1998 OPEL FRONTERA oil level

6E–275 ENGINE DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom
StepActionVa l u e ( s )Ye sNo
1DEFINITION:
Fuel economy, as measured by an actual road test, is
noticeably lower than expected. Also, economy is
noticeably lower than it was on this vehicle at one time,
as previously shown by an actual road test.
(Non-standard tires will cause odometer readings to be
incorrect, and that may cause fuel economy to appear
poor when it is actually normal.)
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
—Verify repairGo to Step 3
3Was a visual/physical check performed?
—Go to Step 4
Go to
Visual/Physic
al Check
4Check owner’s driving habits.
Is the A/C “ON” full time (defroster mode “ON”)?
Are tires at the correct pressure?
Are excessively heavy loads being carried?
Is acceleration too much, too often?
Was a problem found?
—Go to Step 5Go to Step 6
5Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?
—System OK—
61. Visually/physically check: Vacuum hoses for splits,
kinks, and improper connections and routing as
shown on the “Vehicle Emission Control
Information” label.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 7
71. Remove and check the air filter element for dirt or for
restrictions. Refer to
Air Intake System.
2. Replace the air filter element if necessary.
Was a repair required?
—Verify repairGo to Step 8
81. Remove spark plugs and check for wet plugs,
cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to
Spark Plug Replacement.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 9
91. Check for low engine coolant level. Refer to Engine
Cooling
.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 10

6E–303 ENGINE DRIVEABILITY AND EMISSIONS
4. Check the transfer case oil level. Add fluid if
necessary.
5. Connect the negative battery cable.
Air Cleaner/Air Filter
Removal Procedure
1. Loosen the clamp between the air cleaner lid and the
mass air flow sensor.
2. Release the four latches securing the lid to the air
cleaner housing.
3. Remove the air cleaner lid.
TS23973
4. Remove the air filter element.
TS23794
5. Remove the retaining bolts and the air cleaner
housing from the vehicle.
130RT002
Installation Procedure
1. Install the air cleaner housing in the vehicle with the
retaining bolts.
130RT002

6E–349 ENGINE DRIVEABILITY AND EMISSIONS
Damage during re-gapping can happen if the gapping
tool is pushed against the center electrode or the
insulator around it, causing the insulator to crack.
When re-gapping a spark plug, make the adjustment
by bending only the ground side terminal, keeping the
tool clear of other parts.
”Heat shock” breakage in the lower insulator tip
generally occurs during several engine operating
conditions (high speeds or heavy loading) and may be
caused by over-advanced timing or low grade fuels.
Heat shock refers to a rapid increase in the tip
temperature that causes the insulator material to
crack.
Spark plugs with less than the recommended amount of
service can sometimes be cleaned and re-gapped , then
returned to service. However, if there is any doubt about
the serviceability of a spark plug, replace it. Spark plugs
with cracked or broken insulators should always be
replaced.
A/C Clutch Diagnosis
A/C Clutch Circuit Operation
A 12-volt signal is supplied to the A/C request input of the
PCM when the A/C is selected through the A/C control
switch.
The A/C compressor clutch relay is controlled through the
PCM. This allows the PCM to modify the idle air control
position prior to the A/C clutch engagement for better idle
quality. If the engine operating conditions are within their
specified calibrated acceptable ranges, the PCM will
enable the A/C compressor relay. This is done by
providing a ground path for the A/C relay coil within the
PCM. When the A/C compressor relay is enabled,
battery voltage is supplied to the compressor clutch coil.
The PCM will enable the A/C compressor clutch
whenever the engine is running and the A/C has been
requested. The PCM will not enable the A/C compressor
clutch if any of the following conditions are met:
The throttle is greater than 90%.
The engine speed is greater than 6315 RPM.
The ECT is greater than 119C (246F).
The IAT is less than 5C (41F).
The throttle is more than 80% open.
A/C Clutch Circuit Purpose
The A/C compressor operation is controlled by the
powertrain control module (PCM) for the following
reasons:
It improvises idle quality during compressor clutch
engagement.
It improvises wide open throttle (WOT) performance.
It provides A/C compressor protection from operation
with incorrect refrigerant pressures.
The A/C electrical system consists of the following
components:
The A/C control head.
The A/C refrigerant pressure switches.
The A/C compressor clutch.
The A/C compressor clutch relay.
The PCM.
A/C Request Signal
This signal tells the PCM when the A/C mode is selected
at the A/C control head. The PCM uses this to adjust the
idle speed before turning on the A/C clutch. The A/C
compressor will be inoperative if this signal is not
available to the PCM.
Refer to
A/C Clutch Circuit Diagnosis for A/C wiring
diagrams and diagnosis for A/C electrical system.
General Description (Exhaust Gas
Recirculation (EGR) System)
EGR Purpose
The exhaust gas recirculation (EGR) system is use to
reduce emission levels of oxides of nitrogen (NOx). NOx
emission levels are caused by a high combustion
temperature. The EGR system lowers the NOx emission
levels by decreasing the combustion temperature.
057RW002
Linear EGR Valve
The main element of the system is the linear EGR valve.
The EGR valve feeds small amounts of exhaust gas back
into the combustion chamber. The fuel/air mixture will be
diluted and combustion temperatures reduced.
Linear EGR Control
The PCM monitors the EGR actual positron and adjusts
the pintle position accordingly. The uses information from
the following sensors to control the pintle position:
Engine coolant temperature (ECT) sensor.
Throttle position (TP) sensor.
Mass air flow (MAF) sensor.
Linear EGR Valve Operation and Results
of Incorrect Operation
The linear EGR valve is designed to accurately supply
EGR to the engine independent of intake manifold
vacuum. The valve controls EGR flow from the exhaust

