What makes a little knocking noise at start up?
Another possibility is piston slap but that would likely take a little longer to go away as the pistons heat and expand. A little piston slap at startup is harmless as is a little temporary loose valve lifter noise. edb1961 July 6, 2016, 2:18am #6 Four months and 1300 miles since last oil change.
What does it mean when you hear a knocking sound in your car?
The exact type of sound that you hear might determine the problem. Most people will hear a knocking sound when there is a mechanical problem somewhere in their engine. Some people call it a pinging sound which does not go away. It may even get worse as you step on the gas pedal.
Why does my Blazer make a knocking noise when I start it up?
2000 Blazer 4wd, automatic, 122000 miles In the last couple of weeks, if the Blazer isn’t driven for 3 or more days, there is a slight knocking noise for 15 to 20 seconds after start up. Oil level and pressure are fine. I’m guessing it’s the lifters, but I’m open to any suggestions.
What’s the best way to fix engine knocking noise?
The first step is to use better quality fuel. Look by your gas cap or in the owner’s manual of your car and see what the octane rating of your fuel is supposed to be. Then make sure you pump fuel into your car which has, at minimum, the same octane rating. For most, standard 87 octane fuel is fine.
What does knocking noise at start up mean?
Noise did not occur after sitting overnight. Noise duration is too short to track down. Noise is closer to a light tapping, definitely not a heavy thump. Similar to an exhaust manifold leak, but not as loud. Noise does not happen every time. More likely to occur after the truck has been sitting a few days. Ed B. cigroller July 6, 2016, 2:18am #7
Why does my car make a knocking noise when I Turn on the engine?
Basically, spark plugs have different levels of resistance to hotter temperatures from the engine. If you use the wrong spark plug which cannot tolerate your engine’s heat, then it will not work correctly. This will result in a knocking noise in most cases.
2000 Blazer 4wd, automatic, 122000 miles In the last couple of weeks, if the Blazer isn’t driven for 3 or more days, there is a slight knocking noise for 15 to 20 seconds after start up. Oil level and pressure are fine. I’m guessing it’s the lifters, but I’m open to any suggestions.
Where does the knocking come from on a cold start?
I noticed a knocking coming from the engine (closer to bottom of engine than top) on a cold start. It sounds like a rock being knocked against a hard surface. I can only hear the knocking if I am outside of the car, if I am in the car I can’t hear it at all. The knocking lasts for maybe 20-30 seconds.