Why does my 99 1500 run rough when cold?

Need a little help. I have a 99 1500 with 5.3L. When first started in cooler weather the engine misfires, runs rough. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. After running for a while and the engine warms up it runs great.

Is the Vortec 5300 rough idle when cold?

I have a 99 1500 with 5.3L. When first started in cooler weather the engine misfires, runs rough. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. After running for a while and the engine warms up it runs great. I was thinking that the O2 sensor might be bad but not sure.

Why does my Chevy Silverado not accelerate at high RPMs?

If your Silverado won’t accelerate, but the RPM’s go up it’s usually not going to be an engine related issue. Somehow, the power that your engine is creating is not making it to the rear wheels. This is typically a transmission related issue. Here are the most common cause of acceleration with the RPM’s going up: 1. Transmission Fluid Low

Why does my car stall in cooler weather?

When first started in cooler weather the engine misfires, runs rough. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. After running for a while and the engine warms up it runs great. I was thinking that the O2 sensor might be bad but not sure.

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.

What kind of car runs rough when engine is warm?

Runs Rough When Engine Is Warm: I Have a 99 Silverado, 5.3 Liter I have a 99 silverado, 5.3 liter 4×4 137k miles. Runs great when engine is cold. After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. I ran the codes, had low voltage x4 oxygen sensors, and random misfires.

What happens when the engine warms up in a Silverado?

After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. I ran the codes, had low voltage x4 oxygen sensors, and random misfires. I replaced the 02 sensors because I am well over 100k miles.

What kind of engine does a 99 Silverado have?

I have a 99 silverado, 5.3 liter 4×4 137k miles. Runs great when engine is cold. After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. I ran the codes, had low voltage x4 oxygen sensors, and random misfires. I replaced the 02 sensors because I am well over 100k miles.

Why do I get a rough idle when it’s warm?

It is because rough idle when warm can either be caused by one faulty component or through series of problems. Hence, after knowing the ways to troubleshoot rough idle when warm problem, anyone can now keep a check on their vehicle’s status.

What makes a 1988 Chevy 5.7 TBI run rough?

1988 Chevy 5.7 tbi runs rough cold and…. Ok here is the deal. This truck has a good motor but it lacks power all the time not like barely moves but it won’t burn rubber. Now when its cold it runs really rough coughing and sputtering.

Why does my car run rough when it’s warm?

It is because rough idle when warm can either be caused by one faulty component or through series of problems. However, it is easy to recognize the problem, as during rough idling either the engine would run at an irregular rate or it may have varying RPMs without your foot on the gas pedal.

What causes a GMC truck to have a rough idle?

Please discard PIP3232A. The following diagnosis might be helpful if the vehicle exhibits the symptom (s) described in this PI. • A cold rough idle that diminishes as the engine warms up. • Possible DTCS P0171, P0174, or P0300. • Random misfires at idle. The intake gasket seals may be leaking around the intake ports, causing a lean condition.

Can a Chevy truck run in cold weather?

After its warm it runs just fine. The colder the outside temp. is, the worse the truck runs. Around 20-40 degrees I have to let it fully warm up otherwise its horrible and even stalls out occasionally. If its below 20 degrees it will take awhile to even get it started.

Is there a problem with rough idle when warm up?

So, once there’re visible signs of rough idling, trouableshoot the problem without causing any further delay. As reported by Car From Japan experts, most Makes getting this engine rough idle after warm up are: Though the problem is not common but drivers of the Makes had their car serviced at garages for Rough Idle When Warm.

What causes engine to run rough after warm up?

Most likely, the causes of rough engine idle crops from the basic functional components like direct fuel injectors, PCV valve, EGR valve, Oxygen sensors, vacuum leaks, air filter, and spark plugs or wire. Now, let’s fix the issue when engine runs rough after warm up in sequence and later troubleshoot the actual cause of it. 1.

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.

Is it good to run in hot weather?

Whether you have more time on your hands, more daylight, or just the desire to get out and run, summer is a great season for training. However, with summer comes high heat and you want to take precaution when doing your runs. Here are some tips for staying cool while running in hot weather.

Is the warm engine undriveable when cold?

