EXPERTEC TSB (94-T-13)

Publication date: 1994-04-07
Reference number: 94-T-13

EXPERTEC TSB

TECHNICAL SERVICE BULLETIN

Reference Number(s): 94-T-13, Date of Issue: April 7, 1994

MIL (SES LAMP) ON, ENGINE RUNS ROUGH/STALLS AT IDLE

Model(s): 1991-94 Saturns with SOHC (LKO) Engine equipped with Plastic TBI Tube Module Assembly

Bulletin No.: 94-T-13

Date: April 7, 1994

CONDITION

The malfunction indicator lamp (MIL) (SERVICE ENGINE SOON telltale lamp) may be On, engine may run rough and/or engine may stall at idle. PCM diagnostic trouble codes 45 and/or 49 may also be present.

CAUSE

The gasket on the plastic TBI tube module on the TBI assembly and/or the connectors of the vacuum harnesses from the vacuum tube module to the MAP sensor, EGR solenoid/valve and the EVAP canister purge solenoid may be damaged, producing a vacuum leak.

CORRECTION

Inspect the gasket of the plastic TBI tube module and vacuum harness connectors according to the procedure in this bulletin. See Fig 1 .

PROCEDURE

Remove vacuum source harness assemblies, connecting the TBI tube module to the EVAP canister purge and EGR solenoids, EGR valve and MAP sensor, from the TBI tube module.
Remove the vacuum source harness assembly from the MAP sensor and the vacuum source harness assembly from the EGR valve and EVAP canister purge solenoid.
Inspect the vacuum source harness assemblies for any deterioration or splitting. If either of the vacuum source harness assemblies show signs of deterioration or splitting, replace with a new vacuum source harness assembly, using the appropriate part number given under PARTS REQUIREMENTS .
If the vacuum source harness assemblies do not show signs of deterioration or splitting, remove the two bolts securing the TBI tube module to the throttle body assembly.
Remove the TBI tube module and inspect the gasket for deterioration and/or splitting.
If the gasket shows signs of deterioration or splitting, replace the TBI tube module kit with a new metal TBI tube module kit (P/N 21007009).
NOTE: The new metal TBI tube module kit requires a paper gasket, which is included with the TBI tube module kit (P/N 21007009).
If the gasket of the plastic TBI tube module does not show signs of deterioration or splitting, refer to diagnostic trouble code charts in the "Electronic Engine Controls Service Manual" for the diagnostic trouble code(s) set. If no diagnostic trouble code is set, refer to the "Cause-Complaint-Condition" charts in the "Engine Mechanical Service Manual."

PARTS REQUIREMENTS

21007009 TBI Tube Module Kit (Metal)
21006243 Harness Asm-Vac Sce (MAP)
21000843 Harness Asm-Vac Sce (EGR/EVAP)

Fig 1: Areas To Inspect

CLAIM INFORMATION

To receive credit for this repair, submit a claim through the Saturn Dealer System as follows:

Labor Operation No.: J6980 Vacuum Hose - Repair or Replace

Labor Time: 0.4 Hour

Case Type: VW