Why is my Chevy Cobalt running rough at idle?

These packs are fired by the engines computer at exactly the right time to provide the optimal ignition timing. If a coil pack goes bad, it’ll cause a misfire and rough idle condition. Really, your Cobalt will be running rougher at any RPM, but a misfire will be most pronounced at idle.

Can a Chevy Cobalt stall at any time?

Stalls can happen at any time, and it can be incredibly jarring when it does happen. Before troubleshooting any automotive issue, including stalling issues with the Cobalt, make sure that you check the vehicles trouble codes with an OBD2 scanner.

Why are my spark plugs on my cobalt not working?

Spark Plugs – One of the absolute most common causes (if not the most common reason that your Cobalt 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.

What are the O2 sensors on a Chevy Cobalt?

The oxygen sensors that are equipped in your Chevy Cobalt are responsible for monitoring the exhaust to help the ECU determine the correct air/fuel mixture. Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest. They deal with super hot exhaust that can cover them in deposits that can leave them ineffective.

Why does my Chevy Cobalt stall at the stop sign?

This morning it actually stalled when I was pulling up to a stop sign to pull out of my subdivision. It did restart right away. When the Idle is rought the lights dim on the car, power steering becomes weak, and other problems you would expect when your idle drops and your car is about to stall.

Why does my Chevy Cobalt dashboard keep going?

Chevy is known for electrical problems. Mine started doing it a few months ago, and I scoured the internet for a definitive answer. It could be a few reasons. A bad battery, bad grounding, or, in my case, its a screwy ECM. My quick fix for it is to turn off my car, and smack the panel that covers the ECM a few times.

What’s the idle air control on a cobalt?

You have the Throttle control and the Idle air control and its all automated AND it electronically controls down-shifting int he transmission. great fantastic. except the electronics are completely unreliable…so its just a disaster. 15 people found this helpful. vizard answered 21 minutes ago FIXED…semi-fixed anyway.

How many miles does a Chevy Cobalt have?

It has 127k miles. I did a tune-up at 100k miles. (spark plugs, k&n filter, belt, and went to full synthetic oil) I noticed the car having a rough idle when slowing down. I recently bought a bottle of seafoam, and did an oil change and cleaned the k&n. After 1000miles my car has significantly inproved.

Are there any problems with the Chevy Cobalt?

The problem with GM TB in the newer balts is this…It does way too many functions as one device. in theory its great.

Is it normal for a Chevy Cobalt to run at 194F?

Some websites say this is normal, others say their Cobalts run at 194f.The 221Fmay be normal for many, but I don’t think it is right to have to constantly depend on the cooling fan to keep the engine temperature in check. My previous 2001 Sunfire 2.2 auto ran at 194f and the rad fan seldom came on, maybe once a year.

When does a Chevy Cobalt go to idle?

When decelerating on the freeway to come to a virtual stop for traffic, when stopping at a stop light, when pulling out of the driveway, or at any point when the RPM’s fall quickly to idle speed I have an irratic idle. This morning it actually stalled when I was pulling up to a stop sign to pull out of my subdivision.

When do Check Engine Lights Come On on a Chevy Cobalt?

It did restart right away. When the Idle is rought the lights dim on the car, power steering becomes weak, and other problems you would expect when your idle drops and your car is about to stall. No check engine lights come on at all (I wish they did, I have a nice scantool).

What causes a Chevy Cobalt to run strong?

There is a ton of carbon build-up in these intake’s. only requires removing 4 bolts from the body and the air intake off of the top, and a $2 can of cleaner. Idle runs strong now,with no hesitation. of course i have 50 electrical issues to figure out, buying a ford next time around. 44 people found this helpful.

Why is my Chevy 6.0 engine having problems?

Engines that had surpassed the milestone of 150,000 miles of the run, might come up with water pump issues and maybe a water pump failure. In case the running mileage is double to that, it’s always a wise move to replace the water pump with a new one.

What causes Chevy Equinox engine to idle rough?

If an oxygen sensor goes bad, it can make your Equinox run too lean (or rich). A super lean running engine will often idle rough.

What causes a Chevy Colorado to rough idle?

When one or more of these variables is off it can lead to a rough idling condition. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes.

What causes a Chevy Silverado to run rough?

If an oxygen sensor goes bad, it can make your Silverado run too lean (or rich). A super lean running engine will often idle rough. Fuel Injectors. The fuel injection systems job is to atomize the fuel into fine mist.

Are there any problems with the Chevy 6.0 engine?

4 Common Chevy 6.0 Engine Problems And How To Fix Them? In 2020, you won’t get newly released Chevy 6.0L engines, as Chevrolet moved on to the 6.2L Vortec Engine right after 2019. But as one of the most popular engines from the brand, we believe there are plenty of Chevy 6.0 engines equipped on automotive.

Why does my GM V8 engine misfire when cold?

Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174. But, as the engine warms up, the engine misfire or rough idle tends to go away; which seems confusing.

Why does my Chevy 6.0 engine Keep Knocking?

The reason for this problem can be a number of occurrences. But the most usual cause is the engine knocking system failure. Engine knocking takes place when the fuel (gasoline) starts to burn unevenly in the cylinder chamber. As a matter of fact, this fuel is supposed to burn in an order of pocket by pocket.

What kind of engine light does a cobalt have?

I have a 2006 Chevy Cobalt. The car idles very rough and the engine light is on. I have not gotten the computer scanned for codes yet. When i accelerate, my car runs great, just idle is bad and hesitates from a stop sign.

Why is my Check Engine light P0300 not working?

That would normally store a code P0300 in the computer. Since you seem to only be affected at idle, this could actually be an internal engine problem. See pictures below. The cylinder heads on the 4-cylinder engine have been known to have sticking valves due to carbon deposits.

What causes a P0300 engine to misfire at idle?

This problem can be caused by a faulty spark plug, malfunctioning ignition coil or ignition module, a plugged or restricted fuel injector or an internal mechanical problem. The problem we are seeing with this engine is the misfire on a warmed up motor, only at idle. If you press the gas pedal just a little, the fault goes away.

Why is the idle on my air conditioner so low?

If the idle is low and inconsistent, it may be due to an issue with your idle control valve. Low idles could also be caused by vacuum leaks. 3 Look for signs of a vacuum leak.

How can you tell if an idle air control valve is working?

Disconnect the IAC connector for a couple seconds while your engine is idling. If your engine idle didn’t change, you can suspect it to be the IAC. If it is working properly, unplugging it would cause your idle to freak out. Also check the wires going to the IAC connector.

How can I increase idle speed in a Chrysler?

If the resistance is outside that range, the idle control motor needs to be replaced. Use a bidirectional scan tool to increase idle speed in a Chrysler. Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. Use the command in the scan tool to increase the engine’s idle.

When to use open loop or closed loop fuel control?

Open loop STFT is used on some PCM’s when the O2 sensors are showing signs of operation (O2 Readiness), however the closed loop enable ECT has not been reached. In this mode the STFT’s may function. The final mode is Closed Loop and in this mode the full closed loop fuel controller is operational.