QuestionI have a 1500 with a 5.9 that has had a spark knock for some time I have tried better fuels no drastic change. I have found out that the timing is non adjustable (prior to attempting adjustment)does this system use a knock sensor if so could this be the problem? Also is there any factory publications on this with a correction?
AnswerTHIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-05-00 REV E,
DATED SEPTEMBER 01, 2000, WHICH SHOULD BE REMOVED FROM YOUR FILES.
ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE AN
EMISSIONS PACKAGE UPDATE TO THE TABLE.
SUBJECT:
1998 Model Year Engine Spark Knock
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM) with new software (calibration level 98Cal12 and 98Cal12C)
MODELS:
1998 (AB) Ram Van
1998 (AN) Dakota
1998 (BR/BE) Ram Truck
1998 (DN) Durango
1998 (XJ) Cherokee
NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A GASOLINE
ENGINE. SEE THE TABLE BELOW FOR SPECIFIC APPLICATION.
VEHICLE ENGINE TRANSMISSION EMISSIONS CD RELEASE
AB 3.9L / 5.2L A3 / A4 Fed and Calif Use 2064
AB 5.9L A4 Federal Only Use 2064
AN 2.5L / 3.9L A4 / M5 Fed and Calif Use 2064
**AN** 5.2L A4 / M5 Fed and Calif Use 2067
BR/BE 3.9L / 5.2L A4 / M5 Fed and Calif Use 2064
BR/BE 5.9L A4 Federal Only Use 2064
BR/BE 5.9L M5 Fed and Calif Use 2064
DN 5.2L / 5.9L A4 Fed and Calif Use 2064
XJ 4.0L A4 Fed and Calif Use 2064
Legend: A3 = 3 spd auto A4 = 4 spd auto M5 = 5 spd manual
SYMPTOM/CONDITION:
Some vehicle engines may exhibit a light-to-moderate spark knock condition during
acceleration (under load).
