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Old 08-07-2011, 12:21 PM
judd watkins judd watkins is offline
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Default Detonation /timing ?

I have a 96 Ford Ranger 3.0 . While driving my engine rattles possibly detonation . I tried a better grade of fuel seemed to help , but didn't stop it completely . I believe this could be a timing issue . what is the correct static timing for my engine and the correct procedure to check timing ? do I use a conventional tinming light . What device does the computer use to alter timing while running? I am not familuar with newer automobile engines with computer controlled timing ? I appreciate any knowledge in this area .I have plenty of experience with pre computer settups . Thanks in advance
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Old 08-12-2011, 09:19 PM
Cdy291 Cdy291 is offline
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Default Re: Detonation /timing ?

There is no distributor to adjust, the 94+ models use a coil pack. It all computer controlled and you would need to buy a tuner to adjust it.

Having said that though thats not what your problem is. These 3.0 engines are well known to have this problem. I have heard all kinds of reasons and was to solve it. It is said the combustion chamber is poorly designed, and not all of the gas gets burned which leaves carbon build up on the walls. The carbon build up is whats causing the pre detonation. It ignites just before the gas does. It could also be that if you put in a tank of 89 octane in it every now and then it would help to burn of all that carbon build up off the walls, but thats just a theory of mine.
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2001 Ranger Edge
3.0 V6
Automatic
4.10 gears
97,780 mi
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Old 08-13-2011, 10:34 PM
Cdy291 Cdy291 is offline
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Default Re: Detonation /timing ?

Here is what ford has to say about it with the old 4.0 engine, but it should all apply to the 3.0.


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)


Here is some more.
__________________
2001 Ranger Edge
3.0 V6
Automatic
4.10 gears
97,780 mi
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