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.
Is there an engine misfire code on a GM 4.8L?
Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. 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.
Why is my 5.3 L missing and rough idle intermittently?
5.3 L Missing and Rough Idle Intermittently I have changed Spark Plugs,Wires ,Coil Packs, and removed Fuel Injectors and soaked overnight. Engine code is a P0304. Misfire Cylinder #4. Most of the time around town is alright. When i put it on highway, it will surge like its cutting off and then pick right back up and be fine. Fuel Presure is 55 psi.
What’s the idle speed on a Chevy Silverado?
Had the BB Tune bump the idle up to 600 at 1000 miles and that seemed to eliminate it for the time being. I’m at 4.5K now and the idle was starting to get rough again.
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.
Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. 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.
Had the BB Tune bump the idle up to 600 at 1000 miles and that seemed to eliminate it for the time being. I’m at 4.5K now and the idle was starting to get rough again.
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.
What makes a GMC Sierra run too lean?
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. The heat of the exhaust can also bake the wiring going to/from them over time. If an oxygen sensor goes bad, it can make your Sierra run too lean (or rich).
Why are my spark plugs not working on my GMC Sierra?
Spark Plugs – One of the absolute most common causes (if not the most common reason that your Sierra 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.
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. The heat of the exhaust can also bake the wiring going to/from them over time. If an oxygen sensor goes bad, it can make your Sierra run too lean (or rich).
Spark Plugs – One of the absolute most common causes (if not the most common reason that your Sierra 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.
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.
What causes a GMC Sierra 1500 to lean?
The only other thing that will cause a lean condition is low fuel pressure. A vacuum leak will be problematic at idle and go away with higher rpms. Low fuel pressure will get much worse at higher rpms. 123 people found this helpful.
What does the fuel smell like in a GMC Sierra 1500?
If so pull the air filter off and sniff the throttle body for a fuel smell. If the diaphragm has ruptured it will literally be like putting a hose with fuel into the intake and running it full.
The only other thing that will cause a lean condition is low fuel pressure. A vacuum leak will be problematic at idle and go away with higher rpms. Low fuel pressure will get much worse at higher rpms. 123 people found this helpful.
If so pull the air filter off and sniff the throttle body for a fuel smell. If the diaphragm has ruptured it will literally be like putting a hose with fuel into the intake and running it full.
What to do if your GMC Sierra 1500 stops working?
Four Wheel Drive Components – Should the power center of your Sierra 1500 stop working, let us know. We’ve got the parts and expertise to replace a malfunctioning four wheel drive and get it back pulling again. Brakes – Don’t let squeaky brakes ruin a perfectly good workday.
When did the GMC Sierra have the most problems?
The model years with the most problems reported were 2004 and 2007, with more than 60 complaints each year, followed by 2002, 2003, 2005, and 2010, with more than 40 each year. Of the 112 problems, five different complaints have been reported 90 or more times.