This time it started with an idle around 1500rpm, slowly dropped to 1k, then quickly cycled back up to 1500. It did this for a minute or two, then dropped down to the rough idle, which seems to run between 500-800, kind of hunting around. Is there a key sequence that is used to help it learn? The car is undriveable when warm.

Can a lack of spark timing cause an engine to run rough?

Lack of proper spark timing can cause a different problem: one or more of the cylinders may misfire. That is to say combustion may be disrupted. You will feel, and maybe hear, this as a brief stutter in the engine. You might feel that the engine runs rough or vibrates at idle, say, when you’re sitting at a red light.

Why does my GMC Truck idle rough in the morning?

So the past couple months I’ve noticed my truck has a really rough idle in the mornings when it is cold out, to the point where it has even died before. I just replaced the plugs about 3 months back and it ran fine after, people have told me things like it is the o2 sensors to the cat is plugged up to my fuel filter is bad.

Can a 6.0L diesel start in the Cold?

Mine also sits overnight in the cold and well… the next morning I end up having to crank mine at least 4 times for about 8 seconds before it starts and blows its white smoke. If the battery charge is ok you can rule that out but they do lose power in the cold. If it takes only 2 cranks like you said, thats normal.

Why is my Ford 6.0L hard start in cold temps?

0 had numerous problems with cold start, so Ford took a look at this, and realized the issue (partly) was due to the cold, thick, oil, not letting the injector open/close correctly, meaning bad starts/ poor running until up to temp.

What was the problem with the Ford 6.0?

The 6.0 had numerous problems with cold start, so Ford took a look at this, and realized the issue (partly) was due to the cold, thick, oil, not letting the injector open/close correctly, meaning bad starts/ poor running until up to temp.

Can a 2005 F-350 dually start in cold weather?

My 2005 F-350 Dually is a lot like me, I don’t want to get out of a warm bed on a cold day. It has been starting fine in Houston TX, but now I am in Northern TN and it takes awhile to “git er done”. It will crank, try to start and then no fire. Lots of black and white smoke coming out when it fires.

What happens when engine gets up to temp?

Truck runs great cold when it gets up to temp the power decreases greatly. new fuel pump, new fuel filter, new air filter has been hooked up to two different computers and it’s showing no codes at all. New muffler and dual pipes,the old ones were bad. im at a loss and so are my mechanics

What happens when your coolant temperature sensor is bad?

The engine is very sensitive to wrong air-fuel mixtures at idle and this is a condition when you might notice that something is wrong with your engine coolant temperature sensor. The engine coolant temperature sensor can have a hard impact on the air-fuel mixture. A bad air-fuel mixture can also cause the engine performance to drop drastically.

What should coolant temp be when engine is hot?

With a good OBD2 code reader, you can also check the live data and the parameters of the CTS sensor. Check that the temperature value of the CTS is around 80-90c when the engine is hot. A lot of engine coolant temperature sensors have two wires and the sensor is controlled by Ohm.

Why is my GM 4.8l engine running too lean?

The engine may be running too lean, due to a leaking intake manifold. Too lean means too much air and not enough fuel; according to the power control module (PCM) calculation. When the engine is cold, not all sensors function. As the engine warms up the oxygen sensors report the lean condition.

What causes a misfire after a warm up?

Misfire After Warm Up: Misfire After Warm Up. Runs Great When Cold… Misfire after warm up. Runs great when cold. Has new engine new plugs wires injectors when starts misfiring can shut down start back up and runs fine until a few minutes then starts again. have the same problem? This sounds like you have an intake valve that is leaking.

When does a Harley Davidson engine misfire at low speeds?

However, when cruising along about 25-30 mph (in either 2nd or 3rd gear) it is always misfiring and sputtering pretty bad now (had a little hint originally and definitely getting worse now). After coming to a stop, the idle is a bit rough and sometimes the engine acts like it wants to cut out for a few seconds after which it seems to idle OK.

Why does my 2000 Sunfire engine keep sputtering?

Same problems with 2000 sunfire replaced all the usual suspects plugs wires,tps,coils,idle sensor turned out to be ignition control module was gone once i replaced the module check engine light went off the car worked fine ever since. 3 people found this helpful.

Why does my 99 1500 run rough when cold?