Jim Grant's Tech Tips
'97 Dodge Dakota, Spark Knock
I have a '97 Dodge Dakota with a 3.9 L engine. Ever since I bought it
new, it has had the ping from pre-ignition. When I run mid grade it diminishes
but it's always there. I've had the program (computer) flashed, cleaned
the injectors, retorqued the manifold bolts, replaced the PCV and breather,
cleaned the throttle plate. On the analyzer it doesn't show any faults...
Could the TPS need replacing?
No, I could not say
that replacing the Throttle Position Sensor (TPS) on your vehicle would
correct a spark knock. But are you aware that with a factory scan tool
for Chrysler vehicles, you can go into the program and initiate a program
to change the spark timing? This is not to be confused with flashing (reprogramming
with new software) the computer. In the operating software for Dodge ,
Plymouth and Chrysler vehicles there is a way to alter the spark advance/retard
schedule of the ignition system. This module of the software allows for
a finer level of engine tuning. I would suggest investigating this procedure
to possibly correct your spark knock problem.