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.
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 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.
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 GMC Truck die at idle when warm?
So I wasn’t suspicious of fuel pressure, then later checked it and I have a steady 10psi from the moment I turn the key until a few seconds after it dies so the fuel pump is good. It runs strong and is fine until I idle. This happens only when the engine is warm and last time I checked it never went into closed loop.
When does your car hesitate at 45 mph?
I started getting a hesitation/bucking in my 2001 F150 SCREW 5.4L 96,000 miles. It does it most often when you are barely on the gas at 45 to 50 MPH and then you press the gas to accelerate. It hesitates for a second and then takes off.
What happens when there is a vacuum leak in a GMC Truck?
When theres a vacuum leak the engine is running lean and rough. By adding fuel you’ll richen the mixture and compensate for the vacuum leak. The engine will then run smooth. Ooh ok gotcha, ETS=engine temp sensor. It’s what controls the gauges, and is on the driver side head IIRC.
What happens when you turn off the gas in a GMC Truck?
If I tap the gas while the fluctuating is happening it goes away for about 10-20 seconds. So I wasn’t suspicious of fuel pressure, then later checked it and I have a steady 10psi from the moment I turn the key until a few seconds after it dies so the fuel pump is good.
Why does my car feel sluggish when I Turn on the engine?
A faulty turbo should log a boost fault code and will often log engine misfire codes. A blown or faulty turbo will in itself make your car very noticeable sluggish. Replacing a complete turbo charger will be a challenge, however a boost pipe or boost solenoid is a very simple fix.
What does it mean when your engine hesitates under load?
An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. If the Check Engine Light comes on, you may find any of the following codes: P0171, P0174 Lean fuel condition codes P0120 to P0124 Throttle position sensor codes
What does it mean when your car engine gets warm?
Hesitation/stalling when engine gets warm. chevrolet stal… Q: Hesitation/stalling when engine gets warm. Hesitation/stalling when engine gets warm, Usually first it hesitates but it tents to take about an hour of driving before it starts hesitating.
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.
Why is the slow starter cranking once engine warmed up?
– Page 1 – Chimaera – PistonHeads UK Slow starter cranking once engine warmed up. Why ?
Why does my car go sluggish at 40 mph?
A modern car is often sluggish because an engine fault has triggered the limp home mode. The limp mode is a fail safe, it limits speed to between 30-40 mph. Symptoms of limp mode include: In this post we’ll look at the likely causes of engine sluggishness in a little more detail.