Turbo - Pinging, Loss of Power, Stalling Fault Codes Set

9231saab01

CATEGORY
Engine


SECTION
2


PAGE
17


ISSUE
03/92-0192


CODE
291


Subject:
APC Solenoid Valve Hoses

Application:
Certain 1991 900 Turbo Models


Service Directive

On 1991 900 Turbo models within VIN range M7021000-M7022219, the rubber hoses connected to the APC solenoid valve may develop cracks. Affected hoses develop lengthwise cracks starting on the exterior and progressing inwards leading to a potential air leak. The fault symptoms vary depending on which hose cracks. New hoses have been introduced into production to eliminate future occurrences of cracking.


If the hose to the wastegate or compressor housing is cracked and an air leak exists, the boost pressure will increase if the engine is accelerating until the LH system cuts off the fuel supply at about 1.1 bar. This results in severe engine pinging and a subsequent momentary loss of power.


If the return hose cracks, the idle mixture will become too lean causing the engine to idle erratically and possibly stall. Additionally, fault codes will be generated in the LH system.


NOTE

This PSI is Identified as a "Service Directive," meaning that affected cars should be corrected before delivery if possible or at the next service opportunity, regardless of whether there has been a customer complaint. A "Service Directive" differs slightly from a "Campaign". Owners are not notified to bring their car in for unscheduled service under this procedure.


Parts Required

Hose P/N 93 42 619

Hose P/N 75 25 777

Hose P/N 75 10 266





Repair Procedure

1. Change all three solenoid valve hoses.

2. Erase any fault codes recorded in the LH system.


Warranty Information:

For warranty claims, use Failure Coding 29124-31-0-01-01. Labor Allowance is 0.3 hours which should be entered as straight time.