I did a koer test on my 1986 bronco with EFI 302 and came up with a code. Its for the knock sensor. I have looked all over the engine but couldnt find one, maybe im just blind. But does anyone know where this is? Any way of testing it to check if the sensor it bad?

 

My under standing is it on the back of the block kinda to the pasenger side, its a PITA to get to. there shoud be a tes procedure in the haynes book. Good luck DW

 

This may sound funny but my Chilton's method for testing is to rap on the block with a hammer or such and see if it retards your timing. lol

 

Thanks alot!

 

That's the same procedure prescribed by Ford in their service manuals.

Here's the first part of your knock sensor test. From here, it branches out three ways. Let me know what you get and I'll post the follow-up:

DG1 SERVICE CODE 25/225: GENERATE KNOCK MANUALLY


Service Code 25/225 indicates that the Knock Sensor (KS) signal to the processor was not sensed during the Dynamic Response Test after the ID code in Key On Engine Running Self-Test.

Possible causes are:

-- Damaged knock sensor.

-- Open or shorted harness.

-- Damaged processor.

NOTE:
Since knock conditions are sensitive to fuel, altitude and weather in addition to ignition timing, perform Step DG1 before servicing any components.

l Locate knock sensor and prepare to rap/tap the engine block close to the sensor with a 4 oz. hammer.

l Run Engine Running Self-Test (engine must be at operating temperature).

l Tap the engine block close to the knock sensor immediately after the Dynamic Response code is given.

NOTE:
It is not necessary to "goose" the throttle. Ignore all other codes except Code 25/225.

l Is Service Code 25 or 225 present?

Yes
GO to «DG2».

No
Knock sensor system OK. RERUN Engine Running Self-Test and SERVICE any other codes.

DG2 CHECK KS CIRCUIT VOLTAGE


l Key off.

l Disconnect knock sensor.

l Key on, engine off.

l Measure voltage between KS circuit and SIG RTN circuit at the Knock Sensor vehicle harness connector.

Voltage is between 1 and 4 volts
GO to «DG6».

Voltage is less than 1 volt
GO to «DG3».

Voltage is greater than 4 volts
GO to «DG5».

 

That's the same procedure prescribed by Ford in their service manuals.

Here's the first part of your knock sensor test. From here, it branches out three ways. Let me know what you get and I'll post the follow-up:

DG1 SERVICE CODE 25/225: GENERATE KNOCK MANUALLY


Service Code 25/225 indicates that the Knock Sensor (KS) signal to the processor was not sensed during the Dynamic Response Test after the ID code in Key On Engine Running Self-Test.

Possible causes are:

-- Damaged knock sensor.

-- Open or shorted harness.

-- Damaged processor.

NOTE:
Since knock conditions are sensitive to fuel, altitude and weather in addition to ignition timing, perform Step DG1 before servicing any components.

l Locate knock sensor and prepare to rap/tap the engine block close to the sensor with a 4 oz. hammer.

l Run Engine Running Self-Test (engine must be at operating temperature).

l Tap the engine block close to the knock sensor immediately after the Dynamic Response code is given.

NOTE:
It is not necessary to "goose" the throttle. Ignore all other codes except Code 25/225.

l Is Service Code 25 or 225 present?

Yes
GO to «DG2».

No
Knock sensor system OK. RERUN Engine Running Self-Test and SERVICE any other codes.

DG2 CHECK KS CIRCUIT VOLTAGE


l Key off.

l Disconnect knock sensor.

l Key on, engine off.

l Measure voltage between KS circuit and SIG RTN circuit at the Knock Sensor vehicle harness connector.

Voltage is between 1 and 4 volts
GO to «DG6».

Voltage is less than 1 volt
GO to «DG3».

Voltage is greater than 4 volts
GO to «DG5».

 

Do a search using Knock Sensor it'll come up with some thread's on where it's located!