Question about 1999 Lexus RX 300

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Rx 300 1999 I have a engine knocking sound. I use plus gas , new engine oil ,also engine treatment, new spark plugs. egine light on. Help me thank you.

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Have an OBII scan (fault scan) done. Scan will identify what triggered light. Any good parts store (Autozone, Advance, etc..) will do scan FREE

Posted on Mar 16, 2011

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1998 Licoln Continental 4.6 liter VTech


The fact that you have indicated the knock is in a very specific area of the engine indicates to me that the knock is there while idling and with you listening with the hood open. Spark knock, the kind that is caused by using lower-than-recommended octane gasoline, usually only happens when the engine is under load, not at idle.
I think you have a mechanical problem - valves, lash adjusters, maybe the cam itself. Do a compression check. If you have valves not working properly or not closing properly, this should help you find the area to check for damage.

Mar 04, 2017 | 1998 Lincoln Continental

1 Answer

Knocking engine


You may have pumped a tank of bad gas originally. It might have had water in it along with some other bad stuff. The knocking could have been the water - water will not compress like gasoline will.
I think I would take a sample of whats in the tank and examine it.
You may have to try flushing out the fuel system including the injectors.

Mar 05, 2014 | 1998 Lincoln Continental

1 Answer

Engine loud


If this is knocking is coming from within the engine, some possible causes could be using too low grade of fuel (regular vs plus or premium if your vehicle calls for higher grades), some timing issues, needing to replace your spark plugs (may have incorrect or worn out plugs), or plugs & wires if your vehicle has both (some do not), some internal combustion issues, or possibly even problems with rods/bearings. How's your oil pressure??? Are your gauges reading low? This can be a cause! Sometimes vehicles will "knock" if the oil level drops too low, or it may not knock until the oil in the engine has been depleted. (You could be facing serious engine problems if this happens!) If you keep your oil checked and at the accurate levels, and keep it and the filters changed regularly to ensure "clean" oil in your engine, this helps with lubrication of the engine parts, helping with lessening of the wear and tear on the engine, as well as extending the life of your engine. (It is also helpful to let your engine idle for a little while and warm up before driving (especially with rapid acceleration habits) to allow the parts to become lubricated, especially in cold weather). If you try upgrading to plus or premium fuel in your car, and it doesn't help, make sure your engine oil level is okay. If you're unsure, ask your mechanic to check things out for you. You may just need a good tune up. Regular service and maintenance is essential for your vehicle's engine and major components, and also to lengthen the life of your vehicle, especially the older your vehicle is and if it's considered a "high mileage" vehicle. I'm no mechanic but I grew up in a family of mechanics and do know a few things about vehicles. Hope this helps!

Mar 01, 2014 | Chrysler Cars & Trucks

1 Answer

Is my engine shot? car turns over, sometimes is starts


don't think the oil had anything to.do with it you might of crossed the spark plug wires when is the last time you replaced your spark plug wires, these can cause the problem, also cap and rotor, plus fuel filter to cleaning fuel injectors to, I find Lucas fuel treatment works great, been using it on customers cars and trucks now for 6 years and get good feed back but first start out to make sure you have spark, and fuel haven't worked on these, but your timming chain/belt could of jumped or stretched out make.sure you have fuel pressure

Dec 05, 2013 | 2005 Mazda RX-8

1 Answer

I need to know what code p0326 means for a 2001 kia sportage. i know it a knock sensor code what do i do with information.


Knock sensor is an indication you are having a mis-fire with your spark plugs if one fires and another misses causes the engine to knock 3 possible issues.

