1987 knock sensor location?
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The knock sensor is just in front of the starter just above the oil pan rail. It will be behind a heat shield.
Properly adjusted roller rockers and good lifters should not really cause any problems.
Properly adjusted roller rockers and good lifters should not really cause any problems.
Thread Starter
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Joined: Jun 2009
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From: Victoria Harbour
At least it will tell me if it is interfering with the set-up.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Disconnecting the knock sensor will set a Code 43 and can result in sluggish performance. It won't really have any effect in trying to test for noise in the valvetrain.
The whole premise behind this system is to have the sensor detect "knock" and pass the signal onto the Electronic Spark Control module which is the square relay just to the outside of the heater fan motor. The ESC will then shut off voltage to the ECM which results in timing being retarded. This happens above 850 RPM or so.
You will really need a scan tool to do troubleshooting. There will be displays on the scan tool to tell if the sensor is really detecing a noise. There is also a display to show how much spark retard (timing) is being done by the ECM.
The whole premise behind this system is to have the sensor detect "knock" and pass the signal onto the Electronic Spark Control module which is the square relay just to the outside of the heater fan motor. The ESC will then shut off voltage to the ECM which results in timing being retarded. This happens above 850 RPM or so.
You will really need a scan tool to do troubleshooting. There will be displays on the scan tool to tell if the sensor is really detecing a noise. There is also a display to show how much spark retard (timing) is being done by the ECM.
