Question about 1992 Ford Explorer

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THERE'S A LOUD PING NOISE/KNOCK ON THE CYLINDER HEAD WHEN ENGINE IS IDLING/TURNING. WHAT COULD BE THE POSSIBLE PROBLEM OR WHAT'S CAUSING THE PING NOISE? I AM NOT A TECHNICIAN. CAN ANYONE SUGGEST OR TELL ME ABOUT MY PROBLEM.

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  • rlcab Oct 12, 2010

    How do I get to the toppet/s and make the necessary adjustment? Please comment. Thanks a lot.

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It could be the tappit noise. The tappits need adjustment.

Posted on Oct 11, 2010

  • Rinoo Kumari Oct 12, 2010

    It is difficult for me and you to adjust the tappits. It need us to remove the tappit cover and use a gauge to adjust it at a certain angle of the crank shaft. Best left to the mechanics who have to tools and knowledge.

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Have an 06 Ra Holden rodeo v6 3.5 petrol. A very loud knocking noise has started, it has lost a bit of power. The noise seems to be louder when I rev the car. What could be the problem?


knocking usually called rod knock --possible spun a bearing on crank -other wrist pin damaged --piston rings damaged --other possible valve drop or bent ---need to do a compression check --to see which cylinder is causing problem

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Hi i have a Ford Explorer 2003 v8 4.6 L.


Sounds Like A Piston Connecting Rod Knock this Happens from #1 Poor Oil Circulation at that or all Rods thus Causing Severe Wear to the Rod Bearing Or #2 Abuse Such As Unnecessary High reving at sestained Hi RPM's and this Is A Major Repair that Involves Basically Rebuilding the Engine. A Trained EAR Can Diagnose A Rod Knock. I can Pick this Out Just After 10-20 Seconds. All I can Advise is for you to Go to A "TRUSTED" Mech./Tech. for Diagnosis. Im hoping this Helps you Find the Problem, I am Unable to HEAR the Engine so this is as Much as I Can Do for you . I truely Hate to be the Bearer of Bad News but I Call it like I See it .
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1 Answer

There is a loud whistling noise and shaking when idling, cel comes on and car will stall


Possible vacuum leak from one of the hoses causing unmetered air to enter the engine. Look under hood in engine compartment and listen for noise to see if it may lead to a disconnected/collapsed hose resulting in a vacuum leak and repair/reconnect as necessary

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My acura is making loud banging noise from front when idling. sounds like a missing spark plug but all spark plugs are fine. what could it be?


Can be a lot of things.

Could be a bad rod or rod barring.

Could be a clearance issue in a rebuilt engine.

I wouldn't run it until you Take it to a shop for diagnostic.

Nov 03, 2014 | 1998 Acura CL

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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

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

My loyale starts and runs ok, but makes a terrible noise, coming from the engine area. It sounds like a very loud knocking, clicking, sort of sound. It doesn't seem to affect the running of the...


hi a loud noise like the one you described can really only be a few things, either the main engine bearing is getting worn and is on its way out or you have a damaged or dirty lifter. The main difference between the two is the bearing will sound like a knock or grinding noise and the lifter will be more like a loud tick from either the left or right head on the motor you may just have to listen carefully to tell but it is possible and they will both speed up with the engine rpm. A bearing will usually cause problems running/starting/idling etc so maybe lean towards a lifter if it is damaged it will need an expensive replacement but try an oil change first as this can also free up dirt etc and solve the prob

Jun 02, 2011 | 1991 Subaru Loyale

1 Answer

Knock sensor


It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.
A knock sensor assures that you're getting as much power and fuel economy as is possible from your engine.


knock sensor
The knock sensor responds to spark knock caused by Pre-detonation of the Air/Fuel mixture. As the flame front moves out from the spark plug ignition point, pressure waves in the chamber crash into the piston or cylinder walls resulting in a sound known as a knock or ping. This is caused by using a fuel with a low octane rating, overheating, or over advanced timing. Sometimes it can be caused by hot carbon deposits on the piston or cylinder head that raise compression. A knock sensor is comprised of Piezoelectric materials; Crystals that when impacted, generate a voltage (same idea as a BBQ ignitor). This voltage is monitored by the computer, and when an irregularity is detected, the computer corrects timing in VVT (variable valve timing) engines, or triggers a DTC Diagnostic Trouble Code) in older vehicles.

Apr 23, 2010 | 1998 Honda Accord

1 Answer

1996 Mercury Tracer with sudden loud engine knock


Was the engine overheated when it shut down on the highway? If so, it probably seized due to a stuck bearing, when you restarted the engine, the bearing spun and now you likely hear a connecting rod knocking around in the engine without bearings. This will mean you need a new engine.
If the engine didn't overheat, then it's possible that a valve seat in the cylinder head fell out of place and is now banging around inside a combustion chamber destroying the engine and you will likely need a new one. This was a very common problem on one of the Ford based 4 cylinder engines, it depends which one you have. The major offender was a 2.0 litre.
Another possibility, the timing belt has jumped and the pistons are now hitting the valves, causing the engine to run rough. This will either require a major repair or a new engine.

Mar 11, 2009 | 1996 Mercury Tracer

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