1994 ford ranger 4.0l 5speed


Asked by Sep 13, 2016 at 08:43 PM

Question type: Maintenance & Repair

Hi I've got a 1994 ford ranger 4.0l 5speed.
Here's the problem I'm having it goes
down the road awesome but when you tac
it up "get more out of each gear" to gain
speed faster there's this clatter I here on
the right side up front somewhere. And it
gets louder the harder you hit the gas but
here's the kicker, when I put high grade
super fuel in and that's all you have in
there doesn't clatter abit, So I changed the
spark plugs thinking they where bad and
misfiring. They where old but they didn't
change anything. So I'm thinking now
could it be something with the fuel
system? Like fuel injectors or filter maybe
the fuel pump. The gas gauge doesn't
work maybe the fuel pump isn't right idk.
So what do you guys think about this.

1 Answer


Engine - Carbon Knock On Acceleration Article No: 01-19-7 10/01/01 ^ ENGINE - 4.0L OHV - CARBON KNOCK ON ACCELERATION ^ NOISE - CARBON KNOCK ON ACCELERATION - VEHICLES EQUIPPED WITH 4.0L OHV ENGINE ONLY FORD: 1990-1997 AEROSTAR 1990-2000 EXPLORER, RANGER ISSUE Some vehicles equipped with the 4.0L OHV engine may exhibit an engine noise which may be perceived by the customer as a piston/connecting rod bearing knock. This carbon knock is heard only under load during the drive cycle. Carbon knock is a customer drive duty-cycle phenomenon that cannot be repaired with an engine exchange. This may be caused by carbon build-up within the combustion chamber. ACTION Verify condition. If normal diagnostics fail to correct the condition, de-carbon the combustion chamber to help quiet the carbon knock noise. Refer to the following Service Procedure for details. SERVICE PROCEDURE 1. Use Motorcraft Carburetor Tune-up Cleaner PM-3. 2. Carbon removal: a. Disconnect canister purge line from throttle body. b. Attach a vacuum line to the canister purge port. c. At hot engine idle, allow the engine to ingest 1/2 to 2/3 of a can of Motorcraft Carburetor Tune-up Cleaner. Use caution not to ingest too quickly due to potential hydro-lock issues. d Shut engine off and allow it to soak for one hour. e. Start engine, allow engine to ingest the remainder of the Motorcraft Carburetor Tune-up Gleaner. f. Remove vacuum line and re-install canister purge line. g. Road test vehicle at 3500 RPM for 2-3 miles. h. Repeat above procedure two times for a total of three times. i. Change oil and filter. 3. Review the customers' driving habits. The recommended drive cycle should include daily periods of engine operation above 3,000 RPM, such as a brisk acceleration from a stop position. This will break/burn the carbon off the piston head. 4. Use regular unleaded fuel, 87 Octane. Mid-grade and Premium fuels may increase the probability of carbon buildup, leading to a knock noise. PARTS BLOCK OTHER APPLICABLE ARTICLES: NONE WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage OPERATION DESCRIPTION TIME 011907A Remove Carbon From 1.6 Hrs. Combustion Chamber (Includes Time To Perform Procedure A Total Of Three Times) DEALER CODING CONDITION BASIC PART NO. CODE 6108 42 OASIS CODES: 497000, 615000, 702000, 702100

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