Why does my Hilux make a knocking noise when cold start?
I have a 1KZTE which also will give slight valve noise in winter on cold start – goes away as soon as revs are off idle or within about 10-15 secs. This is normal as the engine needs to pump the oil up to the valves.
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 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.
When do you hear a knocking sound in your car?
When: This happens when I first start my car, typically in temps around and below freezing, there is a slight knocking sound. It seems to be coming from the engine and is in synch with the running engine. Its not so bad in the Park position or the Neutral position.
What causes a loud cold start knock noise?
I don’t think there is anything (maybe a rebuild) that will fix the piston slap. The lifter noise is usually dirt and, or wear, that lets the lifter “bleed down”. Sometimes as @ Conlan Rose suggested, it might be a slow to build oil pressure issue, that is caused by a dirty oil filter, sometimes it’s clogged oil passages.
When does the knock noise go away in the Cold?
The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures).
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
When does the engine knock noise go away?
Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures).