Engine - Rough Idle/Noise
Article No. 86-20-12IDLE ROUGH - NOISE ENGINE (4.9L)
LIGHT TRUCK 1977-84 F SERIES, BRONCO, ECONOLINE
A rough idle, occurring when there is a vacuum leak or an engine noise, may be caused by the following:
The EGR gasket may be deteriorated or the EGR spacer mounting flange may be warped. This will cause a vacuum leak and/or an exhaust noise at the EGR valve.
Check the EGR valve gasket/spacer area for a leak. If there is a leak, perform the following:
^ Remove the EGR valve and inspect the gasket. If the gasket is damaged, replace it with a new gasket (part number E5DZ-9D476-A).
^ Inspect the EGR spacer flange for flatness with a straight edge. If the flange is warped, replace the spacer with a new spacer (part number E4TZ- 9A589-H).
PART NUMBER PART NAME CLASS
E5DZ-9D476-A EGR Hanger Gasket B
E4TZ-9A589-H EGR Spacer Assembly* A
* Includes all necessary gaskets.
OTHER APPLICABLE ARTICLES: 86-9-18, 85-16-22
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: 9475A - Replacement of EGR gasket only
TIME: 0.4 Hr. - F Series, Bronco, Econoline
OPERATION: 9510A - Carburetor assembly remove and install
TIME: 0.5 Hr. - F Series, Bronco 0.7 Hr. - Econoline
OPERATION: 9510A2 - Replacement of carburetor to intake manifold spacer
TIME: 0.2 Hr. - F Series, Bronco, Econoline DLR. CODING: Basic Part No. 9D476 - Code: N4