Vehicle - Vibration When Idling

90ford36
^ IDLE - ROUGH - 2.2L EFI & TURBO WITH AUTOMATIC TRANSAXLE

^ NOISE - "WHINE" AT IDLE SPEED - 2.2L EFI & TURBO WITH AUTOMATIC TRANSAXLE

^ VIBRATION - FELT IN STEERING WHEEL AND DRIVER'S SEAT AT IDLE
Article No. 90-23-4
FORD: 1989-90 PROBE


This TSB article is being republished in its entirety to correct the material description of the engine mounts and lower radiator mounts. In addition, a step has been included to inspect the position of the upper radiator hose clamp tips.

ISSUE: A vibration felt in the steering wheel and driver's seat or a "whining" noise may occur when the engine idle speed is about 700 RPM. These conditions happen when the automatic transmission is in the "Drive" range and after the engine has warmed up. They are caused by the position and isolating qualities of the engine and lower radiator mounts.

ACTION: Make sure the idle speed is to specification. Install new lower radiator mounts and new number 1 & 2 engine mounts that are made from softer materials. Refer to the following procedure for service details.


1. Check to see that idle speed is within the specification.

^ Idle speed: 750 +/- 25 RPM in "P" range.

2. If the idle speed is not within specification, adjust it to 750 RPM with the test connector grounded. Refer to the 1990 Probe Shop Manual, pages 21-01-6/7 for 2.2L EFI service details and page 24-07-16 for 2.2L Turbo service procedures.

a. Adjust to the upper limit by turning the idle air screw counterclockwise to approximately 1000 RPM. The higher RPM will allow the ISC (Idle Speed Control) to control the RPM to be near 775.

b. Turn the engine off before disconnecting the STI (Self Test Input) ground wire.
c. Restart the engine and confirm that the ISC is controlling RPM to the upper limit.

3. Replace the radiator lower mounts with softer rubber ones. Refer to the 1990 Probe Shop Manual, page 27-03-02 for radiator service details.

4. Make sure the radiator is centered in the radiator upper brackets without friction so that the radiator can move freely as an effective dynamic damper. If not, adjust the radiator or brackets as follows:

Figure 1:

a. Adjust the position of the upper brackets so that radiator boss is centered, Figure 1.

b. Adjust the position of the radiator upper hose so that the radiator is not pushed or pulled out of position.

5. Check the A/C system for any interference or vibration causing factors.

Figure 2:

a. Make sure the air conditioning pipe from the compressor to the condenser is not interfering with the radiator, Figure 2. If necessary reposition the A/C pipe to attain enough clearance between the A/C pipe and radiator.

b. Make sure the cooling fan is not contributing to the idle vibration.
^ Turn the A/C system on.
^ Confirm that the compressor clutch and cooling fan are operating.
^ Inspect the cooling fan mounts for proper position and bolt torque.

6. Adjust the hood lock if a "rattling" noise comes from the hood. Refer to the 1989 Probe Shop Manual, page 44-08-01 for service details.

Figure 3:

7. Replace the Number 1 & 2 engine mounts with new ones, Figure 3.

Figure 4:

8. Remove and throw away the Number 2 silencer hangers and rubbers which are located in front of the presilencer, Figure 4. After removing the hangers from the body, put the bolts back to the body to prevent water from entering.

9. Inspect the upper radiator hose clamp tips. If the tips are straight up, rotate the clamp 90~ to the left.



OTHER APPLICABLE ARTICLES: None
SUPERSEDES: 90-21-6
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
902304A Install Radiator Mount & 1.2 Hrs.
Engine Mount
DEALER CODING
BASIC PART NO. CONDITION CODE
6068 67
OASIS CODES: 608000, 608400, 703000, 703100