6G–7 ENGINE LUBRICATION
Oil Pan and Crankcase
Removal
1. Disconnect battery ground cable.
2. Drain engine oil.
3. Lift vehicle by supporting the frame.
4. Remove front wheels.
5. Remove oil level dipstick from level gauge tube.
6. Remove stone guard.
7. Remove radiator under fan shroud.
8. Remove suspension cross member fixing bolts, 2 pcs
each per side and remove suspension cross member.
9. Remove pitman arm and relay lever assembly, using
the 5–8840–2005–0 remover, remove pitman arm
from the steering unit and remove four fixing bolts for
relay lever assembly.
10. Remove axle housing assembly four fixing bolts from
housing isolator side and mounting bolts from wheel
side. At this time support the axle with a garage jack
and remove axle housing assembly.
11. Remove oil pan fixing bolts.
12. Remove oil pan, using 5–8840–2153–0 sealer cutter,
remove oil pan.
013RS003
13. Remove crankcase fixing bolts.
14. Remove crankcase, using 5–8840–2153–0 sealer
cutter, remove crankcase.
NOTE: Do not deform or damage the flange of oil pan and
crankcase.
Replace the oil pan and/or crankcase if deformed or dam-
aged.
013RS003
Installation
1. Install crankcase.
1. Remove residual sealant, lubricant and moisture
from mounting surface, then dry thoroughly.
2. Properly apply a 4.5 mm (0.7 in) wide bead of
sealant (TB-1207C or equivalent) to mounting
surface of crankcase.
Sealant beat must be continuous.
The crankcase must be installed within 5
minutes after sealant application before the
sealant hardens.
013RW010

6G–9 ENGINE LUBRICATION
6. Install suspension cross member and tighten fixing
bolts to the specified torque.
Torque : 78 Nꞏm (8.0 Kgꞏm/58 lb ft)
013RW007
7. Install radiator under fan shroud.
8. Install stone guard.
9. Install engine oil level dipstick.
10. Fill engine oil until full level on engine oil gauge
dipstick.

6G–11 ENGINE LUBRICATION
4. Install oil filter assembly and tighten bolts to the
specified torque.
Torque : 25 Nꞏm (2.5 Kgꞏm/18 lb ft)
050RW001
Legend
(1) Oil Pump
(2) Oil Filter
(3) Oil Gallery
(4) From Oil Filter
(5) To Oil Filter
5. Install timing pulley on crankshaft.
Install timing belt.
Refer to installation procedure for Timing Belt in this
manual.
6. Install crankshaft pulley.
Refer to install procedure for Crankshaft Pulley in
this manual.
7. Install crankcase assembly.
Refer to installation procedure for Oil Pan and
Crankcase in this manual.
8. Refill engine oil until full level on engine oil dipstick.

6G–12
ENGINE LUBRICATION
Oil Pump Oil Seal
Removal
1. Disconnect battery ground cable.
2. Drain engine oil.
3. Remove crankshaft pulley.
Refer to removal procedure for Crankshaft Pulley in
this manual.
4. Remove timing belt.
Refer to removal procedure for Timing Belt in this
manual.
5. Remove timing pulley from crankshaft.
6. Remove oil pump oil seal using a sealer puller.
NOTE: Take care not to damage sealing surfaces of oil
pump and crankshaft when removing oil seal.
Installation
1. Install oil pump oil seal, apply engine oil to oil seal lip,
then install oil seal using 5–8840–2287–0 installer.
015RS001
2. Install timing pulley to crankshaft.
3. Install timing belt.
Refer to installation procedure for Timing Belt in this
manual.
4. Install crankshaft pulley.
Refer to installation procedure for Crankshaft
Pulley in this manual.
5. Refill engine oil until full level.

6G–13 ENGINE LUBRICATION
Oil Filter
Removal
1. Disconnect battery ground cable.
2. Drain engine oil.
3. Remove oil filter using 5-8840-0203-0 filter wrench.
Installation
1. Clean filter fitting surface and apply small amount of
engine oil to sealing surface.
2. Install oil filter cartridge by hand until it comes in
contact with sealing surface then rotate additional 2/3
turn to tighten using 5-8840-0203-0 filter wrench.
050RW001
Legend
(1) Oil Pump
(2) Oil Filter
(3) Oil Gallery
(4) From Filter
(5) To Filter
3. Fill engine oil until full level on dipstick.
4. Reconnect battery ground cable.