02 SIII AU Running problems

[iwannaford]

Hi Ladies and Gentlemen. I don't know what else to search for, I cannot find what I am looking for with the Terms that I am using. So, I've decided to write to you all and ask for your valued assistance with my problem.

As it says in the Title, I have an 02 AU SIII SR Falcon, on Friday, I replaced my battery with a brand new better quality battery. The terminals were off the battery for about 10 minutes. I then cleaned both terminals, the hold down bracket, and the shroud. Reconnected the battery. Jumped in to start it and check the charging voltage, fine.. 14.3V I did however noticed, that the LED display in the dash, flashed all its parts, then had the word BASE in it, until the car was started.

What does BASE mean?

As I went to go home, I got in, started the car, put it in reverse, and the engine had dropped down to 300rpm, and shuddered pretty bad, then the revs proceeded to climb to near normal speed. Basically this occurs when ever changing from P or N into D or R. It also shudders about 10km/h just as I pull up at a set of lights, also when in D or R, slight motion on the steering wheel to activate the pump also causes a shudder, just a quick drop in revs.........

With the aircon, it is a bit worse.

Before changing my battery, everything worked fine. Now, after I just replaced the battery, its all gone to ИИИИ. How can a consumable such as a battery cause so much grief with the motor.

I have seen 2 auto electricians, one of them has attached his Diagnostics computer to just under the footwell. He said it has returned no trouble/fault codes.

The other, said that the problem is rare but it can happen where the ECU has to relearn all the sensors, elecronics that make the engine work. He recommeded taking it for a bit of a drive, so I have 140km drive out west and back. To no avail, Ive tried the 2 min in d with ac 2 min without ac etc etc.. That does not work niether.

I would appreciate any help that you all can give me..

Kind Regards.
Adam