1991 - 2002 All Saturn S-Series vehicles
Due to addition of 1997-2002 model years to Models Affected and new Parts Requirement, this bulletin supercedes bulletin 95-T-36, which should be discarded.
Some customers may comment about objectionable engine vibration at idle. This condition may be more noticeable when the engine reaches normal operating temperature.
Objectionable engine vibration at idle may be caused by one or more of the following conditions:
Refer to procedures to diagnose and repair any condition that could cause objectionable engine vibration at idle.
Some level of engine vibration is normal during initial engine warm-up. Engine idle vibration quality should be evaluated only when the engine reaches operating temperature and when the engine maintains a stable RPM. Before evaluating engine idle vibration quality, road test the vehicle and verify that the condition is present with the engine at operating temperature. Using a scan tool, make sure the engine's ignition and fuel systems are functioning properly. If the engine is not running properly, repair as needed.
Vibrations are normally felt in the steering wheel, lower seat cushion, seat back, or floor pan. Vibrations should be diagnosed with the vehicle stopped and the transaxle in Drive ("D") for automatic transaxles and in Neutral for manual transaxles.
Inspect the vehicle to see if current top engine mount is a first or second design mount. Refer to the following illustrations to determine which procedure to follow.
The First Design Engine Mount measurement procedure can be used to measure both
first and second design engine mounts. The Second Design Engine Mount measurement
procedure can only be used for the second design mounts.Important
First Design Engine Mount
Using two 150 mm (6 in.) scales or a 150 mm (6 in.) scale and a suitable straight edge, measure engine mount assembly as shown in the First Design Mount illustration.
Second Design Engine Mount
Measure gap in mount at location shown in the Second Design Mount illustration. A 2 mm (5/64 in.) allen wrench or hex key can be used as a go/no go gauge for this measurement.
Check the lower cooling module grommets located in the pockets of the cradle. If the cooling module grommets are 1st design, P/N 21030708, replace with new 2nd design, P/N 21031313. The second generation cooling module mounts were introduced during the 2002 model year production.
Check upper cooling module grommets for binding, misalignment, and freedom of movement. Cooling module retaining pins must be centered in grommets for support by upper radiator brackets, and cooling module should move from left to right, forward and rearward freely a minimum of 3.18 mm (1/8 in.). If grommets are pinched, loosen upper radiator bracket(s) and reposition them. Make sure locator tang in each upper radiator bracket is properly positioned in upper tie bar slot.
Check the powertrain for binding by pushing forward and rearward on the engine oil pan. The powertrain should travel a minimum of 3.18 mm (1/8 in.).
If the powertrain does not move, perform the following procedure:
Make sure the engine strut bracket does not move forward or rearward when torquing
the two fasteners.Important
Tighten the engine strut bracket-to-cradle fasteners to 50 N·m (37 lb-ft).
If the specified muffler movement cannot be obtained, carefully lower the exhaust
system and adjust the muffler hanger using washers or replace the muffler isolator
block as needed. Washers with an inside diameter of 9.53 mm (3/8 in.)
may have to be installed on the attachment bolt(s) between the muffler block bolt
and the frame rail to align the muffler hanger parallel with the muffler.Important
Make sure the system has not shifted rearward allowing contact between the hanger
bracket bolt and the hanger block (1). Ensure a 19 mm (3/4 in.)
clearance between the muffler and the muffler ramp (2).Important
If equipped with A/C, make sure A/C suction line does not contact transaxle.
Part Number | Description |
|---|---|
21031313* | MOUNT-RAD LWR |
(Supercedes P/N 21030708) | |
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System using the appropriate Electronic Labor Time Guide for the correct Labor Operation Code and Time.
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GM bulletins are intended for use by professional technicians,
NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to
provide information that could assist in the proper service of a
vehicle. Properly trained technicians have the equipment,
tools, safety instructions, and know-how to do a job properly and
safely. If a condition is described, DO NOT assume that the
bulletin applies to your vehicle, or that your vehicle will have
that condition. See your GM dealer for information on whether
your vehicle may benefit from the information. |
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