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Thank you I will check dose items , an other question I have is there is a knock ( Ping ) sound each time I press the gas to go faster and under the speed 30 MPH it smooth the sound down.?

Ping sound at engine area , I checked the cat muffler and is not damage, I wounder if it has something to do with the knock sensor??

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You need a professional to road test it
with a scan tool, to look a data & go from there

Visual Checks you do, are of no value

Have to be aware of Preventative Maintenance
& component test to find a problem

Posted on Nov 24, 2014


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SOURCE: Check engine light

Yes, the speed sensor is really easy to get to after you jack the car up. The trans. computer is detecting something is wrong and puts the car into "limp in" mode. I've seen alot of these speed sensors go out on the Chrysler products.

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SOURCE: engine ping

Make sure you are running premium fuel. Also check egr tubes and make sure they are clean and also check egr vlave. May be clogged or just plain worn out.

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SOURCE: Engine Ping

try a higher grade of gas..

Posted on Feb 15, 2009

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SOURCE: Check Engine light on!!!!!

its the O2 sensor for sure. normally, its good practice to change the sensor when changing out the muffler and cat system. doing it all together will prevent the sensor from faulting.

Posted on Mar 11, 2009

  • 62 Answers

SOURCE: 1997 mustang cobra engine ping

you have a rod knocking this is a serious problem the more you drive it the worse it will get
it could also be a warped push rod but thats a slim chance

Posted on May 01, 2009

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2 Answers

What happens when you drive without a gas cap

ok on todays automobiles the gas cap does more than just seal the gas tank. Now they run a return line to the tank. this does 2 things. it returns un used fuel and vapors back to the tank , and it pressurizes the tank to help improve the fuel pump.

Now as it is possible running without the gas cap may cause problems I am not 100 % positive that is your only problem.

It sound like the knock sensor is detecting the knock you mentioned and is trying to retard the timing to fix it . In doing so it has retarded it to far causing the engine to loose power and eventually stall. I would first replace the gas cap. then run a good gas additive to a full tank of gas to clean out any water and dirt that may have gotten into the tank while the cap was off. now the issue of the knock as you described. is it a knock or a ping? A knocking sound is loud metallic hammering noise. a ping is a ting not very loud. if it is a loud metallic sound I would have a reputable mechanic check it soon, as it could be a serious issue. Ping can be caused by bad or weak gas or cheap low octane gas. I would run a mid grade gas in it and see if it fixed the issue.

Jun 02, 2014 | 2004 Dodge Neon

1 Answer

What causes a 1989 nissan pickup ping or knock?

Pinging or detonation is caused by the spontaneous combustion in the chamber from incorrect air/fuel ratio and timing. It is most prevalent in lean mixtures under load. Run the fault codes and check for faulty HO2s and O2 sensors as they tell the ECM what mixture and timing is required to stop it

Apr 25, 2014 | Nissan Pickup Cars & Trucks

1 Answer

Engine knock

caused by hot and lean.
which engine.??? at least 3 choices.
most have knock sensors. and will not knock.
if it really is knock then that is serious.
knock means detonation or ping.
if its just noise say that,
real PING happens under load.
1: check fuses.
2: check knock sensor for outside damage.
3: SCAN the PCM. do you have any DTC errors/
4: do a full 60k tune up. maybe its lean because the fuel filter is clogged.

Mar 23, 2014 | 2000 Jeep Grand Cherokee

1 Answer

Why does my motor ping when under load i changed knock senser

Generally a Pinging noise isn't due to a knock sensor. It sounds like you may have Detonation issues.

I'd really check your spark plugs to make sure they are not fouled as well as running some higher octane gas to see if it helps.

basically, your getting combustion earlier then you're supposed to. This could be to various reasons.

Check in this order, Spark, Timing.

Check to make sure the spark plugs are all sparking and clean / properly gaped. Pull one coil/wire at a time off the plug to see if the pinging stop (pull a wire, start the car. Turn off car, re-attach wire, move onto next plug.) If it stops on a specific cylinder that means you're having detonation issues on that cylinder. If it never stops, then it sounds as though it could be timing related or have a valve train issue.

We'll start here and move on. Let me know what comes of this!

Mar 01, 2011 | 1994 GMC Sierra

1 Answer

Where is the knock sensor located and what does it look like?

Your vehicle is equipped with 2 knock sensors. They are located on the cylinder heads under the intake manifold. They look like the picture below.

NOTE: Most knock sensor codes are caused by mechanical problems with the engine like pullies that are "rattleing" or lifters that are "tapping" etc. The knock sensor does not know the difference between "ignition ping" and mechanical problems like those mentioned. Knock sensor codes set when the engine computer has retarded the ignition timing as far as it can in an effort to stop ignition ping and the knock is still present. This is usually because the problem is not caused by ignition ping.


Feb 22, 2011 | 1994 Lexus Es 300

1 Answer

I have a 2002 grand marquis,140 thousand miles...i change my oil on the regular,i take good care of the 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

1 Answer

2002 explorer ping during acceleration until it shift to 3rd gear

the knock sensor senses knock and sends a signal back to the engine computer to ****** timing and adjust fuel patterns. however the electrical system can only handle so much. the ping is caused by colliding flame fronts inside the engine, the combustion chamber gets too hot and creates a flame front aside from the one created by the spark plug. this can be eliminated by using higher octane gasoline which speeds up burning eliminating the gasolines exposure time to the hot combustion chamber. if this does not work try checking your EGR system, the system pumps idle gas back into the engine to lower combsution temperatures, happy motoring

PS give the car atleast 2 fillups on premium gas before moving to the egr valve give it time to work out the low grade stuff

Aug 26, 2009 | 2002 Ford Explorer

2 Answers

Noise when i mash the gas in drive at a speed about 40-50 miles

If carb is adjusted properly, try backing your timing off slightly until noise disappears on acceleration , as it sounds like timing "ping"
Other thing that may be causing it is poor octane fuel. You shouldn't have to run premium, so I would check timing & if you don't have a light, just turn distributor a little at a time and test drive it until it's gone.

Aug 09, 2009 | 1986 Chevrolet Caprice

4 Answers

Knocking/pinging sound when stepping on the gas for power.

you will distroy the engine if you continue to let this noise happen.
the timing must be retarded to get the ping out if its that bad.
most of the time if its just a little bit though filling the tank with super unleaded will take out the noise.
the distributer must be loosend and turned in the correct way to ****** the timing and the idle must be put back up to compensate.
the distributer is the ignition timing.
the other thing that could have happend is the timing may have jumped time on the timing belt itself.this is a complely different timing.
this timing is valve timing.
the distributer is ignition timing.
when the distributer is turned you are changing the ignition timing .
you say in your text and i quote .

The service tech only adjusted the distributor fas far as he could to lower the idle.

a tech should never be turning the distributer to lower the idle nor should this be explained in any way to the customer.

if a tech says he dosent understand something stop them rightaway and get your car out of there or get someone else to talk to .
10 times out of 10 if the tech dosnet get it the car wont get it either.
have a competent service tech test and conferm the timing belt or chain timing .

keep me posted

thank you

Jul 29, 2009 | 1995 Nissan Pathfinder

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