Re: OBD code p0327 and manifold gasket replacement


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Posted by OnBelay (76.84.35.30) on 22:24:47 06/09/12

In Reply to: OBD code p0327 and manifold gasket replacement posted by Wait Griswold

The knock sensor on the 454 is on the LR side of the engine, to the rear of the engine mount...not under the intake.

With that said, anytime you have a condition "arise" within two miles of leaving a repair shop after this much work, I don't think you should be afraid or intimidated from immediately returning and *asking* them to check it out. If you approach as with a display of reasonable concern and don't treat them like an accusatory prosecutor, you should have positive results.

This is the type of situation where it is extremely helpful to have a relationship with a repair shop. Any decent repair shop operator or technician will want to do the job right, and will want to make sure they didn't cause a problem.

BTW, here is the test procedure for P0327:

Test for P0327:

Circuit Description
The Control Module (PCM/VCM) uses the Knock Sensor(s) (KS) in order to detect engine detonation. Ignition Control (IC) spark timing is retarded based on the KS signal input when spark knock is detected. The Control Module monitors normal engine background noise during warm engine operation. If stores these noise values for comparison to the current knock sensor signal to help discriminate between normal engine noise and knock. If the amount of noise is below the minimum stored noise value, this DTC will set.

Conditions for Running the DTC

No active ECT sensor DTCs
No active TP sensor DTCs
The timing retard is 0°or less.
System voltage is between 10 and 17.1 volts
The ECT is greater than 60°C (140°F)
The engine run time is greater than 2 minutes
The Knock Sensor noise is less than 3 counts
The engine speed is between 2,000 and 3,000 RPM
The Throttle Position is greater than 6 percent

Conditions for Setting the DTC
The difference between the actual noise value and the learned minimum noise value is less than 50 counts or more than 200 counts.

Action Taken When the DTC Sets

The VCM illuminates the MIL during the second consecutive drive cycle in which the diagnostic reports a fail.
The VCM will set the DTC and records the operating conditions at the time the diagnostic fails. The VCM stores the failure information in the scan tools Freeze Frame and/or the Failure Records.

Conditions for Clearing the MIL/DTC

The Control Module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the Engine Coolant Temperature is more than 70°C (158°F) during the same ignition cycle).
Use the scan tool Clear Information function.

Diagnostic Aids
Check for the following conditions:

A misrouted harness. Inspect the knock sensor harness in order to ensure that it is not routed too close to high voltage wires such as spark plug leads.
Improper knock sensor torque specification. Torque the knock sensor to 19 N.m (14 lbs ft) . Refer to Fastener Notice in Service Precautions.

Review the Fail Records vehicle mileage since the diagnostic test last failed in order to help determine how often the conditions that caused the DTC to set occur. This may assist in diagnosing the condition.

An intermittent may be caused by any of the following conditions:

A poor connection
Rubbed through wire insulation
A broken wire inside the insulation



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