Car won't start even while being JUMPED???

Asked by Feb 04, 2014 at 08:53 PM about the 1997 BMW Z3 1.9 Roadster RWD

Question type: Maintenance & Repair

I have a '97 Z3 and I'm completely perplexed.  I have replaced the alternator and
battery, checked the battery terminals and they're fine.  What is happening is with this
last cold snap, I had to jump the car in order to get it started (it was in our detached
garage which is not heated but at least the Z is protected from the elements).  I got it
started, put in gear and started to reverse.  The car died. Jumped the car again, left it
attached for 20 minutes, the same thing happened.  

I have no idea what could be going on.  I replaced the alternator less than a year ago
and replaced the battery just this past December.  The ground to the battery is tight.  

Went out to mess with the car again, see if I could get it started and this time it wouldn't
even start while jumped.  

Any ideas?

6 Answers

break out with the wire brush....clean the lug end that attaches to the frame ground....the spot where the lug bolts to and that 1/0 battery cable lug too~ with renewed ground potential... systems will work properly again,,,,in addition to the MAIN ground connection to frame...there is also one 1/0 battery cable connecting to the motor block as well (near the alternator)...so the starter motor can pull the requisite 300 or more cold cranking amps...in short your battery ground cable is full of road salt and rust....clean it till shiny with a wirebrush...use a NEW bolt if you can...without any corrosion on it~

2 people found this helpful.

sounds like the battery is dead.. new or not have it checked just stay away from interstate battery's there no good here in the cold there sissy hot climate battery's for out west better off using diehard in this cold...

1 people found this helpful.

ya I know you cleaned the cable...the clamp end...the other end (the business end) is what we need cleaned to allow FULL amperage through...yet supply an unwavering 12 volt source for the heated 02 sensors the ECU the TCM the BCM and auxilliary components such as winshield wiper motors and power windows~

1 people found this helpful.

...good point tt, check the 'knock off' labels on the top of your battery...these tell the date of it's first charge...since the tin/antimony alloy batteries will degrade approximately ten percent per year (stop accepting a charge) it is important that this battery is NEW and fresh if you are gonna make it through this cold snap okay~

correct me if I'm wrong, but the BMW's have TWO main ground cables...one leadin' to the chassis and one leadin' to the motor~

1 people found this helpful.
294,115

Yes , there are 2 grounds, but like ttribex said, it's probably your battery. What is the voltage? If you can't jump start it, it probably has a shorted cell. Remove the battery and take to a local auto parts store, they will test for free.

Your Answer:

Z3

Looking for a Used Z3 in your area?

CarGurus has 264 nationwide Z3 listings starting at $3,500.

ZIP:

BMW Z3 Experts

  • #1
    Tom Demyan
    Reputation
    520
  • #2
    Kelly Mayo
    Reputation
    260
  • #3
    Sleveillee
    Reputation
    230
View All

Related Models For Sale

Used BMW Z3 M
101 listings starting at $8,950
Used BMW 3 Series
898 Great Deals out of 31,547 listings starting at $900
Used Mazda MX-5 Miata
46 Great Deals out of 4,629 listings starting at $1,900
Used Chevrolet Corvette
90 Great Deals out of 15,066 listings starting at $3,620
Used Porsche Boxster
20 Great Deals out of 1,091 listings starting at $3,495
Used Ford Mustang
256 Great Deals out of 38,497 listings starting at $1,350
Used BMW M3
19 Great Deals out of 1,518 listings starting at $7,900
Used Mercedes-Benz SLK-Class
34 Great Deals out of 1,184 listings starting at $2,750
Used Porsche 911
74 Great Deals out of 4,759 listings starting at $11,000
Used Mercedes-Benz SL-Class
46 Great Deals out of 3,023 listings starting at $4,930

Used Cars For Sale

1998 BMW Z3 1.9 Roadster RWD For Sale
15 listings starting at $3,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.