Engine - Idle Roll/Surge Condition

87ford5

^ IDLE ROLL - 2.9L EFI - IMPROPER HARD STOP SETTING Article No.
87-9-9
^ SURGE - 2.9L EFI - IMPROPER HARD STOP SETTING


MERKUR: 1988 SCORPIO

ISSUE: Some Merkur Scorpio vehicles may exhibit an idle roll/surge condition. This may be caused by improperly set throttle plates, (base idle).


ACTION: Customer complaint vehicles should be serviced using the following procedure.

1. Check to make sure that all engine electrical system connectors are tight and the vacuum lines are in good condition.

2. Check that there are no manifold vacuum leaks.

3. Continue with this procedure only if service code "11" is present during self-test and ignition timing has been set correctly.

4. Set the EATC in the ECON position.

5. Place the transmission in NEUTRAL (manual transmission) or PARK (automatic transmission) and make sure parking brake is fully applied.

6. Warm engine to normal operating temperature and turn off.

7. Disconnect the idle speed control valve electrical connection.

8. Start engine and operate at 2000 RPM for about 30 seconds by manually operating the throttle linkage.

9. Allow the engine to return to idle slowly and check base idle using an accurate tachometer.

10. Remove the tamper-proof cap from the throttle stop screw and discard. Loosen the throttle stop screw lock nut.

Figure 6:

11. Loosen the throttle cam plate roller bolt prior to adjusting the throttle stop screw, Figure 6.

12. Set engine speed to 700 +/- 25 RPM by adjusting throttle plate stop screw on throttle body. Retighten the lock nut on the throttle stop screw.


13. Retighten throttle camplate roller bolt making sure that throttle stop still contacts the throttle stop screw and when the throttle is opened, the throttle camplate contacts the roller without excessive throttle pedal "lost motion".

14. Increase engine speed to 2000 RPM for about 30 seconds. Repeat this one more time to make sure throttle plates are free.

15. Turn off engine and connect idle speed control valve connector.

16. Check to make sure the throttle plate is not stuck in bores by moving throttle plates.

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870909A
TIME: 0.4 Hr.
DLR. CODING: Basic Part No. 9F715 - Code: 09