High Idle, Stall: Vacuum Control Modulator (VCM) (NIS0032AP)

Publication date: 1970-01-01
Reference number: NIS0032AP

HIGH IDLE, STALL: VACUUM CONTROL MODULATOR (VCM)

TECHNICAL INFORMATION TIP

Reference Number(s): NIS0032AP, Date of Issue:

HIGH IDLE, STALL - VACUUM CONTROL MODULATOR (VCM)

YEAR(S): 1984-87

MANUFACTURER: Nissan

MODEL(S): Sentra

ISSUE & TIP

A poor vacuum signal at the vacuum control modulator (VCM) on 1984-87 Nissan Sentras will cause stalling, a high idle, and no fast idle when cold. To find the cause of the poor vacuum signal:

Check the length of hose that runs from the intake manifold to the VCM for breakage or collapse.
Check the vacuum source for this hose. Because of its location near the EGR valve. This vacuum tee may become clogged with carbon deposits.
Clean out the vacuum tee if it is clogged, then recheck the vacuum source with a vacuum gauge. You should read manifold vacuum at the tee and at the VCM inlet port.

Courtesy of Import Service Magazine

with thanks to:

Dwayne Albright

Lamoreaux Mobil

Kingston, New York

REFERENCE NUMBER

NIS0032AP

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