Where is the knock sensor for a 4 cylinder Malibu 2009

Dear Earl,
You have not supplied me with the year, make, or model of the vehicle, but for the past (about 20) years, the most common answer to your problem in the USA would be a bad "coil pack".
This is usually a tall skinny plastic thing that makes the spark for the spark plug, and has a wire connection on the bottom to energize it.
The top of it has either a hole for the spark plug wire, or a wire that goes to the spark plug.
The number of coil packs are according to the number of cylinders/spark plugs in the engine. ( Usually 4 or 6.)
God bless your efforts.

IGNITION KNOCK (DETONATION) SENSOR the knock sensor Is on the back of engine (driver side on LHD vehicles) under the cam position sensor. it is a giant PITA to change. i had to cut a wrench in half (7/8 i think??) and use a pry bar to break loose the sensor..
((found this info from a Suzuki forum.))

So how bout that knock sensor Suzuki Forums Suzuki Forum Site

Ignition Knock Detonation Sensor fits 1999 2009 Suzuki Vitara XL 7 Aerio

http://www.autopartswarehouse.com/shop_parts/knock_sensor/suzuki/vitara.html

P0325 Knock Sensor Diagnosis EricTheCarGuy

4 cylinder engines generally have 2 knock sensors
1 is between 1 and 2 cylinders located more towards no 1 cylinder and the other is between 3 and 4 cylinder located more towards cyl 4

Here's a link to your knock sensor Luis. SAVE 20 GET 10 GIFT CARD ON ONLINE SHIP TO HOME ORDERS OF 100 OR MORE Here's a new knock sensor. http://www.autozone.com/engine-management/knock-sensor/duralast-knock-sensor/mazda/mazda6/2006/4-cylinders-c-2-3l-mfi-dohc/828292_0_0

Here's a link to the knock sensor,picture is not too good. SAVE 20 GET 10 GIFT CARD ON ONLINE SHIP TO HOME ORDERS OF 100 OR MORE Here's another link to a new knock sensor. http://www.autozone.com/engine-management/knock-sensor/duralast-knock-sensor/mazda/mazda3/2005/4-cylinders-2-3l-mfi-dohc/416412_0_0

Six-speed automatic transmission is available with both four-cylinder and V-6 engines in a 2009 Chevy Malibu. -----------------------------------------------------------------------------------
Digiprog 3

Off of the main engine harness in front of the engine, you'll find a lead that goes to the coolant temp sensor, and just after that a little lower towards the driver's side you'll find the Knock sensor lead.

p0304 misfire on cylinder #4
p0325 knock sensor circuit

Could be a bad wire, plug, or coil pack on cylinder #4 (or bad distributor connection).

Knock sensor indicates a knock coming from the engine, perhaps from cylinder #4.

This may lead to a diagnosis if you change parts related to cylinder #4.

Good luck.

1 - High Tension cable

• 4 to 8 Kohms
• With suppression connector and spark plug connector
• Only remove and install spark plug connector using tool T10029

2 - Ignition coil with output stage (-N70-, -N127-, -N291-, -N292-)
Connection, ignition wires:

• HV1 = Cylinder 1
• HV2 = Cylinder 2
• HV3 = Cylinder 3
• HV4 = Cylinder 4

3 - 10 Nm 4 - Connector

• 6 pin

5 - Knock sensor 1 -G61-*

• Contacts gold plated
• Fitting location: Cylinder block intake side

6 - 2-pin connector

• For knock sensor 1 -G61-
• Contacts gold plated
• Do not interchange

7 - Knock sensor 2 -G66-*

• Contacts gold plated
• Fitting location: Cylinder block intake side

8 - 2-pin connector

• For knock sensor 2 -G66-
• Contacts gold plated
• Do not interchange

9 - 20 Nm

• Tightening torque influences the function of the knock sensor

10 - Spark plug, 30 Nm

• Type and electrode gap See test data, spark plugs.
• Remove and install with 3122B

11 - Connector

• Contacts gold plated
• 3 pin

12 - 10 Nm 13 - 100 Nm

• Use counter- hold tool 3415 to loosen and tighten

14 - Camshaft sprocket

• With rotor for Camshaft Position (CMP) sensor

15 - Camshaft Position (CMP) sensor -G40-* 16 - Bracket

• For Camshaft Position (CMP) sensor

The knock sensor is on the back side of the engine near the trans. It is round, with a 1 wire connector. You will have to get it from underneath. Good Luck.