Why does my Chevy Silverado idle rough all the time?

The reason why the engine will idle rough is because it’s not getting as much fuel as it needs to idle and maintain the necessary engine revs. Locate the fuel filter along the frame of the truck (driver’s side). Remove filter from fuel lines. Inspect it and replace if necessary. Figure 3. Fuel filter.

What’s the idle RPM on a Silverado Sierra?

2009 Sierra 5.3l, idles up to 3000 rpm after throttle body clean – 1999-2013 Silverado & Sierra 1500 – GM-Trucks.com Took my truck to the dealership because it was having issues of when you come up to a stop sign or traffic light, wanting to keep going, it didnt like to go below 1500 or 2000 rpms.

Why does my GMC Sierra idle at 3000?

When you start it up it idles fine unless you touch the accelerator, it then jumps to 3000 and stays there until you turn it off and back on. Report the dealer to gm customer service. I have never had the “throttle body service” dealer used to try pushing all sorts of things you don’t need on me.

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.

Why is my Silverado 5.3L V8 intermittent?

One other intermittent problem I’ve had since the day the fuel pump went out is it acts the fuel pump is loosing it’s prime, meaning when I go to start the engine I have to spin it over for a few seconds before it will fire up and even then it will sputter a bit and catch up.

Why does my Silverado Sierra increase in rpm?

If your left foot is barely touching the brake, it can cause this. If your truck has afm the Rpms will increase 100-200 rpm when it goes I to 4 cyl mode. They will come back down when it goes back into 8 cyl mode So maybe it is switching back and forth from 4 to 8 cyl mode. That makes sense.

What kind of engine does a 1999 Silverado have?

Problem vehicle, 1999 Chevrolet Silverado 1500 5.3L V8 2WD with 351,000mi. I’ve read numerous threads on the rough idle cold start and the engine having some sort of intake leak and I don’t believe I have this problem, but I could be wrong.

What’s the voltage regulator on my Silverado truck?

The truck now has 85,000 miles and on my way to go camping (about 125 mile trip one way) the voltage regulator dropped to around 11 or 12. Of course I panicked and found the nearest parts store to check for a bad alternator, they said all good no problems.

What kind of idle does a Chevy silveraor have?

Misfire – Rough Idle: Hi, I Have 2009 Chevy Silveraor with About Hi, I have 2009 Chevy Silveraor with about 88,000 kms. Purchased the truck in December and have been having rough idle conditions and what feels to be misfiring (on morning start up, sitting at lights I can feel it, and during the daytime if it has sat for a couple hours).

What causes an Audi A4 to idle rough?

A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist. If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air.

Why are the spark plugs on my Chevy Silverado not working?

Spark Plugs – One of the absolute most common causes (if not the most common reason that your Silverado may be misfiring) is the spark plugs. Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval.

Why is my Chevy Silverado running rough at idle?

Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado happens to have them, they can go bad and cause a rough idle.

Why does the Check Engine light come on when the engine is idle?

The check engine light in your vehicle is designed to turn on if the Engine Control Unit (ECU) identifies an issues with how the engine is running. Look at your dashboard; if the check engine light is on in conjunction with idle issues, it may be because the idle control valve is malfunctioning.

How can I tell if my idle control valve is working?

To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.

What’s the idle speed on a GM Truck?

I recently got to the point of starting the new engine up, and it would idle at 2,000 RPM for 30 seconds or so and then drop to 1200 RPM. Both of these speeds are too high for idle.

Why does my Chevy TBI idle so high?

Here’s a list of troubleshooting items for a high idle: I’m surprised they didn’t include “vacuum leak” as a possible cause. That’s essentially what mine ended up being, except it wasn’t located at a vacuum tube or port. I found my solution here: [SOLVED] extream high idle problem on 1990 chevy 1500, 4.3 v6 TBI, with this post:

What was the problem with my 1995 Chevy Silverado?

My 1995 Chevrolet Silverado truck had a hesitation problem, which we were able to fix by replacing some parts. My Chevrolet truck would idle fine and passed the Emissions test, and there were no check engine lights, but there was hesitation when I stepped on the gas pedal. The engine would bog down or almost stalled out instead of going faster.

What causes a Chevy C / K 1500 to drop in idle?

In order to change these, you have to completely removed the distributor and completely disassemble the distributor to get the pickup off and replace it. These components are very sensitive and when failing, will cause misfire, idle issues, and cause it to burn rich as well. 11 out of 12 issues like this are because of this pickup coil.

What are the symptoms of a bad idle control valve?

$0.00 1 Irregular idle speed One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. 2 Check Engine Light comes on Another symptom of a potential issue with the idle control valve is an illuminated Check Engine Light. 3 Engine stalling

What causes the idle speed to go up or down?

The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. 2. Check Engine Light comes on

What’s the fuel pressure on a Silverado Sierra?

1. New Bosch Iridium spark plugs gapped to pre-gapped 2. Brand new ACDelco plug wires. The actual OEM ones, not the 3rd party set being rebadged 3. Fuel pressure is 57 PSI key on engine off. And 64PSI engine at idle while at temp.

How can I Make my Chevy Silverado idle smooth?

I decided to use seafoam spray ( https://seafoamsales.com/sea-foam-spray/) into the intake, let it sit for about 8 minutes. Drive the piss out of the truck and now my idle is smooth as silk and looks like the instant MPG is better by about 4-8MPG.

When does rough idle occur in a truck?

I have a rough idle situation that occurs only when the engine is at operating temp. Putting the truck in neutral does not help meaning it’s probably not something with the torque converter/transmission. 1. New Bosch Iridium spark plugs gapped to pre-gapped 2. Brand new ACDelco plug wires. The actual OEM ones, not the 3rd party set being rebadged

Where is the idle control valve on a Chevy Vortec?

The idle control valve sits on the throttle body and is responsible for adjusting the amount of air that enters the engine at idle, ultimately controlling engine idle speeds. At idle, the valve blocks a small amount of air from entering the engine, keeping idle RPM’s low.

What are the symptoms of a Chevy Vortec engine problem?

Symptoms of Failing Idle Control Valve and Throttle Position Sensor 1 Rough idling 2 Engine stalling 3 Hesitation during acceleration 4 Hard shifting and lack of power 5 Lack of accelerator responsiveness 6 P0122 engine code (TPS sensor)