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Service bulletin 6321

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id606801
Published by NHTSA2000-11-08
Manufacturer's number6321
Manufacturer's date1999-06-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:GASOLINE

NHTSA's summary

SOME VEHICLES MAY EXHIBIT SPARK KNOCK UNDER ACCELERATION. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
FORD RANGER1998, 1999

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
19990611999-04-15. Engine

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
CSP-08B012008-10-24. Service bulletin. FORD: CERTAIN 1999-2001 MODEL YEAR VEHICLES UP TO 6000 LB GVWR REGISTERED IN NEW YORK AND CERTAIN 2001 VEHICLES UP TO 6000 LB GVWR REGISTERED IN THE STATE OF MAINE, CERTIFIED FOR SALE IN CALIFORNIA-FEDERAL EMISSION WARRANTY REFUND. *PE
022212004-07-27. Service bulletin. ENGINE-GEAR DRIVEN SYNCHRONIZERS-INCORRECT INSTALLATION-CAMSHAFT POSITION SYNCHRONIZER (CMP) INSTALLATION TOOL CORRECT APPLICATION. *MJ
8701972003-03-25. Service bulletin. INCORRECTLY INSTALLED GEAR DRIVEN CAMSHAFT POSITION (CMP) SENSOR SYNCHRONIZER ASSEMBLIES CAUSING SURGE, LOST OF POWER, MALFUNCTION INDICATOR LAMP ON AND DIAGNOSTIC TROUBLE CODES P1336, P1309 AND P0340. *TT
161002002-11-05. Service bulletin. SOME VEHICLES EQUIPPED WITH A 3.0L GASOLINE ENGINE MAY EXHIBIT AN ENGINE QUIT UPON INITIAL STARTING OF THE ENGINE WITH A NORMAL RESTART AND RUN ON THE SUBSEQUENT ATTEMPT. *TT
154552002-04-18. Service bulletin. SOME VEHICLES EQUIPPED WITH A 2.5/3.0L ENGINE MAY EXHIBIT A SURGE, HESITATION, ROUGH IDLE OR MALFUNCTION INDICATOR LAMP ILLUMINATED WITH DIAGNOSTIC TROUBLE CODES P0171, P0174, P0175. *TT
012462002-04-18. Service bulletin. ENGINE OIL SYSTEM PRIMING PROCEDURES, SERVICE TIPS FOR REPORTS OF PREMATURE ENGINE FAILURE. *TT
012052002-02-26. Service bulletin. SOME VEHICLES MAY EXHIBIT VACUUM OR AIR LEAKS IN THE INTAKE MANIFOLD AND / OR ENGINE SYSTEM CAUSING DIAGNOSTIC TROUBLE CODES P0171 AND OR P0174. *TT
011972002-02-22. Service bulletin. SOME VEHICLES EQUIPPED WITH THE 4.0L OHV ENGINE MAY EXHIBIT AN ENGINE NOISE WHICH MAY BE PERCEIVED BY THE CUSTOMER AS A PISTON / ONNECTING ROD BEARING KNOCK. *TT
152262001-12-03. Service bulletin. SOME VEHICLES EQUIPPED WITH A 4.0L OHV ENGINE MAY EXHIBIT AN ENGINE NOISE THAT MAY BE PERCEIVED BY THE CUSTOMER A S ADIESEL TYPE NOISE AND IS KNOWN AS MARBLE NOISE. *TT
151902001-11-16. Service bulletin. SOME VEHICLES MAY EXHIBIT SURGE, HESITATION, ROUGH IDLE OR MALFUNCTION NDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODES P0171, P0172, NP0174, P0175. *ET