In October 2004, Mitsubishi filed a statutory recall with Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) concerning the Blow-by system, covering the Pajero. The filing affects 57 vehicles manufactured between September 2000 and January 28, 2004.
Overview
| MLIT filing number | 1112830 |
|---|---|
| Type | Statutory Recall (government-mandated recall) |
| Date filed | October 28, 2004 |
| Manufacturer(s) | Mitsubishi |
| Component | Blow-by system |
| Production period | September 2000 — January 28, 2004 |
| Vehicles affected | 57 units |
Filing in context
The Blow-by system is the most frequently cited component category in this archive, appearing in 2 of its 4,890 filings. This filing is one of 150 Mitsubishi notifications from 2004 in this archive. For scale, 4,109 of the 4,890 filings in this archive report a larger number of affected vehicles; the vehicles involved here were manufactured over a span of about 3 years and 4 months.
Defect
On vehicles converted to operate on both gasoline and compressed natural gas (CNG), the low-pressure regulator that controls CNG pressure and flow contains a valve with excessively high rubber hardness and a valve seat machined to insufficient precision. As a result, the valve seal is inadequate and CNG leaks past it. During idling, the leaking CNG enriches the fuel mixture and causes rough engine operation. While the vehicle is parked, leaked CNG accumulates in the intake manifold; if the engine is restarted immediately after shutdown, a backfire may occur. In the worst case, the backfire can dislodge the intake blow-by hose, releasing blow-by gas into the atmosphere.
Corrective action
On all affected vehicles, replace the low-pressure regulator with the corrected part. Additionally, inspect the intake system; if damage is found, replace the damaged components with new parts.
Affected models & chassis ranges
This filing lists 1 type code(s). A vehicle is affected if its chassis number falls within one of the ranges below.
| Type code (型式) | Model | Chassis ranges |
|---|---|---|
| LA-V73W | PAJERO | V73W-0100141 — V73W-0401477 |
Original Japanese (MLIT source text)
Show the original Japanese filing text
状況
ガソリン燃料装置に圧縮天然ガス（ＣＮＧ）を併用で使用できるように改造した車両に おいて、ＣＮＧの圧力及び流量を制御する低圧レギュレータの内部にある弁のゴム硬度が 高く、また弁座の加工精度が悪いため、当該弁のシール性が不十分なものがある。そのた め、当該弁からＣＮＧが漏れ、アイドル運転中に燃料濃度が濃くなりエンジン回転不調と なる、または、駐車中に内部で漏れたＣＮＧが吸気管に滞留し、エンジン停止直後に再始 動を行うとバックファイアが発生することがあり、最悪の場合、ブローバイホースが抜け 、ブローバイガスが大気中に放出されるおそれがある。
改善措置
全車両、低圧レギュレータを対策品と交換する。なお、吸気系を点検し、損傷がある場合 は、損傷部品を新品と交換する。
Source & verification
This entry reproduces public data from Japan's MLIT recall registry. English text is jdmvin.com's own translation; always verify against the official source:
https://renrakuda.mlit.go.jp/renrakuda/ris-detail-car.html?class=recalldatacar&id=3000949
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Open recall detail →All Mitsubishi recalls · All 2004 recalls · Recall Archive home