Aftermarket Efi With Knock Sensor Manual Transmission Trans

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In the event that the ECU hears detonation it pulls timing and adds fuel until the detonation goes away but it does not generate a diagnostic trouble code.

Unfortunately the Z32 ECU does not listen for detonation at higher RPM, as it is not able to distinguish detonation from other engine noises.

The ECU is always looking for a resistance in the detonation sensor circuit of around 1 mega-ohm.

If this resistance is not present the ECU throws a code 34 and also goes into a self protection mode in which ECU switches to more conservative safety maps with less timing and more fuel as well as lowers the boost level on Twin Turbo models by opening solenoids that normally bleed off some of the pressure to the wastegate actuators.

The faulty part in the detonation sensor circuit is usually the sub-harness between the sensor itself and the EFI harness.

Corrosion on the terminals of the connector between the sub-harness and the detonation sensor is usually the cause of a code 34.

Z1 sells the detonation sensor sub-harness HERE, you can select to add one for a discounted price below.

It is difficult to change or even clean the connections on unless you have your engine apart.

It is possible to eliminate a code 34 by tricking the ECU into believing the circuit is OK.

You can attach a 1 mega-ohm resistor across the two terminals in the plug that attaches to the detonation sensor sub-harness on the main engine EFI wiring harness.

This will eliminate the Code 34 allowing your ECU to function as normal, but will eliminate the self protection function of the detonation sensor altogether.

These cheap aftermarket reproductions seem to be incapable of picking up the proper frequencies required to identify detonation.

OEM 300ZX (Z32) Plenum Gasket 7.93 Nissan 300ZX (Z32) Valve Cover Gasket Kit 52 Z1 One (Single) Piece Stainless Steel Clutch Line 49 Z1 300ZX Silicone Master Hose Set 308 Z1 Howe 300ZX Z32 TT Radiator 315 Z1 Motorsports EFI Engine Wiring Harness 300ZX 5 Speed Manual 1990-95 488.

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