Range Rover County LWB (LH) V8-4.2L (1993)
Diagnostic Plug: All Technical Service Bulletins
Engine - Misfire/Stumble Under Load
04/03/94
12/01/94/US
SUBJECT:
V8i Petrol Engine - Misfire/Stumble
MODEL:
Range Rover Defender
AFFECTED VEHICLES:
All V81 Petrol derivatives
DETAIL
A number of reports have been received which detail engine misfire/stumble condition under load. Investigation by Land Rover engineers has found that
the pins in the female side of the diagnostic connector can open up resulting in a poor contact. The inadequate contact results in a poor/intermittant
ground path at the connector, which will cause a misfire or stumble condition.
To overcome this condition the connector pins require resetting and cleaning. To prevent reoccurrence a cable tie wrap is placed around the male and
female halves of the connector to secure them firmly together.
ACTION REQUIRED
Upon customer complaint follow the procedure below.
PARTS INFORMATION
ASU 1421 Cable tie 290 mm long or similar.
Cleaner/deoxidizer part number
LRNA 2000400
Lithium grease Part number
LRNA 201325
PROCEDURE
Range Rover - Diagnostic plug located under right hand front seat adjacent to the ECU.
Defender - Diagnostic plug located in the right hand footwell behind the fascia lower trim panel.
1)
Disconnect the diagnostic plug.
2)
Inspect the female side of the connector and close down the female pins to original profile and spray with the cleaner/deoxidizer.
3)
Connect and disconnect the diagnostic plug 3 to 4 times to ensure a good contact.