Question about 1999 Pontiac Firebird

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When the engine is running it has a real bad knock i've been through the rockers and the transmission and i don't know where else to look.

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This is a bottom end problem - you could have a spun rod bearing cracked a piston skirt you will have to remove the engine and pull the oil pan and check the rods

Posted on May 18, 2011

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Engine knock 02 Jeep Liberty 3.7, its not the rockers.


Could be a bearing. If so could be expensive. If its a straight 6 could be a host of things, head crack that has over heated engine makes it sound like a diesel, bad lifter, you need a mechanic to look before real damage is done

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Check engine light on but no codes


The check engine light will come on when the ECM detects knock, it will only stay on if excessive knock is detected. I would replace the fuel filter and check your fuel pressure.
Could also be a bad knock sensor as the ECM will also advance the timing to make the engine knock. If on knock is detected when the ECM is doing this it will light the check engine light.

Apr 18, 2017 | 1987 Chevrolet Suburban

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2002 2.7 liter chrysler has a knock in the engine. sounds like it is coming from the valves


if the car has alot of miles on it , a little bit of top engine noise is nothing to worry about. if the car does'nt have alot of miles on it or the noise is real loud then you may have a lose valve or need rocker arm ajustment.

Aug 26, 2012 | Cars & Trucks

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I've spoken to several mechanics on my Explorer. I lost oil pressure and drove it home from work around 30 miles, it started knocking really bad. I had just changed the oil, they are stating I wou


Yes, I agree. Overhaul, or new engine time. Loud knocking indicates your crankshaft bearings are toast-it won't be long before a piston rod goes through the block, or the engine siezes up. Overhauling an engine with a bad knocking means a complete teardown and rebuild-very time-consuming, labor intensive, and very, very expensive. You might want to consider a used replacement engine with low miles as a cheaper alternative. Good luck.

Jan 26, 2012 | 1998 Ford Explorer

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89 gmc c2500 5.7 tbi had oil changed at well known franchise place. They also recommended flush out, let run 15 min with stuff he put in oil. Then drained, added oil and was about 1/2 mile away when motor...


Hi, this is not the first time i've heard of this problem..I have repaired engines with rod knock, crank bearing knock and piston slap after these treatments. These products can clean so much carbon and varnish from the engine that it brings the real internal problems to the surface. Try using thicker oil

Jul 25, 2011 | 1985 GMC C2500

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Sound like a lifter knocking took off vaule cover all were ok not too tight not too lose just had head gasket replaced never knocked before that any other ideas top of motor is apart heads are off too


Your problem could be a lifter that's either pumping up or leaking down which wouldn't be evident when you check the rocker arms for play with the engine off. You can use oil deflector clips and a mechanic's stethescope to run the engine with the valve cover removed and isolate the lifter in question. If you had a bad head gasket and had coolant leaking into the oil, it's also possible that you're mistaking the sound of a bad rod bearing for a lifter noise. Hopefully it is just a bad lifter.

Jun 26, 2011 | 1997 Chevrolet Blazer

1 Answer

Engine is knocking needing to know anything and everything that could cause this. We just replaced the transmission a week ago and we have an O2 sensor out.


Engines can make many different noises and people will describe them as knocks, pings, rattles or thumps. A true "knock" is caused by rod or main bearings hitting against the crankshaft. The general cause of that is either too much space between the bearing and crankshaft or insufficient oil pressure to maintain the distance between the bearing and crankshaft. Sometimes you can use a heavier grade oil so that the oil doesn't leak out of the bearing space so quickly. If you're currently using 5 W 15, go to a 10 W 30 or maybe even a 15 W 50. If you can't make the noise go away with that, either the bearings are too worn or it's a different problem. If the engine has less than a couple hundred thousand miles, the only reason for bearings to go bad would be inadequate maintenance.

Other problems that can result in noises like that are:

Piston slap. That's when the skirt (lower part) of the piston is slightly worn and is enough smaller than the cylinder that the skirt "pops" from one side to the other as the engine runs. It's more of an annoyance than a real problem, especially since piston slap typically goes away as the engine warms up a little. It typically takes just a few seconds to go away. If it's piston slap don't worry about it until the engine is rebuilt. Piston slap is quite common among many of the GM 350's, especially in engines that go short distances a lot or don't get adequate maintenance.

Fuel "pinging". That's when the fuel ignites too quickly and causes a sound like something rattling around inside the engine when you step on the accellerator. Use a fuel octane booster or change the engine timing.

Hydraulic lifter noises sounds more like a tapping sound and is usually caused by inconsistent oil changes

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Jun 10, 2011 | 1998 Saturn SL

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