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#Post#: 201--------------------------------------------------
General Motors Pickup Trucks
By: forbitals Date: January 24, 2022, 4:27 pm
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General Motors Full-Size Trucks 1980-87 Repair Manual
Gasoline and Diesel
Chilton's, An American Tradition Since 1925
The smog control gear on the vehicles of this era are extremely
complicated. I think it got easier when they went to sequential
fuel injection and everything behing handled through the
computer. But to understand where it all came from, the extreme
complexity, is why I picked up the book. So let me go straight
to the emission controls section.
Positive Crankcase Ventilation
to evacuate the crankcase of vapors
PCV valve meters the air flow rate, to maintain idle quality.
Valve sits in grommet in top of left valve cover.
Crankcase breather hose goes from right side valve cover to air
filter housing. Has its own little filter. In some "abnormal"
situations it would send crankcase vapors back up and into the
intake.
Air Injector Reactor (A.I.R.)
the smog pump. Injects air near the exhaust valve. Has
diverter valve, check valve, and its own filter
Pulse Air Injection (PAIR)
exhaust gas pulses siphon fresh air into the exhausts. Has check
valves. Mostly on I6 engines.
Thermostatic Air Cleaner (Thermac) on all gasoline engines.
Uses damper controlled by vacuum motor. Preheats cold inlet
air.
Evaporative Emission Control System (EECS) about 3 vacuum
control valves. Must use special EVAP rubber tubing.
Early Fuel Evaporation (EFE) valve on flange of exhaust
manifold. For heat rising. Uses Thermal Vacuum Switch (TVS)
which has 3 vacuum control lines
Throttle Return Control (TRC) tries to interdict supper rich
mixture you get when you quickly take your foot of the gas and
let the throttle close. This slows it down.
Oxygen Sensor, must never be expose to silicone, can't use
silicone sealants on exhaust or intake manifolds. Do not touch
sensor. If it looks white, it is trashed. Do not modify pig
tail connector, do not solder other stuff to it. Might have to
have exhaust manifold heated to 120 deg F to unscrew. Don't use
regular anti-sieze, because that insulates it. Use special GM
anti-seize for O2 sensors.
Catalytic Converter, gets super hot. Install with suitable
sealants. (ceramic?)
Trapped Vacuum Spark, prevents drop in vacuum to distributor
advance when cold. Uses Thermal Vaccum Switch (TVS)
Exhaust Gas Recirculation (EGR), feeds back a small amount of
exhaust gas. Seems to have special mid throat port on
carburetor. Purpose is to diffuse peak ignition temperature to
prevent oxides of nitrogen from being formed. Sometimes use ECM
(Electronic Control Module)
Electronic Spark Timing (EST) System (California or fuel
injected only)
Explains diagnostic codes
Goes into diesel engine
Diesel has vacuum pump
Huge set of vacuum diagrams
Uses Rochester Carburetors
Might have to install grease gun nipples. Use special grease
for power assisted steering, not the same as chassis ball
joints. Don't over fill ball joints so they screw up rubber
booties.
For manual transmission and rear axle use 80w 90 GL5. For
automatic use Dextron. For power steering use special GM fluid
or Dextron II.
Has two tie rod adjustments. But you can get steering wheel of
with puller. Can adjust camber (roofer's square on smooth flat
concrete floor best ) Can adjust castor
Shows two Delco Alternators with internal voltage regulators.
These are better than the old two wire externals. On Chrysler
the Drain Charge Ammeter was iconic. But because of better
voltage regulation, and it gets even better, those ammeters are
hard to buy now. Volt meter is sufficient.
One of the Delcos is 3 phase delta, and the other is 3 phase Y.
One has in addition a module of 3 exciter diodes. The other
does not. There is always a wire for the dashboard warning
light. On the one with the exciter diodes it back feeds to keep
the light off. The other has some internal box to which a
schematic is not supplied.
Open front wheel bearings you need to grease.
They say to replace inboard side grease seal every time.
They show cross torque lug nut patterns for 5, 6, and 8 studs.
SJG
Stanley Clarke
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Buddy Guy, Knock on Wood
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Norah Jones, Something
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While My Guitar Gently Weeps
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THE ROLLING STONES - Hand Of Fate (1976) w/ Billy Preston in
Paris
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Jumpin' Jack Flash, Paris 1976
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Honky Tonk Woman
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Only Rock 'n' Roll
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Tumblin' Dice
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The Rolling Stones - Tumbling Dice - Oakland 1994 w/ early Lisa
Fischer
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