Montero 4WD L4-2555cc 2.6L SOHC (1984)
Deceleration Valve: Customer Interest
Engine - Idle Surge, No-Start or Stall
SUBJECT:
FBC ENGINE IDLE/SURGE CONDITION - (DSV)
NO.
STB-84-14-006
DATE February 1984
1984 2.0L Cordia/Tredia MODEL 1984 California Montero
INTRODUCTION
Symptoms of road-load surge, no-start or no-idle below 1500 rpm on 1984 Feedback Carburetor (FBC) equipped 2.0L Cordia/Tredia models or
California Montero models may be traceable to an open circuit in the Deceleration Solenoid Valve (DSV) on the carburetor.
FIGURE 1 - LOCATION OF DSV AND ESV
FIGURE 2 - LOCATION OF JSV
LOCATION OF THE DSV
The DSV is a normally-closed valve that is held open by electrical current. It is screwed into the carburetor below the dashpot (Figure 1) and may be
identified by its blue and red leads. There are two other identical looking valves on the carburetor - one is the Enrichment Solenoid (ESV) (Figure 1),
and the other is the Jet Solenoid Valve (JSV) (Figure 2). These two valves differ internally from the DSV, and the three are not interchangeable.
TROUBLESHOOTING DIAGNOSIS
When an open circuit occurs in the DSV, the valve closes, cutting off the idle fuel supply. The result of this is:
1.
Engine won't idle below about 1500 rpm.
2.
The engine may not start.
3.
A surge may be noted at road load. If any of these symptoms appear, check the DSV for an open circuit.
FIGURE 3 - TEST FOR DSV OPEN CIRCUIT
