WOT after battery disconnection?

[Heysie]

I remember with the Gen I, after the battery has been disconnected, you had to put the pedal to the metal twice ( with ignition on) before starting the car.

Is that also the case with a Gen IV, with a Mopar PCM?

[redrichard]

Had no such issues on replacing GenIV battery, owners manual stated car would throw code if discounted for more than 60 seconds. Then reset on driving. Try to remove hold down bolt first then loosen and clean terminals before you pull out old battery. What make battery are you getting, there are good post on replacement batteries here.

[Steve M]

You shouldn't have to do anything like that...the throttle parameters are stored in the PCM, and aren't volatile memory, so it should still be there when you reconnect the battery.

Now, that said, do be prepared for a check engine light...something related to a timer that monitors how long the battery has been disconnected. If you make a quick swap, you might not hit whatever threshold needs to be hit, but I had mine disconnected for a couple of hours while I was messing with the wiring that feeds my amplifier, and it set the check engine light. It'll go away on its own.

[Heysie]

The battery is disconnected for a couple of days, because I'm installing a Kill switch in the car.

I don't work that fast...:witless:

[Steve-Indy]

As I recall, there have been reports of PCM failures on Gen IV's with sudden power kill. Obviously, this was overcome on the ACR X Vipers.

Heysie, how do you plan to wire in the kill switch?

[BillyC]

I remember with the Gen I, after the battery has been disconnected, you had to put the pedal to the metal twice ( with ignition on) before starting the car.

Is that also the case with a Gen IV, with a Mopar PCM?


I had my battery disconnected for four days, while sitting at a car show in Houston.
I also have the Mopar PCM.
No issues/lights when I connected and drove home, 60 miles.
BillyC

[Heysie]

As I recall, there have been reports of PCM failures on Gen IV's with sudden power kill. Obviously, this was overcome on the ACR X Vipers.

Heysie, how do you plan to wire in the kill switch?

9471

I've cut the main feed just before the fuse box.
And only used connection #1 with the resistor as in the picture.
Don't use connection #2, because the ignition coil is fused after the kill switch. So that will be shut off automatically.
Did already pulled that fuse with running motor and the engine did quit.

[JonB ~ PartsRack]

I remember with the Gen I, after the battery has been disconnected, you had to put the pedal to the metal twice ( with ignition on) before starting the car. Is that also the case with a Gen IV, with a Mopar PCM?

-NO-

[That Gen 1 trick was just so it would idle...it would still start if you did not comply, but would die. Many 'stumbled' into the solution. ]