Question about 2002 Subaru Legacy

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2002 subaru 2.5 l engine pinging heavily going up hills. Timing marks all are on the money. No check engine light for the knock sensor. Not overheating and EGR appear to be working properly

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Try better gas for a tank and make sure it's the transmission is downshifting when you go up the hill. After that the valves may need adjusted or replaced.

Posted on May 12, 2010

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What does a knock sensor do


It detects spark knock, usually caused by preignition, and sends a signal to the pcm, so it can ****** ignition timing,so that the spark event occurs a little later, getting rid of the knock, or ping. This usually happens because we run engines on the ragged edge of what is prudent for timing advance, to optimize both power and economy, and when a sudden load is put on the engine, such as passing or going up a steep hill, the timing needs to be backed off to keep the engine from having spark knock.

May 12, 2011 | Buick LeSabre Cars & Trucks

1 Answer

2002 Nissan Maxima SE. It pings under a light load and tends to be both at lower speeds and now even on the freeway when there is a light load. When accelerating it's not a problem. I am not getting any...


Your knock sensors might have gone bad, allowing the engine to ping. The knock sensors would usually retart the timing, to stop that pinging. They don't illuminate the check engine light when they go bad, but the code will be stored in the ecm if they're bad. Have your engine codes read to see if that's the problem.

Oct 11, 2010 | 2002 Nissan Maxima

2 Answers

Engine cuts out and shudders at 3000 rpm won't accelerateobd code p0332 2002 jaguar x type 3.0 l


P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)

This sensor signals the engine-control computer when detonation is detected, momentarily retarding ignition timing until detonation ceases.

Most computer-controlled systems use knock sensors to ****** timing when the engine is experiencing pinging or knocking.


Obviously, a faulty knock sensor produces problems that appear to be ignition-system-related. If the knock sensor system does not provide an engine detonation signal to the PCM (powertrain control module), the engine detonates, especially on acceleration.
  • The first step in diagnosing the knock sensor and knock sensor module is to check all the wires and connections in the system for loose connections, corroded terminals, and damage.
  • With the ignition switch on, be sure that 12 volts are being supplied through the fuse to the knock sensor module.
  • A quick check of a knock sensor is to watch the ignition's timing while the engine is running and the engine block is tapped with a hammer.
    • The noise should cause a change in timing.
  • The knock sensor can also be checked by tapping near the sensor and watching for an AC pulse on a DMM or lab scope.
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May 01, 2009 | 2002 Jaguar X-Type

3 Answers

No power up hills and pinging noises come from TBI little back fire.


Sounds like the knock sensor has failed. It's on the passenger side at the bottom of the engine block, in front of the starter. One wire going to it. Have you checked the timing lately, maybe it has moved?

Apr 15, 2009 | Chevrolet Suburban 1500 Cars & Trucks

2 Answers

1988 f-150 engine knock under load


If I remember correctly, that vehicle may have had a knock sensor, depending on which engine. A quick drive to parts store and ask if they have one, will help you identify & confirm whether your particular engine has one. Another thing I remember is that the 5.0L with O.D. were very often carboning up inside the engine causing "Ping/Rattle" under load & even caused the transmission to shift in & out of overdrive hard & more often at those times. Had older fellow driving it and it very rarely went over 50mph, so it happened quite a bit. Would always find at least 1 or 2 plugs carboned up pretty bad, maybe the odd bad plug wire, and when replaced, pinging & hard, erratic shifting would disappear & run smooth. Just too low of RPM's when at normal driving speeds of 50 mph to clean out the carbon. Anyway, if trouble codes don't indicate knock sensor problem, or other, then I would pull the plugs & take a good look at them for carbon. If they're carbon covered, 1 or 2 or more, I'd be tempted to spray some combustion chamber cleaner into the throttle body as directed on can, and clean it out good, with old plugs still in, then replace plugs with new & see what you get.

Dec 13, 2008 | 2007 Ford F-150 Harley Davidson

1 Answer

1997 Subaru Legacy GT 2.5L


Check the knock sensor.

The light comes on when you climb a hill, accelerate quickly or do anything that advances the timing a lot and the knock sensor doesn't hear the knocks (pinging). The engine timing is not retarded, so you get a misfire.

The computer turns off the CEL if it sees the car start and run with no misfire of this nature 4 times in a row.

Aug 21, 2008 | 1997 Subaru Legacy

2 Answers

Check engine light for misfire cylinder 2 and 4


If the engine seems like it's OK but you are just seeing a solid Check Engine Light, and if the light has ever mysteriously gone out on its own, check the Knock Sensor. Over time they rust. I have had the repair done on my 2 subies (a 97 and a 99).

The CEL will go out on its own if you have 4 starts with no misfires. If the knock sensor is out, rapid accelleration or steep hill climbing will make the light come back on as the timing advances and the sensor does not ****** the timing for you, so the knocking becomes a misfire.

May 22, 2008 | 1997 Subaru Legacy

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