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How to jump start late model cars (2007 and up)


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davethewave
New User

Oct 1, 2018, 2:50 AM

Post #1 of 7 (107 views)
How to jump start late model cars (2007 and up) Sign In

   I do roadside service in a 2007 HHR.On jump starts,when the jump box fails to start the dead vehicle,I connect cables,
and some times run my car for a few minutes to rejuvenate the dead battery.
Now here's my question: When the customer goes to crank over their car should the HHR be running or off to prevent
possible damage to the ECU (computer)?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 1, 2018, 5:20 AM

Post #2 of 7 (98 views)
Re: How to jump start late model cars (2007 and up) Sign In

You shouldn't be using your vehicle at all to jump cars.
There is high risk to your vehicle regardless of how you do it. Your computers aren't really at risk unless you hook the cables up wrong but the alternator is at risk even if the jump is done with the engine off which wouldn't be much help anyway.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



davethewave
New User

Oct 1, 2018, 8:49 AM

Post #3 of 7 (83 views)
Re: How to jump start late model cars (2007 and up) Sign In

No alternator problems after doing jump starts for 10 years.But I'm now looking at replacing the computer for the second
time!Thanks for your answer.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 1, 2018, 9:00 AM

Post #4 of 7 (81 views)
Re: How to jump start late model cars (2007 and up) Sign In

Let me tell you that alternators were made quite differently 10 years ago. Todays alternators are far more sensitive and far more expensive.

The only advice you can get from us is to stop jump starting cars with yours.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 1, 2018, 9:02 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 1, 2018, 9:34 AM

Post #5 of 7 (73 views)
Re: How to jump start late model cars (2007 and up) Sign In

Dave - same lecture - quit it using your vehicle. Do this if you do that a lot for assorted vehicles. Get a whole new battery, dual post universal that fits many keep that one charged fully all the time for a jumper box or install that one temporarily or sell it if fit is really right and enough for the vehicle's rating/customer's car if what you are doing.


Then you don't leave a dead vehicle to burn up things trying to charge probably a hopeless battery. Only pest is a real battery powerful enough is heavy and need real good jumpers or don't at all if no go use a memory saver on dead car if not totally dead do that one a favor put one ready to go in.
Said this a ton of times common flooded lead/acid batteries can't take going totally zero dead much or at all the newer the vehicle the more important.
If doing this for biz do it better than most road service calls so now is make problems that show up a couple days later or longer low battery or neglected isn't good for anything in cars and NEVER was just lots worse now,


T



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 1, 2018, 9:54 AM

Post #6 of 7 (68 views)
Re: How to jump start late model cars (2007 and up) Sign In

What happened to the PCM the first time? What are the symptoms? How far apart are the failures? Did the failures occur after jumping another vehicle.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


davethewave
New User

Oct 1, 2018, 4:13 PM

Post #7 of 7 (51 views)
Re: How to jump start late model cars (2007 and up) Sign In

I've used the HHR for roadside calls about 8 years now.I use a jump box first.If that don't work hook cables and run
my car a few min. Then I SHUT MY CAR OFF and tell customer try it again.This works 90% of the time and I've done
hundreds of jump starts. If at this point the car still doesn't start I start my car, CROSS MY FINGERS, and tell 'em to
try again.If the car starts, means I have just rolled the Dice ! The check engine light is now on and I'm getting false
MPG readings. The same symptoms as before. Car runs fine.






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