Safari Van AWD V6-262 4.3L VIN W CPI (1992)
Fuel Injector: Customer Interest
Fuel - No Start, Hard Start, or Rough Idle After Start
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-01-022
Date: January, 2000
TECHNICAL
Subject:
No Start, Hard Start, or Rough Idle After Start (Clean CPI Poppet Valves)
Models:
1992-95 Chevrolet and GMC M/L, S/T Models
1992-95 Oldsmobile Bravada with 4.3 L Engine (VIN W - RPO L35)
Condition
Some customers may comment on no start, hard start, rough idle after start, surge, or other driveability concerns related to the fuel system (clean CPI
Poppet nozzles).
Cause
Under certain conditions, fuel elements may deposit on the poppet balls, seats, or pintles, which can cause the poppet balls to stick in either an open or
closed position.
Correction
Follow the Strategy-Based diagnostics for your customer's specific driveability concern. If diagnosis leads to sticking poppet nozzles, this cleaning
procedure should be performed prior to replacement of the CPI injector.
CPI Injector Cleaning Procedure
1.
Loosen the fuel filler cap to relieve vapor pressure in the fuel tank.
2.
Raise the vehicle on a hoist.
3.
Locate the underbody fuel line (1) junction point:
^
For S/T and L-van, it is along the left frame rail at approximately mid-vehicle.
^
For M-van, it is behind the left-front wheel housing.
Caution:
Considerable fuel leakage may occur. Make sure that protective eyewear is worn, and that suitable fuel containment measures are taken.
4.
Loosen and disconnect both the pressure and return lines at their junction points. The fittings towards the front of the vehicle (both pressure and
