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Mike Kelly
Mike Kelly, Auto Mechanic
Category: Car
Satisfied Customers: 5325
Experience:  17 years experience as a auto mechanic,foreign and domestic.5 years running my own repair business.
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My truck will run fine and then it starts skipping and bucking,It

Resolved Question:

My truck will run fine and then it starts skipping and bucking,It has new wires and plug, new fuel pump. My mechanic had the truck for 4 days and drove it around but it didn't skip or buck
Submitted: 1 year ago.
Category: Car
Expert:  Mike Kelly replied 1 year ago.
Hi,how are you?Is the check engine light coming on at all?
Customer: replied 1 year ago.

once in a great while, but not often

Expert:  Mike Kelly replied 1 year ago.
Ok,has the codes ever been read ,if so do you know what they were?
Customer: replied 1 year ago.

all the electrical checked out ok, he even pulled a wire to make sure it was worked and it showed the cylinder was not firing.For some reason the code reader would not work

Expert:  Mike Kelly replied 1 year ago.
Ok,do you have the 3.0 engine?
Customer: replied 1 year ago.

V-6 smaller one I believe it a 3.0

Expert:  Mike Kelly replied 1 year ago.
Ok,there is a TSB/TECHNICAL SERVICE BULLITEN ON THIS ISSUE,THE STEPS OF THIS TSB WILL NEED A DEALER SCAN TOOL.



TSB
05-22-12 BUCK/JERK AND MISS DURING DRIVE CYCLE ABOVE 3000 RPM - NO
DTC - 3.0L 2V GAS AND FFV ENGINE


Publication Date: October 25, 2005

FORD: 2000-2003 Taurus,
Ranger 2000-2003 B3000
MERCURY: 2000-2003 Sable


ISSUE:
Some 2000-2003 Taurus,
Sable, Ranger,B-3000 vehicles equipped with a 3.0L 2-valve gas or FFV engine may
exhibit a buck/jerk/miss during drive cycles above 3000 RPM with no diagnostic
trouble codes (DTC's). A possible cause is the camshaft synchronizer assembly.
Since the camshaft position (CMP) fault monitor is not active above 2500 RPM, no
diagnostic trouble code (P0340) is set during the drive concern, thus making it
difficult to diagnose the root cause component.

ACTION:
Use an NGS to
identify whether or not the synchronizer is the causal component. Refer to the
following Service Procedure.

SERVICE PROCEDURE

Select PID
database.
Select "Fuel Priority" PID database.
Select KS1 and RPM PID's.

Capture data during drive symptom.
Using graph mode, display KS1 and
RPM.
Look for knock errors which can be identified by rapidly rising peaks
which correlate with drops in RPM (Figure 1).
If the synchronizer assembly
needs to be replaced, follow the appropriate model year Workshop Manual, Section 303-14, Electronic Engine Controls, Camshaft
Synchronizer - 3.0L (2V) Removal and Installation procedure.

PART NUMBER
PART NAME
F8DZ-12A362-AA Synchronizer Assembly



Figure 1 -
Article 05-22-12


ADDITIONAL TIPS

The KNOCK
sensor PID does not use a specific unit (although the
NGS displays a "V" after the numeric, it does not denote volts), the value
displayed is strictly a number used to determine knock status by the strategy.
Typically, the number will be between 25 and 125 with no fault or knock detected
across the RPM range.

When the synchronizer fault occurs, the knock will
increase rapidly, in most cases to its limit of 1023, but depending on the
severity of the event, can range from the low hundreds to the 1023 limit. The
key to identifying the synchronizer issue is the knock PID near or reaching the
1023 limit. In most cases of engine miss, detonation, etc. the knock will
increase, but not reach 1023. Also note, if the CMP
sensor is disconnected (open circuit fault), the knock
PID is not updated and the value of the PID will be set to the 1023
limit.


WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
And Emissions Warranty Coverage

OPERATION DESCRIPTION TIME
052212A
2000-2003 Ranger 3.0L MFI: Perform Diagnostics As Stated In Service Procedure,
Then Replace The Synchronizer Assembly (Do Not Use With 12362P, 12650D,
12650D81, 12650D60) 1.2 Hrs.
052212B 2000-2003 Taurus, Sable 3.0L MFI:
Perform Diagnostics As Stated In Service Procedure, Then Replace The
Synchronizer Assembly (Do Not Use With 12362P, 12650D, 12650D81, 12650D60) 1.4
Hrs.

DEALER CODING
BASIC PART NO. CONDITION CODE
12A362 42
Mike Kelly, Auto Mechanic
Category: Car
Satisfied Customers: 5325
Experience: 17 years experience as a auto mechanic,foreign and domestic.5 years running my own repair business.
Mike Kelly and 4 other Car Specialists are ready to help you

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Mike Kelly
Mike Kelly
Auto Mechanic
5325 Satisfied Customers
17 years experience as a auto mechanic,foreign and domestic.5 years running my own repair business.