Fuel Injectors - Long Crank Time to Start
89chrysler18Models
1983-1990 S/AS Body, 1988-1990 C/AC Body, 1989-90 AA-Body and 1990 AG and AJ Bodies With 3.0L Engine
Subject
Long Crank Time Before Starting Leaking Fuel Injectors
Index
DRIVEABILITY
Date
December 22, 1989
No.
18-11-89
REVISION A
(C18-29-9)
P-4406
BODY CODE LEGEND
AA - SPIRIT/ACCLAIM/LEBARON LANDAU
C/AC - DYNASTY/NEW YORKER LANDAU/SALON
AG - DAYTONA
AJ - LEBARON (COUPE/CONVERTIBLE)
S/AS - CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-11-89, Dated 8/21/89, WHICH SHOULD BE REMOVED FROM YOUR FILES.
SYMPTOM/CONDITION
As vehicle mileage accumulates, the owner may notice that the vehicle has longer crank time (3 seconds or longer) before starting. This could occur after either cold or hot soak periods. If the customer complaint is long crank time, use the following procedure. Do not use any other diagnostic tests.
PARTS REQUIRED
2 Plenum Gaskets PN MD094128
1 EGR Gasket (for '87 & '88) PN MD103625
1 Vacuum Tee (1/4 x 1/4 x 1/4) PN 4306994*
1 Vacuum Connector (1/4 x 1/4) PN 4201275*
*NOTE: THESE COMPONENTS ARE REUSABLE AND CAN BE USED FOR
TESTING OF SUBSEQUENT VEHICLES. THE EXACT VACUUM TEE AND VACUUM CONNECTOR MUST BE USED FOR THIS TEST. THE USE OF OTHER SIZE TEES OR CONNECTORS WILL RESULT IN INVALID TEST RESULTS. ALL OTHER EQUIPMENT MUST BE USED AS SPECIFIED.
REPAIR PROCEDURE
This procedure outlines the diagnosis of leaking fuel injectors, which may cause long crank time before starting.
1. Start and run engine until it reaches operating temperature. Wait until radiator fan cycles twice, then turn off engine. This procedure must be performed while the engine is at normal operating temperature.
2. Remove shop exhaust hose from tailpipe, if it was connected during engine warm-up.
3. Remove air inlet duct to the throttle body. Remove throttle linkage. On 1987 and 1988 vehicles, remove the EGR tube attached to the intake plenum. Remove top of intake plenum.
4. Using compressed air, blow out the intake manifold runners for EXACTLY FIVE (5) SECONDS EACH.
5. Remove coil ignition cable from distributor cap and attach to a good ground.
6. Use the DRB II to actuate fuel pump to pressurize the fuel system (for 1987 and 1988 vehicles use ATM mode 01 "coil spark," and for 1989 and 1990 vehicles use ATM "ignition coil"). Keep ATM activated for one minute (MUST BE EXACTLY ONE MINUTE) then exit ATM.
7. Obtain a 5-foot long section of 1/4" I.D. rubber hose (MUST BE EXACTLY 5 FEET OF 1/4" I.D. HOSE) to be used as an air sample line connected to a hydrocarbon exhaust gas analyzer. Make sure that the exhaust gas analyzer has a clean filter and is calibrated before performing this test.
FIGURE 1:
8. Install vacuum connector (PN 4201275) in the sample line at the end to be inserted into the intake manifold runner. Install vacuum tee (PN 4306994) at EXACTLY the middle of the sample line so that fresh air will be drawn in (see Figure 1).
FIGURE 2:
9. Wait for EXACTLY FIVE (5) MINUTES after exiting ATM, and then, one by one, insert the sample line approximately 5-6" down into each intake manifold runner (MARK THE HOSE WITH A PIECE OF TAPE SO THAT THE HOSE IS INSERTED EXACTLY THE SAME DISTANCE INTO EACH RUNNER). Record the peak HC (hydrocarbon) reading for each intake runner, being sure to let the analyzer reset to zero (0) before taking the next reading.
NOTE: THE INTAIKE MANIFOLD IS A CROSSOVER DESIGN. THEREFORE, TO TAKE READINGS FOR CYLINDERS 2, 4, AND 6 (WHICH ARE NEAREST THE FRONT OF THE VEHICLE), THE REAR MANIFOID RUNNERS MUST BE CHECKED (FIGURE 2).
10. After taking the readings from each intake runner, replace that cylinder's fuel injector only if HC readings are 100 ppm or greater.
11. Reinstall intake manifold plenum and torque bolts to 13 N-m (115 in.lbs.). On 1987 and 1988 vehicles, reinstall EGR tube to intake plenum and torque to 22 N-m (200 in.lbs.)
12. Reinstall the throttle cables and air inlet duct.
13. Reinstall coil ignition cable to distributor cap.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE: EFFECTIVE JANUARY 1, 1990
Labor Operation No. 14-30-20-68 . . . . . . . . . . . 0.3 Hrs.
(Injector Infra-Red Test)
14-30-20-23 . . . . . . . . . . . 0.9 Hrs.
(Replace 1 to 3 Injectors)
14-30-20-24 . . . . . . . . . . . 1.1 Hrs.
(Replace 4 to 6 Injectors)
FAILURE CODE: 43 - Fuel Leaks