fuel consumption TOYOTA CELICA 1987 Service Repair Manual

EM-6 ENGINE MECHANICAL - Troubleshooting
Problem
:- Excessive oil
consumption
Poor fuel economy
Unpleasant odor -.
TROUBLESHOOTING (Cont’d) ._
Possible cause
Oil leak
PCV line clogged
Piston rings worn or damaged
Valve stem and guide worn
Valve stem seal worn
Fuel leak
Air cleaner clogged
Incorrect ignition timing
EFI system problems
l Injector faulty
0 Deceleration fuel cut system faulty
Idle speed too high
Spark plugs faulty
EGR system always on
Low compression
Tires improperly inflated
Clutch slips
Brakes drag
Incorrect idle speed
Incorrect ignition timing
‘Vacuum leaks
0 PCV hoses
0 (w/ EGR)
EGR valve ’
0 Intake manifold
l Air intake chamber
l Throttle body
EFI system problems Remedy
Repair as necessary
Check PCV system
Check rings
Check valves
Check seals ~’
Repair as necessary
Check air cleaner
Reset timing
Repair as necessary
Check ISC system
Inspect plugs
Check EGR system
Check compression
Inflate tires to proper pressun
Troubleshoot clutch
Troubleshoot brakes
Check ISC system
Reset timing
Repair as necessary
Repair as necessary Page
EM-65
EM-37
EM-37
EM-7
EM-l 7
FI-108
IG-7
M-26, 2’
FI-108
EM-l 7

TURBOCHARGER SYSTEM - Troubleshooting TC-5
TROUBLESHdOTlNG
NOTE: Before troubleshooting the turbocharger, first
check the engine itself. (Valve clearance, engine compres-
sion, ignition timing etc.)
INSUFFICIENT ACCELERATION, LACK OF POWEk OR
EXCESSIVE FUEL CONSUMPTION
(Possible Cause)
I
1. TURBOCHARGING PRESSURE TOO
LOW
t
’ (Check Procedure and Correction Method)
Check turbocharging pressure. (See page TC-8)
Turbocharging pressure:
M/T 0.39 - 0.53 kg/cm2
(5.5 - 7.5 psi, 38 - S2 kPa)
A/T 0.34 - 0.42 kg/cm2
(4.8 - 6.0 psi, 33 - 41 kPa)
If the pressure is below specification, begin
diagnosis from item 2.
2. RESTRICTED INTAKE AIR SYSTEM Check intake air system, and repair or replace
‘1
parts as necessary. (See page TC-7)
J
.
3. LEAK IN INTAKE AIR Check intake air system, and repair or replace
parts as necessary. (See page TC-7)
.
4. RESTRICTED EXHAUST SYSTEM Check exhaust system, and repair or replace parts
as necessary. (See page TC-7)
Check exhaust system, and repair or replace parts
as necessary. (See page TC-7)
6. ERRATIC TURBOCHARGER
OPERATION Check rotation of impeller wheel. If it does not turn
or turns with a heavy drag, replace the turbocharger
assembly.
Check axial play of bearing shaft. (See page TC- 14)
Axial play: 0.13 mm (0.0051 in.) or less
If not within specification, replace the turbocharger
assembly.

TCG6’ TURBOCHARGER SYSTEM +yTroubleshooting’
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(Possible Cause)
.(Check Procedure and Correction Method)
1. TURBOCHARGERINSULATOR
’ Check for loose, improperly installed or deformed 7 .
RESONANCE
_. .._.
L insulator mount bolts and nuts, and repair or replace
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3. EXHAUST PIPE LEAKING OR I ._ /
Check -for-etibaustpipe deformation, loose mount
VIBRATING
--/ bolts or a damaged .gasket, and repair or replace as
necessary, ,.. .* / ,, .: ‘.
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3. ERRATIC TURBOCHARGER c
3
OPERATION Refer to ite’m :6 of.@SUFFICIENT ACCELERATION,
LACK, QF POW&R OF El’kCiSSIVE FUEL :
>
> CONSUMPTION
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EXCESSIVE OIL COhlSUMPTION OR WHITE EXHAUST i
(Possible Cause)
L FAULTY TURBOCHARGER OIL SEAL
I- Chedk fd’~o’il le;~~~~~ ‘~~‘“ir~~a~~t ~~sti?iri,.
l Remove the turbine el’bow from the turbocharger
and., check for .excessive carbon depdsjts .on the
.,..we - -..... _, .,., ll.~ I~ . . . . . _.~__” ..- ).,/.. ,,a,.*“, ,‘*<*\. ,..
turbine wheel~~~~~~~~.sl~~~~ar,~o,~;:.depqsits would
.indicate ,a--faultyturbocharger.-‘~, .’
Check for oil leakage in intake air system.
l Check for axial...play,.io.imp.eller.wheel, and replace
thb’ turboch@$~$ iflng&$ja#y +: ___ :’
ISee pagk.‘TC”.T$j+=“*~ . . *. .._- _. __
Axial play: 0.13 mm 40.0051 in.) or less
C&JTIONf~ ~~~~.~~~,“~~~~~~~;hl~.diagirose ordinary
._ . 3 .*a p9 i e&f & ? c ” .
oil, mist from. tha.)?C~Y~.ln~.tti~~,~~ow by gaS as an oil
leak from the turbocharger.