What should the idle rate be on a 1997 GMC Truck?
Underdog, I don’t know the 1997 5.7, but 1000rpm sounds like a high idle, not where it should “bottom out”. A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine.
What’s the idle RPM on my Chevy Suburban?
My 1997 Chevy Suburban (5.7) is acting up on me. When I start it up the RPM and idle seem fine. As I let it sit for a couple of seconds the RPM’s slowly begin to drop until they finally bottom out at about 1K. As soon as I put it into Reverse/Drive etc. the RPM’s drop below that mark and it struggles to stay running.
What should the idle speed be on a GMC V8?
A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine. I think it was doing a crank relearn (I no longer remember why I came up with that theory, though).
Underdog, I don’t know the 1997 5.7, but 1000rpm sounds like a high idle, not where it should “bottom out”. A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine.
Why does my car engine run rough while idling?
When your car engine runs as it should, everything should be smooth without any noise. When any number of things goes wrong, the engine can start running rough, especially while idling. By understanding the causes of a car engine that has a rough idle, you can resolve the issue easily.
A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine. I think it was doing a crank relearn (I no longer remember why I came up with that theory, though).
My 1997 Chevy Suburban (5.7) is acting up on me. When I start it up the RPM and idle seem fine. As I let it sit for a couple of seconds the RPM’s slowly begin to drop until they finally bottom out at about 1K. As soon as I put it into Reverse/Drive etc. the RPM’s drop below that mark and it struggles to stay running.
Why is my GMC Sierra 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 Sierra will be running rougher at any RPM, but a misfire will be most pronounced at idle.
What does it mean when your car Idles smooth?
Smooth idling indicates that your engine’s fuel and air are mixing just right. What is rough idling? If your vehicle’s idle is rough, possibly rising and falling, or having difficulty maintaining a steady rate of rotation, you may have a problem that needs fixing.
Why does my Chevy truck stall at idle?
Filter is not that old, and if plugged or if pressure regulator is malfunctioning, why do I never see fuel pressure at throttle body so much as waver lower than 12psi? Also, many times the lean condition will start just off idle so bad so that truck wil fall flat on its face and stall.
Is there a code for cylinder 4.3 misfiring?
With the computer conected we monitored the live data and were recordeing most of the misfires in cylinder 6, 4, 2 with an occational misfire on 5. We had no codes recorded in the ECM but the fuel trims were way off.
What are the symptoms of a bad intake manifold gasket?
Symptoms of a Bad Intake Manifold Gasket – Chevy 4.3L 1 Engine misfires 2 Sluggish acceleration, lack of power 3 Lean or rich air to fuel ratios 4 Engine overheating 5 Low coolant light illuminating 6 Leaking coolant / dripping onto garage floor More …
Why does my truck miss when I put gas in it?
The truck will start and idle fine however as soon as you feed a little gas it starts to miss. Giving it even more gas is either covering up the misfire or it is clearing and seeems to run better. I’ve just replaced cap/rotor wires and plugs. The problem seems to get worse whenever it gets even slightly wet/humid.
What are the symptoms of a bad idle air control valve?
Below are the top 5 symptoms of a bad idle air control valve which you will easily notice. Since the idle air control valve is supposed to manage the idle speed of the engine, a bad valve will certainly throw that out of whack. It will cause the idle speed to randomly fluctuate to different speeds rather than stay at one constant speed.
Why is my Chevy 4.3 engine still running?
Checking your vehicle’s fluid levels is always a good idea to maintain the overall longevity of the engine. Once you have ruled out all the basics, you can go back to what the Chevy 4.3 engine is known for: bad idle air control valves and throttle control switches.
How can you tell if your car engine is idle?
You can often also feel the strange vibrations inside your car while sitting in the driver seat. However, modern cars do often have great engine mounts, and you do sometimes have to open the hood to check if the engine is vibrating or even jumping on idle.
What causes a Vortec 5.7 hesitation problem?
Problems with the Throttle position sensor, EGR Valve, Idle Air Control Valve, clogged catalitic converters, bad O2 sonsors causing truck to run with it much fuel, bad distributer cap/rotor, spark plugs and wires and a bad fuel filter are all problems that can cause the truck to bog down under heavy acceleration. Loading…
What’s the misfire code on a 1998 Vortec?
Can someone please help with what I should check next, I have a 1998 Chevy K1500 5.7 Vortec with a misfire, P0300 code for 3 months. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire.
What’s the idle RPM on a 99 Vortec?
Truck recently had an exhaust manifold replaced. When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. After the first few seconds, its idles rough. The engine struggles to keep it above 7-800 RPM.
Is it hard to start a Vortec rough idle?
On any start after the initial cold start in the morning, it is hard starting. You have to feather the gas a little and it shudders but it will start then you have to give it a little gas or it’ll stall. Driving, its fine as long as you are moving.
Can someone please help with what I should check next, I have a 1998 Chevy K1500 5.7 Vortec with a misfire, P0300 code for 3 months. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire.