Engine dies after jump starting my wifes jeep

[fast46chevy]

Hello, as the title says, the cables were already hooked t her jeep. When I touched the positive cable to my bat. it killed the engine. afterwards trying to start the engine it cranks longer than normal and it will not stay running for longer than 10 seconds. There are no check engine lights on. I took it to the dealer and they said ther are no codes and said the batteries load tested low. They put new batteries in it and when I drove the truck home it did not make it. When the truck is running it runs good. It just shuts off at random times. It will start back up and then dies again. Usually after starting it 5 times it will stay running for a while. It is a 04. 5 with a auto. It had a edge juice I took it off just to make sure that was not it, it still acts the same. It has 84,000 mile on it I bought it new. I would appreciate any help. thanks.

 

[BGlidewell]

sounds like a charging or battery problem still. Measure voltage across both batteries. Should see above 12V more 13+ if engine is running. Low battery voltage will make the truck act like what you describe.



When you jump a car, NEVER do it with the charging vehicle running. If the charging vehicle batteries wont start the dead car, there's more needed than a jump can provide and you don't want two dead vehicles.

 

[Scottyg1]

sounds like a charging or battery problem still. Measure voltage across both batteries. Should see above 12V more 13+ if engine is running. Low battery voltage will make the truck act like what you describe.



When you jump a car, NEVER do it with the charging vehicle running. If the charging vehicle batteries wont start the dead car, there's more needed than a jump can provide and you don't want two dead vehicles.

Not arguring that, but never heard of this before. I've always heard to have the charging vehicle running during jumping. I have heard of never connecting both cables directly to the battery on the one being jumped.

 

[Mhannink]

ive been told that if the charging vehical is running the spike in load from connecting to the dead vehical can short the computer. that could be your problem. ive never had it happen and ive always had the charging vehical running but that doesnt mean that it cant happen. what i was told is to start with both vehicals off connect the batteries start the good one and then try starting the dead one.



as for your problem its hard to say what it is but i would look into and do more research on a computer problem.

 

[fast46chevy]

I had checked voltage at the batteries before I replaced them. One was 12. 8 and the other was 12. 9. It is at the dealer right now, they called and told me it needed a new lift pump. I hope they are right. Maybe it was just a coincidence that it died when I was hooking up the cables. thanks for the replies, I will keep you posted.

 

[cerberusiam]

Not arguring that, but never heard of this before. I have heard of never connecting both cables directly to the battery on the one being jumped.

ALWAYS do both, jumnping vehicle off and the ground cable hooked to engine ground NOT the negative battery cable on the jumnped vehicle or you run the risk of this:

It is at the dealer right now, they called and told me it needed a new lift pump.

and\or other expensive electronics that need replaced. Load side is protected but the ground circuits are NOT protected back to the ECU. Inducing a feed into them is way too easy and destructive.



Most of these jumper cables out there are not jumper cables, they are charging cables. They will NOT carry the load need to start the vehicle and will do harm to the jumping circuits.



The LP going bad could be a coincidence, but, it has as much a chance as being the result of jumping with the engine running.

 

[Prairie Dog]

On a modern vehicle the donor vehicle should not be running. Otherwise a spike may travel through its electronics and kill something. I killed a turn signal module once that way.

 

[MChrist]

Wow, I've been lucky, then!! I'll be sure to remember this next time I need to jump another car.
This kind of info pays for the subscription to TDR many times over.
Hope all turns out well.

 

[BGlidewell]

the alternator on the running vehicle is the most likely candidate for a toasting. have them tell you about the state of the charging system while they still have it.

 

[BGlidewell]

YouTube - ‪How To Jump-Start Your Car‬‏
front engine porche! LOL!

 

[Scooby]

It surprising to see how many people don't know how to jump start a vehicle... .

The order is:

(With donor vehicle off)

Positive cable to positve battery terminal on dead car

Positive cable to positive battery terminal on donor car

Negative cable to negative battery terinal on donor car

Negative cable to ground on dead car.

You should see a spark on the ground connection and should also be albe to start the dead car witout startig the donor.

 

[rbattelle]

It surprising to see how many people don't know how to jump start a vehicle... .

The order is:

(With donor vehicle off)

Positive cable to positve battery terminal on dead car

Positive cable to positive battery terminal on donor car

Negative cable to negative battery terinal on donor car

Negative cable to ground on dead car.

You should see a spark on the ground connection and should also be albe to start the dead car witout startig the donor.

This is how I do it, except I leave the donor running. Furthermore, I idle up the donor just before and during the dead vehicle start.

TO JUMP START A DISABLED VEHICLE:

(1) Raise hood on disabled vehicle and visually inspect engine compartment for:

- Battery cable clamp condition, clean if necessary.

- Frozen battery.

- Yellow or bright color test indicator, if equipped.

- Low battery fluid level.

- Generator drive belt condition and tension.

- Fuel fumes or leakage, correct if necessary.



CAUTION: If the cause of starting problem on disabled vehicle is severe, damage to booster vehicle charging system can result.



(2) When using another vehicle as a booster source, park the booster vehicle within cable reach. Turn off all accessories, set the parking brake, place the automatic transmission in PARK or the manual transmission in NEUTRAL and turn the ignition OFF.



(3) On disabled vehicle, place gear selector in park or neutral and set park brake. Turn off all accessories.



(4) Connect jumper cables to booster battery. RED clamp to positive terminal (+). BLACK clamp to negative terminal (-). DO NOT allow clamps at opposite end of cables to touch, electrical arc will result. Review all warnings in this procedure.



(5) On disabled vehicle, connect RED jumper cable clamp to positive (+) terminal. Connect BLACK jumper cable clamp to engine ground as close to the ground cable attaching point as possible.



(6) Start the engine in the vehicle which has the booster battery, let the engine idle a few minutes, then start the engine in the vehicle with the discharged battery.



CAUTION: Do not crank starter motor on disabled vehicle for more than 15 seconds, starter will overheat and could fail.



(7) Allow battery in disabled vehicle to charge to at least 12. 4 volts (75% charge) before attempting to start engine. If engine does not start within 15 seconds, stop cranking engine and allow starter to cool (15 min. ), before cranking again.



DISCONNECT CABLE CLAMPS AS FOLLOWS:

- Disconnect BLACK cable clamp from engine ground on disabled vehicle.

- When using a Booster vehicle, disconnect BLACK cable clamp from battery negative terminal. Disconnect RED cable clamp from battery positive terminal.

- Disconnect RED cable clamp from battery positive

terminal on disabled vehicle.

-Ryan

 

[fast46chevy]

Well, I got my truck back yesterday from dodge. I drove it 15-20 miles last nite and I drove it to work and back today. It seems to be doing ok ,I will keep my fingers crossed.