Sudden loss in power after dead battery

[turboblack2door]

I let my girlfriend drive the car to work. She left the lights on and had to have it jump started now there is a dramatic loss in power. There is no cel on but it's just slow as all hell. Any ideas?

 

[redyute1]

if the ecu got reset as a result of a dead battery it will have to go through a relearn process which can affect performance

 

[turboblack2door]

how long does that take. I know with other cars it takes like 25 ignition cycles. But i've shut it off and turned it back on more than that

 

[Black95awd]

if the ecu got reset as a result of a dead battery it will have to go through a relearn process which can affect performance

+1 you need to give it time to reset the LTFT.

 

[Bubbs Malone]

This may not be the case, but could be worth looking into. After starting the car gradually got harder, the starter would baulk and it might take three trys to start the car. I found the car to be sluggish, huge loss in power. I decided, not knowing how old the battery was, I would replace it and the car has been better than ever.

From my understanding a battery will only charge so many times. If you lose a cell, then forget it, it will never be fully charged again, this will cause performance issues when the alternator tries to kick in. Good luck with the power issue.

 

[turboblack2door]

I have a turbo timer on the car and it's reading as a 13.5v so it's normal but the issue with the cell being dead in the battery would make the car hard to start at any givin time. My quesion now is since i have lifter tick would it be possible for the ecu to be pulling timing?

 

[turboblack2door]

would not having the downstream o2 in the pipe do this ?

 

[turboblack2door]

so the other night i was leaving my house and when i hit second gear the car fell on it's face and let out a big black puff of smoke out the back. I went back to the house and opened the hood to find the coupler had blown off the hard pipe from the intercooler. SO i ssaid f it and i took the greddy hard pipe kit off and put the stock pipe back on. And that fixed my issue

 

[crimsondragon]

Don't let your g/f drive your car. Simple as that.

 

[Boost92awd]

First of start your car and let it idle for about 10 minutes, this will usually get the ECU back on track. I would look into going to autozone and having your battery and alternator checked. I'm pretty sure your volts should be around 14.0-14.4 volts when the cars running.

 

[turboblack2door]

this issue has been going on for a couple months now. The battery is not bad at all but i did replace the coil packs, MAF sensor, front o2 sensor, made rear o2 simulatro, injectors and rail, bov, pluggs and nothing seemed to work. It seemed to go away when i put the stock uicp on.

 

[MASMORE]

Have you check the terminals/wires? From my experience I had a bad ground wire. I would always lose power cause of this.