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Car sometimes won't start, but battery is fine?
03-18-2014, 01:01 AM
Post: #1
Car sometimes won't start, but battery is fine?
I have a 2005 Honda Civic.

Sometimes (maybe once every month or two) I try to start my car and it won't start. No lights or anything when I turn the ignition and seems like the battery is dead. But when I open and close my door hard enough to slightly shake the car, the car starts fine. Sometimes it takes a few tries of opening and closing the door. When the car does start, my radio is reset, meaning the connection to the battery was lost.

I looked at the terminals of my battery and they seem pretty clean. Is there a loose wiring somewhere in my car? Should I try to clean my battery terminals?

My friend has recommended me to use a UCANDAS VDM Wireless Diagnostic Tool to diagnose. I being considered....

[Image: m6.jpg]


Any advice is greatly appreciated.

Thanks!
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03-18-2014, 10:17 AM
Post: #2
RE: Car sometimes won't start, but battery is fine?
I would guess that there is a poor connection by what you are saying. However, you usually can’t “see” a poor connection. Each connection should be removed, cleaned, apply dielectric grease, and properly tightened. Start at the battery negative terminal and leave it disconnected until you finish the rest of the connections. You should clean the other end of the the ground where it connects to the engine block and the other end of the positive where it connects to the starter. While you are working look for swelled, rubbed, or melted insulation on the wires. These are all problems that will need repaired to prevent problems in the future.

A scan tool really won’t help in this situation. It will tell what you already know, Loss of power. It is up to you to find that loss.

Please let us know what you find.

Thanks for using the forum,
Garner

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03-18-2014, 10:17 AM
Post: #3
RE: Car sometimes won't start, but battery is fine?
I doubt any sort of scanner or fancy test tool will help diagnose an issue like this because when battery power is lost so is most all other communication and memory storage. Most likely you are looking for a poor connection not at the battery but at the other end of the battery cables where they meet the starter and the engine block. Could even be the main connector going to the back of the fuse block. If slamming the door fixes it then the same might also make it crap out again. I would start looking around the old fashion way. Also, just because the connection "looks good" doesn't mean it's working. Sometimes it's easier to clean and tighten anything you can put a hand on, which makes one less thing on the list as you go along looking for other issues.
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