The Car Care Clinic with the Dr John

97 Dodge Dakota - Ping from pre-ignition

Mike from Gravesend

Question

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 petrol it diminishes but it's always there. I've had the programme (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?

Answer

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 the computer in other words (reprogramming with new software)

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.

Good Luck!
Dr. John