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Topic Review (Newest First)
05-19-2013 11:20 AM
calebjmcgowan
Quote:
Originally Posted by Jerry Bransford View Post
The only problem causing your engine to run and idle poorly is the battery isn't charged up enough yet.

When the battery is dead or very low, it doesn't provide enough power for the alternator. The alternator on newer Jeeps and most cars REQUIRES a good solid 12 volts from the alternator to run. So if the battery was so weak to require a jump start, it won't run properly after the jump start battery is disconnected. That is because the alternator requires 12 volts for it to be able to put out enough power for the ignition system.

Charge your battery overnight using a benchtop charge & the engine run fine tomorrow.

Caution that letting a battery go completely dead physically damages the battery so it may or may not come back to 100% health after being recharged overnight. Not an hour or two, not by driving the Jeep, but by a real battery charger... overnight or all day.

The days of engines being able to run properly without a good battery are long over for all Jeeps & most cars. Really.
Thank you so much. This is very descriptive and quite helpful.
05-16-2013 09:14 PM
Jerry Bransford
Quote:
Originally Posted by calebjmcgowan View Post
So I used my car jumper to get it running and it started right up. Now, when it was running it would idle really really low, to the point where I thought it would stall. Also, the lights on the dash would flicker.
I've heard I should maybe clean the throttle body and Idle Air Control, is that a good start?
The only problem causing your engine to run and idle poorly is the battery isn't charged up enough yet.

When the battery is dead or very low, it doesn't provide enough power for the alternator. The alternator on newer Jeeps and most cars REQUIRES a good solid 12 volts from the alternator to run. So if the battery was so weak to require a jump start, it won't run properly after the jump start battery is disconnected. That is because the alternator requires 12 volts for it to be able to put out enough power for the ignition system.

Charge your battery overnight using a benchtop charge & the engine run fine tomorrow.

Caution that letting a battery go completely dead physically damages the battery so it may or may not come back to 100% health after being recharged overnight. Not an hour or two, not by driving the Jeep, but by a real battery charger... overnight or all day.

The days of engines being able to run properly without a good battery are long over for all Jeeps & most cars. Really.
05-16-2013 08:21 PM
WVU Mountainman I would fix the obvious first. Start with the battery. Take it to an auto parts store and have it tested. Have them test the alternator as well. If the battery needs replaced, replace it. Same with alt. Then tackle your other problems if they still occur.
05-16-2013 08:21 PM
krisbman
Quote:
Originally Posted by revco666 View Post
what about the alternator?
x2
05-16-2013 08:20 PM
RevCo666 what about the alternator?
05-16-2013 08:17 PM
calebjmcgowan So I used my car jumper to get it running and it started right up. Now, when it was running it would idle really really low, to the point where I thought it would stall. Also, the lights on the dash would flicker.
I've heard I should maybe clean the throttle body and Idle Air Control, is that a good start?
05-14-2013 07:17 PM
Big Cole Probably a dead cell. Take it to an auto parts store and have them test the battery.
05-14-2013 06:40 PM
calebjmcgowan
Battery troubles - help

I went to start my jeep after a couple weeks of it sitting in my driveway. It's a 01 TJ. I don't think I left a light on, but when I turned the key nothing happened, no click, nothing. I was sitting there for a few minutes and this beeping sound came on. When I turned the cabin light off (I think up to the first click is off when you turn the dial...?)

Any help?

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