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Test drove a 06 grand marquis with104,000 miles.made a soft knocking sound low in engine . Paperwork shows oil change due. Any other ideas?

Test drove vehicle developed soft knock low in engine idles and accelerates great.

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  • Cars & Trucks Master
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Probably valve lash due to lifter.

Posted on Dec 08, 2014

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3 Answers

I have a 2002 grand marquis and it was running perfect until yesterday.... It's making a knocking sound when you crank up the car and it get louder when you press the gas... It quiets down at one point but...


Hi just food for thought,the nocking would normaly mean the big ends where worn,but as you have sied that the oil pressure is low it could well be that the oil-pump is worn or filter of oil pickup is blocked.
hope this was helpfull.

Mar 25, 2015 | 2002 Mercury Grand Marquis

1 Answer

Test driving a 06 grand marquis,after about 30 miles it developed a soft knock low down in the engine. Any ideas


Could be anything, but it is usually not a good sign. If you haven't bought it yet, skip it. It may be time to rebuild the engine.

Dec 08, 2014 | Cars & Trucks

1 Answer

I have since put more oil in my car but a knock in the engine developed because I drove it while low on oil


pontiac cars are mainly junk (sorry but its true) especially grand am. Sounds like you threw a rod or bearing, but don't feel bad it would've happened whether or not you ran it low on oil, you just sped up the process :)

Mar 26, 2014 | 2001 Pontiac Grand Am SE

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My 94 grand marquis shut off seconds after a loud grinding noise that sounded like it was coming from the front left hand side. I tried turning it back on after it happened and the check engine and oil...


grinding sound is not good, there is a knock sensor on the engine if this registers a bad knock it will turn off ecu to stop more damage. has the engine been stud for a long time. when was the oil last changed. is there any thing obstructing the engine, is the engine burning oil or water is there a white film on the oil filler cap. please check these out

Jun 12, 2017 | 1994 Mercury Grand Marquis

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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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I have a knocking sound coming from the passenger side of the engine, and it all started when my mom drove it and said that the oil was really low and so she put more in now it sounds like we have a rod...


You should not blame *********** it could be that it has too much oil in it or since it was low to begin with and alot of miles you now have a rod knock that means you need to rebuild or replace your engin

Aug 23, 2011 | Hyundai Elantra Cars & Trucks

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2003 Taurus. Oil light came on. Checked level. Good. Drove another 5 miles, now have engine knock on top side of motor. Thought maybe oil pump malfunction. In the middle of nowhere, drove 50 miles home....


Before driving it anymore I would have someone test the actual oil pressure using a mechanical test gauge to see how much , or little, oil pressure you actually have. The knocking noise could be a hydraulic lifter that is partially collapsed due to low oil pressure or a rod bearing that has been damaged from low oil pressure. If it is just a lifter that is making noise then there's a pretty good chance that the lifter will quiet back down once the oil pressure is normal again. If it turns out that your oil pressure is normal both at an idle and at highway speeds then the noise may be unrelated. You can cause some serious damage by continuing to operate any engine that is low on oil pressure even if the dipstick shows it to be full of oil. Hope this helps and good luck!

May 10, 2011 | Ford Taurus Cars & Trucks

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Knocking sound as soon as the engine is cranked


SOUND LIKE PISTON RODS.LOW OIL LEVEL OR FAULTY OIL PUMP.DUE TO LACK OF OIL TO ROD BEARING CAUSING BEARINGS FAILURE.YOU WILL GET ROD KNOCK MEANING ENGINE DAMAGE.

Apr 07, 2010 | 2003 Buick Rendezvous

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I have a 2002 grand marquis,140 thousand miles...i change my oil on the regular,i take good care of the car..my problem is on my last oil change i noticed a slight tapping noise like the valves where...


a knock sensor is basically a resistor and a spring, and what it does is it reduces valve ping. Valve ping is when the fuel is not properly burned and tries to explode before the valve is fully closed and it will make a pinging noise when under load or at higher RPM. If the sensor is bad it can cause detonation, detonation is when the fuel explodes before the valve is closed and can cause a cracked, or exploded piston, bent valves etc. Your problem does not sound like that of a bad knock sensor, predominantly you will only hear the "ping" under load and not at idle and if it was bad your check engine light should be on. this sounds more like a rod knock. change the oil again and use only AMSOIL and an amsoil filter, amsoil is proven to last longer than any other oil, 600,000 miles without a change, or a filter change.

Feb 05, 2010 | 2002 Mercury Grand Marquis

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