When did my Jeep Cherokee start making knocking noises?
I bought the Jeep new in February/March of 2007. In December 2009, at approximately 45k miles, I heard a loud knocking noise that sounded like it was coming from the bottom end of the engine. Took the Jeep to my regular oil change center and they confirmed the knocking sound.
What does it sound like when someone knocks on your engine?
It sounds like someone keeps banging on your oil pan with a hammer, rhythmically rap-rap-rapping. If your car’s has a broken engine you can consider selling your car online or read on about engine rod knock. But there’s no one under your car and no one is knocking on your engine. The noise comes from deep in the bowels of your motor.
Why does my Jeep Wrangler 4.0L make a noise?
My 1999 XJ Cherokee’s 4.0L engine has had a subtle noise since we bought the Jeep at 94K miles. It sounds exactly as you describe. The sound could easily be mistaken for a valvetrain noise but goes away as the engine warms. A rod bearing or valvetrain noise will not go away.
How long does piston knock last on Jeep Wrangler?
Even after that, there is some knock while engine is cold, that lasts about 2 minutes when engine is cold. After warm up knock is gone. In three years things were not getting worse, even knock is still there.
What does rod knock sound on Jeep Wrangler mean?
The sound could easily be mistaken for a valvetrain noise but goes away as the engine warms. A rod bearing or valvetrain noise will not go away. Hydraulic lifters bleeding down will likely continue after the engine warms up.
My 1999 XJ Cherokee’s 4.0L engine has had a subtle noise since we bought the Jeep at 94K miles. It sounds exactly as you describe. The sound could easily be mistaken for a valvetrain noise but goes away as the engine warms. A rod bearing or valvetrain noise will not go away.
Why does my car make a knocking noise when I Turn on the engine?
Low oil pressure can be caused by a clogged line, a bad pump, or a clogged filter. The low oil pressure would rob the engine of the oil it needs and produce a knocking sound. The oil pressure can be tested with a gauge. If the issue is mechanical, it may be a piston or valve issue.
Why does my Jeep Wrangler make a piston slap sound?
The sound could easily be mistaken for a valvetrain noise but goes away as the engine warms. A rod bearing or valvetrain noise will not go away. Hydraulic lifters bleeding down will likely continue after the engine warms up. A lean fuel mixture during warm-up phase can sometimes mimic a piston slap or pinging.