption by the fact that when you spray eather into the valve cover it changes the engine speed.) Re: high idle PLEASE HELP!!! You probably have a leak like aste25 mentioned.

Why does my LS Gen engine have high idle?

Once replacing that if the problem still persists you might have issues with the throttle body, I seen this before in the ls gen motor, they get “sticky” tb’s causing the high idle problem. Another thing is if you have an aftermarket tb, say from like bbk performance they need adjustments and tuning or else you’ll have similiar problems

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