Sensor or device.
Items in RED are critical in starting the engine.
|Location (typical) 89-95.
||Air temp, or Intake Air
Temperature sensor. IAT
intake tube or the intake
manifold plenum, not critical , it fine tunes!
|| Engine Coolant
Temperature senso ECT
to water jacket on block or water outlet of thermostat housing.
||Manifold Absolute Pressure. Critical after Starting. MAP
to intake manifold plenum. Vacuum sensor, electronic.
Position Sensor TPS
end of the Throttle Body butterfly shaft. A Variable
||Exhaust oxygen sensor O2S ( HGEO = heated )
in exhaust manifold (on old cars), new cars have 2
||Vehicle Speed sensor. VSS
a rotation counter on the speedo cable. Cars speed is measured.
|| CAM angle
in the old Distributor or on Cam shaft end , on newer cars.
|| Crank position
(96 an newer)
front of oil pan and reluctor wheel behing crank belt cog wheel.
Recirculation devices EGR
on Intake manifold and is not a sensor (but is,on somecars )
||Maintenance Indicated Lamp ,Check Engine Light||On
dash Lamp shared with SES.
Service engine soon.
||Power train control
module PCM EFI
is behind left front speaker. aka:ECU,ECA,ECC, BRAIN or Puter
||MASS Air Flow, Sensor MAF
on Air tube
between Throttle body and the Air cleaner. 95 and newer vehicles and
all 16valve engines. NEVER touch the HOT WIRE!
||Idle speed Controller (a output
valve. Electric modulated Idle control device.
||Idle Air Control IAC usually a thermo device
||Located on base of Throttle body
"TB" both MPI and TBI
||Starter monitor, Battery
|| Multi Point Injection and
Throttle body Injection.
|| 16v is MPI and 8v engines
are TBI . Vastly different EFI designs.
|| Large black charcoal
canister and vacuum control purge valves.
||Torque Converter Clutch
|| varies by year, some PCM's
(newer) have no relay ,ECU has direct drive.
module, 4speed only
||located high in dash above right
knee behind ignition key level.
THE DUMMY SPARK PLUG: (get one)
This is the best kind (IMHO) but, there are many more good types.
To test for spark , you should have a dummy spark plug connected (see above photo).
Never short out any spark plug top terminal to ground directly or leave it open circuited.
You MAY damage the ignitor device.[ a huge transistor ] or in newer cars the ECU will be blown out. ( integrated Ignitor). < best reason to not do it!
( the ignitor, is part of a High Energy Ignition, that which generates up to 50,000 volts, to spark the plugs )
The above is Sold in all Automobile parts stores. It is dirt cheap. Some guys just weld a clip to a new spark plug.
RESPECT: ( this is high voltage and can be dangerous , unlike a lawn mower engine with 5 times less power)
50,000 volts, don't touch it while cranking or running the engine.
It will be very painful! Even dangerous if it passes through your heart !