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TSB 18-016-05

Throttle Body Coking

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Date: April 12, 2005  

Models: 2004 (DR) Ram Truck

2004 (DR) Ram Truck
2004 (HB) Durango

NOTE: This bulletin applies to vehicles equipped with a 5.7L engine (sales code EZA).

NOTE: This condition is rarely experienced on vehicles with less than 50,000 miles.

Overview:
This bulletin involves cleaning the throttle body.

Symptom/Condition:
The vehicle operator may describe MIL illumination.
The technician may find one or more of the following DTC’s:

Diagnosis:
Using a Scan Tool (DRBIII or StarSCANT) with the appropriate Diagnostic Procedures, verify
all engine systems are functioning as designed. If DTCs are present, other than those listed
above, record them on the repair order and repair as necessary before proceeding further with
this bulletin.

Inspect the air induction system including the air filter element, resonator, air induction hoses
and throttle body, for restriction and/or large accumulations of silty deposits on air flow
surfaces.

If accumulation of silty deposits are present in the throttle body and /or behind the throttle
plate, perform the appropriate Repair Procedure.

Parts Required:
Qty. Part No. Description
1 04897150AB or 04897151AB Brake Parts Cleaner
AR NPN Clean Soft Shop Towel

Repair Procedure: 

1.      Remove the throttle body from the intake manifold. Refer to the service information
available in TechCONNECT or the Ram Truck service manual (publication no.
81-370-04059), Section 14 Fuel Injection, Throttle Body, Removal, page 14-36.
CAUTION: Use only Mopar Brake Parts Cleaner, p/n 04897150AB or 04897151AB, as
the use of other cleaners may damage components of the throttle body.
Use this cleaner only in a well ventilated area. Do not let this cleaner come
in contact with the skin. Rubber or butyl gloves are recommended. Wash
thoroughly after use. Avoid eye contact. Avoid ingesting.
2. While holding the throttle open, spray the throttle body bore with Mopar Brake Parts
Cleaner, p/n 04897150AB or 04897151AB. Spray the entire throttle body bore and the
manifold side of the throttle plate.
3. Use a soft cloth to help break loose deposits to clean the throttle body bore and throttle
plate. While holding the throttle open, clean both the top and bottom of the throttle body
bore. Also clean the manifold side and edges of the throttle plate.
NOTE: Take due care not to scratch, bend, or dent throttle plate and/or throttle body
bore.
NOTE: It is important this cleaning operation be performed thoroughly and completely.
The edge of the throttle plate and the portion of the throttle body bore that is in
the closest proximity to the closed throttle plate is the most critical area where
the cleaning should be concentrated. This area must be free of all deposits
when the cleaning is completed.
4. Spray the throttle body with, Mopar Brake Parts Cleaner, p/n 04897150AB or
04897151AB, and then blow dry with compressed shop air. Inspect for any foreign
material which may have been left behind during the cleaning process.
CAUTION: Do not apply shop air pressure directly into the throttle shaft and throttle
body housing holes.
5. Open and close the throttle plate on the throttle body to verify that there is no increased
effort when moving from the closed position. If the condition is corrected, proceed to the
next step. If the increased effort still exists, then some other condition exists with the
throttle body and further diagnosis and repair will be necessary and will not be covered
by this repair procedure.
6. Install the throttle body on the intake manifold.
7. Open and close the throttle to verify that there is no increased effort when moving from
the closed throttle position. If the condition is corrected, proceed to the next step. If the
increased effort still exists, then some other condition exists with the throttle linkage and
further diagnosis and repair will be necessary.

Policy:    Reimbursable within the provisions of the warranty.

Time Allowance:

Labor Operation No:   Description Amount
14-30-01-91 Clean Throttle Body 0.3 Hrs.

Failure Code:

RO        Driveability

I would like to thank Bob Bergevin, Arthur Cantrall, Barry Drodge, David Lovell, Bill Maurits, and Steve for supplying the information for these bulletins. And a big thank you goes to Geno's Garage for making DodgeRam.info possible.
 

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This page was edited on: May 3, 2004