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mndave0002, engineer
Category: Dodge
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Experience:  Design engineer and toolmaker mechanic previous ASE mech and ICARE body man
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how do i replace a purge valve on my 1997 dodge ram ...

Resolved Question:

how do i replace a purge valve on my 1997 dodge ram 1500 4x4 with a 5.9 ltr (360c.i.) motor?
Submitted: 9 years ago.
Category: Dodge
Expert:  mndave0002 replied 9 years ago.

Welcome to


All 3.9L/5.2L/5.9L/8.0L gasoline powered engines

use a duty cycle EVAP canister purge solenoid. The

solenoid regulates the rate of vapor flow from the

EVAP canister to the throttle body. The Powertrain

Control Module (PCM) operates the solenoid.

During the cold start warm-up period and the hot

start time delay, the PCM does not energize the sole-noid.

When de-energized, no vapors are purged. The

PCM de-energizes the solenoid during open loop oper-ation.

The engine enters closed loop operation after it

reaches a specified temperature and the time delay

ends. During closed loop operation, the PCM ener-gizes

and de-energizes the solenoid 5 or 10 times per

second, depending upon operating conditions. The

PCM varies the vapor flow rate by changing solenoid

pulse width. Pulse width is the amount of time the

solenoid energizes. The PCM adjusts solenoid pulse

width based on engine operating condition.


The duty cycle solenoid is attached to a bracket

mounted to the right inner fender (Fig. 2).

(1) Disconnect electrical wiring connector at sole-noid

(Fig. 2).

(2) Disconnect vacuum harness at solenoid.

(3) Remove solenoid from support bracket.


(1) Install solenoid assembly to support bracket.

(2) Connect vacuum harness.

(3) Connect wiring connector.



The evaporation control system prevents the emis-sion

of fuel tank vapors into the atmosphere. When

fuel evaporates in the fuel tank, the vapors pass

through vent hoses or tubes into the two charcoal

filled evaporative canisters. The canisters tempo-rarily

hold the vapors. The Powertrain Control Mod-ule

(PCM) allows intake manifold vacuum to draw

vapors into the combustion chambers during certain

operating conditions.

All 3.9L/5.2L/5.9L/8.0L gasoline powered engines

use a duty cycle purge system. The PCM controls

vapor flow by operating the duty cycle EVAP purge

solenoid. Refer to Duty Cycle EVAP Canister Purge

Solenoid for additional information.

When equipped with certain emissions packages, a

Leak Detection Pump (LDP) will be used as part of

the evaporative system. This pump is used as part of

OBD II requirements. Refer to Leak Detection Pump

in this group for additional information.

NOTE: The hoses used in this system are specially

manufactured. If replacement becomes necessary, it

is important to use only fuel resistant hose.



DESCRIPTION N·m Ft. Lbs. In. Lbs.

EVAP Canister Mounting Nuts 9n-m (newton-meters) 80 in/lb (inch/pounds)

Leak Detection Pump Mounting Screws 1n-m 11in/lb

Leak Detection Pump Filter Mounting


7n-m 65in/lb htis did not come out real well let me know if you need it typed better

Hope this helps

If this helps click accept thanks again David

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