Question about 1999 Chevrolet Silverado 1500

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Replaced both knock sensors in 1999 silverado 5.3L. had computer re-programed for updated bulletin that was supposed to help engine knock and bring false knock codes from coming on. after a couple days, the light comes back on and the dealership cannot figure it out.

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If the Knock sensor wire is located near the Ignition coil wiring the electro magnetic interference from the Ignition coil can rub off on the knock sensor wire causing the brain to think the knock sensor is sending a code.

You can place a millivolt meter across a knock sensor and tap it with a screwdriver and read voltage. If it doesn't read a voltage the sensor is bad. Its job is to generate a voltage.

Also, Using a timing light the distributor must be set to spec, if not this will trigger the knock sensor. Another trigger could be a bad temperature coolent sensor screwing with the fuel and timing, causing a knock. Some bad coolent temp sensors do not display a code when they're at fault, some simply slip under the radar. Usually when the temp sensor is bad the engine will not idle properly, or hesitates in most cases. The knock senser must have a good ground to the head or block, Do not use any thread tap or compound that would prevent a ground of the sensor.

Posted on Jun 04, 2010


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Related Questions:

1 Answer

Can knock senor cause a engine to go to reduced power

Yes. The sensor is supposed to notice vibration such as spark knock and the computer would reduce spark timing to correct it.

Feb 11, 2014 | 2004 Chevrolet Silverado 2500HD

1 Answer

2000 silverado knock sensor issue

I think it not real probable that the cause of your knock sensor code is the result of bad gas. However, I suppose it IS possible. Most knock sensor codes are caused by engine mechanical problems like bad pully bearings, loose timing chains, broken valve springs, collapsed valve lifters, etc. that would cause a "knocking" or "tapping" in the engine.

The next most probable cause would be damaged knock sensor wiring. I have fixed many that have had damage from rodents getting into the engine compartment and chewing on the wires. Depending on which engine your Silverado is equipped with, the knock sensor could be mounted between the cylinder heads in the valley under the intake manifold. Mice like it under there.

Then again, it all depends on WHAT KIND of knock sensor code you are getting. For 2000 Silverado there are 3 possible knock sensor codes: P0325, P0327, P0332. The diagnostics (and possible causes) change depending on which code you have.

Jan 06, 2012 | 2000 Chevrolet Silverado 1500

1 Answer

How can i manually reset the computer on my 99 chevy silverado 1500 4x4? my oil pump is weak and it has a dry start and when i started it this mornin i think it kicked the knock sensor and shut my motor...

The knock sensor will not cause a no-start. The knock sensor only retards the timing when the engine is running. If the starter is not working we need to check the battery voltage, battery cables, starter, engine ground, neutral safety switch, ignition switch, security system. These are the only things that can cause a no crank.
If you really have the urge to clear your computer disconnect the negative battery cable for 10 minutes.

Mar 10, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

How many knock sensors on z71 model 1999.went to get it smogged they said i had two codes for knock sensors.

There is one the other code is from what is called the PROM KS calibration. KS meaning the knock sensor PROM refures to a programable compount that plugs into your computer. The knock sensor derturmins the timing for the IC control so how much dose the computer eighter advance or retarde the timing under differant engine speeds and conduitions. Change the knock sensor and you should be OK

Jan 05, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

2002 chevrolet silverado 1500,4.8 engine.. were does it have the knock sensor and whats is funtion?

There's two knock sensor's, and there under the in-take, on top og the engine, when the knock sensor detects a knock on the engine block, it will send a signal to your compute to adjust the engine timing.

Jul 06, 2010 | 2002 Chevrolet Silverado 2500HD

1 Answer

How to replace the knock sensor on a 1999 chevy silverado 1500

The knock sensor is llocated on the left side of the engine block and is a single wire connector. Disconnect the wire and simply unscrew the sensor. Don't worry. There will be no fluid leaking. No tricks.

Mar 25, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Knock sensor bank 2 sensor were is located? I can't find it, please help me locate the knock sensor ?

V6 or V8? On 4.8, 5.3 and 6.0 it is under the intake. You have to remove the intake manifold.

Sep 07, 2009 | 2001 Chevrolet Silverado 1500

2 Answers

More knock sensor blues

Forgive me for asking, but are you sure you replaced the knock sensors? They are underneath the intake plenum. I'm just wondering if maybe you replaced the Oxygen sensors by accident. Anyway, so that you know, this is a very common problem (the knock sensors). Gm has issued a bulletin, something to do with the rear knock sensor under the intake getting contaminated by water, and they recommend a new sensor installed with silicone around the gasket to protect it. Also, the wiring harness is particularly tasty to rodents and they get in there and eat the insulation and wires! You have to inspect the harness carefully when you have the intake off because you can't see it when it's all together. Seen this twice now.

Mar 08, 2009 | 2002 Chevrolet Silverado 1500

1 Answer

Service engine soon light is on and when hooked up to the computer at auto zone it mentioned a knock sensor issue. Is this common? Also is this something easily changed? It is a 2002 Z71 with about...

The knock sensor is easily replaced. If you look below the passenger side exhaust manifold, you should see it sticking out of the side of the engine block. it'll have an electrical connector, that once unplugged, will allow you to unscrew the sensor from the engine block. I hope this helps.

Jul 29, 2008 | 1999 Chevrolet Silverado 1500

6 Answers

1997 Chevy Silverado problem

hi, ok I'm sure you tried alot of solutions, I think the ECU has governed the engine must have sensed a previous problem or its just a malfunction from a sensor, important sensor to check is the 'engine knock sensor' try disconnecting and reconnecting it or test with multimeter and compare all readings with a new engine knock sensor or disconnect and reconnect battery, the other way might be to reset the engine managment system, this however I dont know but your dealer can do this for you.

May 25, 2008 | 1999 Chevrolet Silverado 1500

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