Chrysler New Yorker. Manual — part 689

TEST NS-7A

CHECKING THE IDLE AIR CONTROL MOTOR OPERATION

Perform TEST NS-2A Before Proceeding

NOTES

N

O

S

T

A
R

T

T

E
S

T

S

592

TEST NS-7A

CHECKING THE IDLE AIR CONTROL MOTOR OPERATION

Perform TEST NS-2A Before Proceeding

*Perform Verification TEST VER-1A.

**Check connectors - Clean / repair as necessary.

HOLD THE ENGINE

START TEST

THROTTLE 1/4 OF

DOES THE ENGINE

NO

PERFORM TEST

NS-7A. THE WAY DOWN.

START AND STAY NS-8A.

ATTEMPT TO START

RUNNING?

THE ENGINE.

YES

RELEASE THROTTLE INSPECT THROTTLE

DOES

THE THROTTLE

YES

CLEAN THROTTLE

AND TURN IGNITION

BODY FOR A COKING

BODY HAVE A COKING

BODY AS NEEDED.*

OFF. CONDITION.

CONDITION?

NO

WITH THE DRB,

DOES THE ENGINE

NO

PERFORM TEST

START ENGINE.

ACTUATE THE IAC

RPM RESPOND

TC-25A.*

WIGGLE TEST.

CORRECTLY?

YES

TEST COMPLETE.*

N

O

S

T

A
R

T

T

E
S

T

S

593

TEST NS-8A

REPAIRING A START AND STALL CONDITION

Perform TEST NS-7A Before Proceeding

NOTES

N

O

S

T

A
R

T

T

E
S

T

S

594

TEST NS-8A

REPAIRING A START AND STALL CONDITION

Perform TEST NS-7A Before Proceeding

At this point in the diagnostic test procedure, you have determined that all of the engine electrical
systems are operating as designed; therefore, they are not the cause of the start and stall
problem. The following additional items should be checked as possible mechanical causes of the
no start condition. Any one or more of these items can produce a no start condition; none can be
overlooked as a possible cause.

1. ENGINE VALVE TIMING - must be within specifications

2. ENGINE COMPRESSION - must be within specifications

3. ENGINE EXHAUST SYSTEM - must be free of any restrictions

4. ENGINE PCV SYSTEM - must flow freely

5. ENGINE DRIVE SPROCKETS OR TIMING BELTS - must be properly positioned

6. FUEL - must be free of contamination

7. ENGINE SECONDARY IGNITION CHECK - must exhibit a normal scope pattern

Always look for any Technical Service Bulletins that may relate to this condition.

N

O

S

T

A
R

T

T

E
S

T

S

595