Spark plugs

Older vehicle may need gas treatment

Worst case valve or cylinder seal issue
Try the first issues dont change knock sensor it maybe doing its job

The last solution you shouldnt need to do unless you are getting black smoke from exhaust or engine is knocking realy bad

Oct 15, 2013 | 2001 Kia Sportage

1 Answer

Service Engine light is on, gas milage is poor getting est. 9mpg city (average 1990 dakota est. 20 mpg city) I put in a new airfilter in car, did a oil flush, changed oil and oil is still clean after 50...


if you have'nt replaced those spark plugs and wires lately, you need to.and also, lucas fuel treatment, in my personal opinion,is the very best for unclogging fuel lined and injectors.it being below a 1999 model and your check engine light is on, you can have it coderead for free if you're near anautozone or advance automotive parts store. they will code read it and tell you why that check engine lights coming on.hope this helps and thank you for choosing fixya.com

Nov 23, 2010 | 1990 Dodge Dakota

1 Answer

Oil light on @ idle


its a high mileage engine.
all you need to do is use a thicker oil and the light will go out at idle speeds.

use a 50w sae valvoline racing oil.
plus stp oil treatment.

do that and that light is all gone.

Aug 19, 2009 | 1999 Volvo S80

4 Answers

78 corvette that has not been started in 3


1.) put aside about $50 that you are ging to spend... period
2.) drain the oil and remove the old oil filter
3.) install a new oil filter, add new 30W oil
4.) remove all 8 spark plug wire from the 8 spark plugs
5.) remove the 8 spark plugs
6.) spray about 5 seconds of WD40 into each of 8 spark plug holes
7.) spray the remainder of the can into each of the 2 valve covers thru the EGR holes (pull out the EGR valve first)
8.) making certain that you have a full battery charge, turn the starter switch to START for about 5 seconds... if your engine turns then your internals are not frozen... that's good
9.) open another can of WD40 and spray equal amounts into ecah of 8 spark plug holes a second time
10.) turn the start switch on for another 5 seconds and listen for strange sounds... by the way without the spark plugs the engine will rotate more quickly than you normally expect... not a problem because as it turns it is lubricating your internal parts
11.) wait a minute and then turn it on for for about 10-20 seconds while listening for scraping or knocking sounds... if none heard then you are all lubed up and ready to reinstall the spark plugs.
Install new plugs or sandpaper the old with the correct gap ( I believe .035")
12.) if you didn't mark the plug wires not a problem... Google '78 Chevy Distributor Firing Order to find terminal #1 on the distributor cap... usually about the 1 o'clock position
13.) install #1 wire to #1 sparkplug... the driver's side front closest to the radiator
14.) the distributor rotates like a clock (clockwise) and the numbers on the clock starting at #1 is 1-8-4-3-6-5-7-2.... this is the firing order in a clockwise direction
15.) take the next plug wire #8 and connect it to #8 spark plug
Note: the spark plug numbers are cast into the top of the intake manifold for easier identification
16.) conect the remaining wires to their respective plugs
17.) make certain that you have a full battery charge, some gas in the tank (gas evaporates over 3 years) and a full radiator.
18.) Turn the starter switch and listen for the engine to start
19.) If it doesn't start the first time, try again and wait for the gas to reach the carburetor.... try again
20.) if it still doesn't start spray some engine strating fluid into the carbuetor throat and try again... it should start
21.) if it starts but doesn't keep running then repeat step 20. unitl the gas reaches the carburetor and continues to run on its own...!

Jun 23, 2009 | 1994 Chevrolet Corvette

1 Answer

Fixing error code po350 (ignition coil malfuntion)


yes this code is a coil issue and without getting very deep it can be triggered by a defective spark plug, the knock sounds like maybe a carbon knock, run a coup[le of cans of upper cylinder cleaner in the gas tank when u fill, STP gas treatment is one of these products, if the knock persists then have the dealer check for a hard carbon problem in cylinder's or a possible piston or engine rod bearing noise.

Apr 01, 2009 | 2002 Nissan Sentra

1 Answer

Engine knocks at startup


It could be the oil pump, its not a bad idea to check the type of engine oil you are using maybe you can go a little higher in grade,
you can also try to use STP Engine oil treatment for petrol (gas) as addative to the engine oil it may help.
Hope this helps!

Feb 27, 2009 | 1978 Pontiac Bonneville

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