Emission - Sulphur Odor From Exhaust
83toyota3 EMISSIONREFERENCE: CONTROL
NUMBER: 001
DATE: 2-18-83
MODEL: ALL
TITLE SULPHUR ODOR FROM EXHAUST EMISSION
Toyota cars are designed to be clean running and free from unpleasant odor. However, some odor may be unpreventable during limited driving conditions such as:
- Cold Start (10/15 minutes for normalization)
- After hill climbing
- Trailer towing
- At idle after high speed driving
If unpleasant odor is occurring during normal driving conditions other than described above, inspect the following items.
1. 22R Engines (Ref. Celica Repair Manual 36050 or 36150)
1. Check engine idle
^ Idle rpm
^ Ignition timing
2. Check air injection system and all vacuum hoses (visual check).
3. Check idle CO
^ The CO meter should indicate less than 3% at tail pipe with A.I. off.*
* Note: (1) Disconnect the vacuum hose between the ASV and vacuum pipe at the ASV side, and plug the hose end.
(2) Check that compressed air comes out of the air bypass hose at idle.
^ If CO is not below 3%, adjust carburetor air/fuel mixture by LEAN DROP METHOD. (See Repair Manual - Engine Adjustment Section, Idle Mixture Adjustment Procedures)
If excess odor is not remedied, check and adjust individual component according to the following procedures.
I.A. Air Injection System
^ Check for feedback function. Disconnect bypass hose at air cleaner from ACV and check the following functions with engine at normal operating temperature:
- At idle - pulsating
- At 2500 rpm - pulsating 8 times/10 seconds or more
If it does not function as indicated above, proceed with the following steps:
- Check operation of thermo switch No. 1. If air is injected into the exhaust port when the connector of the thermo switch No. 1 is disconnected, perform inspection of the thermo switch No. 1 according to the repair manual (p. 3-71)*.
- Check operation of TWC thermo sensor. If air is injected into the exhaust port when the connector to TWC thermo sensor is disconnected, perform inspection of the TWC thermo sensor according to the repair manual (p. 3-72).
I.B. Fuel System
^ Check operation of carburetor choke system (p. 3-89).
^ Check operation of AAP system (p. 3-94).
I.C. Others
^ Check condition of air cleaner element (p. 2-41).
^ Check operation of HAI system (p. 2-29).
^ Check operation of PCV valve (p. 3-42).
* NOTE: The numbers in brackets ( ) are the pertinent pages for each system in 1981 MY Celica Repair Manual.
11. 5M-E, 5M-GE Engines (See appropriate 5M-E or 5M-GE Engine Repair Manual)
1. Check engine idle
^ Idle rpm
^ Ignition timing
2. Check all emission control system vacuum hoses, especially pressure regulator, EGR, and spark control systems.
3. Check feedback system with EFI Checker.
^ Perform troubleshooting of EFI electronic circuit by oxygen sensor signal as indicated in repair manual. (Example: Repair Manual No. 36145: 5M-GE, p. F1-34)
4. However, if excess odor is accompanied by symptoms of rough idle or poor acceleration, proceed with the troubleshooting diagnosis on the next page.