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EC- -8
3--Way
Plug
To Intake
Manifold
A
(1)
EMISSION CONTROL
Low Vacuum
Port Q
A01737
Disconnect
A01738
A
B
B
Z15471
(3)
(2)
(4)
A01739
- -
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
(2RZ- -FE)
(b)
If you have no hand--held tester, check these procedures:
(1)
Remove the 3--way connector with the vacuum
hose.
(2)
Connect the vacuum hose (from port Q of EGR vac-
uum modulator) to the EGR valve.
(3)
Plug the vacuum hose (from VSV for EGR).
(c)
Check that the vacuum gauge indicates low vacuum at
3,000 rpm.
7 .
DI S CO NNE CT HAND - - HE LD TE S T E R.
8 .
RE MO V E VACUUM G AUG E
Remove the vacuum gauge, and reconnect the vacuum hoses
to the proper locations.
9.
INSPECT EGR VALVE
(a)
Apply vacuum directly to the EGR valve with the engine
idling.
(b)
Check that the engine runs rough or dies.
(c)
Reconnect the vacuum hoses to the proper locations.
IF NO PROBLE M IS FOUND WITH THIS
INSPECTION, SYSTEM IS NORMAL; OTHERWISE INSPECT
E ACH PART
10.
REMOVE EGR PIPE
Remove the bolt, 4 nuts, EGR pipe and 2 gaskets.
HINT:
At the time of assembly, please refer to the following items.
Install the EGR pipe with a 2 new gaskets.
Torque:
Bolt: 18 N.m (185 kgf∙cm, 13 ft∙lbf)
Nut A: 19 N.m (195 kgf∙cm, 14 ft∙lbf)
Nut B: 20 N.m (200 kgf∙cm, 15 ft∙lbf)
11 .
REMOVE EGR VALVE
(a)
Disconnect these hoses:
(1)
Vacuum hose
(2)
EGR hose
(3)
Water bypass hose (from ISC valve)
(4)
Water bypass hose (from water bypass pipe)
(b)
Remove the 2 nuts, EGR valve and gasket.
Torque: 19 N.m (195 kgf∙cm, 14 ft∙lbf)
3RZ-F,3RZ-FE
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Do you have a question about the 1RZ and is the answer not in the manual?
Questions and answers
1rz engine can't pick up fast and sounds as if not enough fuel reaching the engine
A Toyota 1RZ engine with slow acceleration and symptoms of insufficient fuel may have issues related to the fuel injection system, ignition system, or air intake. Possible causes include:
1. Fuel Injection Issues – Clogged or malfunctioning fuel injectors can reduce the amount of fuel delivered to the engine, leading to poor acceleration.
2. Fuel Pressure Problems – A weak or failing fuel pump, clogged fuel filter, or faulty fuel pressure regulator can restrict fuel flow.
3. Ignition System Faults – A weak spark due to worn spark plugs, faulty ignition coils, or incorrect ignition timing can affect combustion efficiency.
4. Airflow Restrictions – A dirty or clogged air filter or a malfunctioning throttle body can limit the amount of air entering the engine.
5. Sensor Malfunctions – A faulty mass airflow sensor (MAF), throttle position sensor (TPS), or engine coolant temperature sensor can send incorrect signals to the ECU, affecting fuel delivery and timing.
6. Starter Signal Circuit Issues – If the starter signal is not properly received by the ECU, it may affect the fuel injection control, leading to poor performance.
7. Knock Sensor Issues – A malfunctioning knock sensor or related wiring problems could cause the ECU to retard ignition timing, reducing power.
A proper diagnostic check using an electrical tester and oscilloscope can help identify the exact fault.
This answer is automatically generated
Engine not having full combustion, loss of power and blackening plugs
A Toyota engine with part number 1RZ experiencing incomplete combustion, loss of power, and blackened spark plugs could be caused by the following issues:
1. Ignition Problems – Faulty ignition coil, igniter, or spark plugs can lead to weak or no spark, causing incomplete combustion. (Referenced in DI--151, IG--1)
2. Injector Circuit Malfunction – A faulty injector or injector circuit may cause excessive fuel delivery, leading to rich fuel mixture and blackened spark plugs. (Referenced in DI--158)
3. Airflow Meter Circuit Issues – A malfunctioning airflow meter can provide incorrect air intake readings, leading to an improper air-fuel mixture. (Referenced in DI--94)
4. Fuel Pump Control Circuit Fault – A malfunction here can result in incorrect fuel pressure, affecting combustion efficiency. (Referenced in DI--174)
5. Variable Resistor Circuit Malfunction – If applicable, this can affect sensor inputs to the ECU, leading to improper fuel delivery. (Referenced in DI--183)
6. Engine ECU Malfunction – A faulty ECU can cause incorrect fuel injection timing and mixture. (Referenced in DI--170)
These issues can lead to an overly rich fuel mixture, causing blackened spark plugs, reduced power, and inefficient combustion.
This answer is automatically generated
Location of the fog fuse relay on the box