Cuts Out/Misses

Steady pulsation or jerking that follows engine speed, usually more pronounced as engine load increases. The exhaust has a steady spitting sound at idle or low speed.



SYSTEM OR COMPONENT TO CHECK ACTION




IGNITION CHECK CYLINDER MISS:
CAUTION Do NOT perform this test
for more than 2 minutes,
as this may cause damage to the
catalytic converter.
- Start engine, allow engine to warm-up.
- Shut off engine, disconnect IAC motor.
- Restart engine and remove one
spark plug wire at a time
using insulated pliers.
- If there is an rpm drop, on all cylinders,
(equal to within 50 rpm).Rough, Unstable, or Incorrect Idle, Stalling - Reconnect IAC motor with ignition "OFF."
- If there is no rpm drop on one or more
cylinders, or an excessive variation in drop,
check for spark on the suspected cylinder(s)
with J 26792 (ST-125). Spark Tester or equivalent.
-If there is spark, remove spark plug(s)
in these cylinders and check for:
- Insulation Cracks
- Wear
- Improper Gap
- Burned Electrodes
- Heavy Deposits
- SPARK PLUG WIRES Resistance should not
exceed 30,000 ohms, also check rotor
and distributor cap.
NOTE If the previous checks did not find the problem:
- Visually inspect ignition
system for moisture, dust,
cracks, burns, etc.
- With engine running spray plug
wires with fine water mist to check
for shorts.