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-   -   4.8is no start, only one click. (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/110566-4-8is-no-start-only-one-click.html)

Kingfisher 07-17-2019 05:45 PM

4.8is no start, only one click.
 
Having a starting issue here car won't crank, it only click once when turning the key. I tried 2 brand new batteries so it's not a battery issue. I can hear the fuel pump working and everything and the car DOES and only start with a jump from the jumping terminals.

Today I got the starter replaced with a new one but that didn't fix it. Still the one click. Old starter did test good at the Auto zone. Battery terminals are measured at 12.7 volts, the grounds measured the same. There is significant power draws from the battery after a couple of tries.

Any ideas what else I should look into from here? EWS, DME? How do you properly diagnose those modules? Thanks!

wpoll 07-17-2019 09:39 PM

The "click" symptom usually indicates a severe voltage drop when the battery is connected to the starter and a high current is drawn. This is normally caused by a bad battery with a high internal resistance but since you have eliminated this, I'd say you have a bad joint in the cable running from the battery to the starter solenoid. Or a bad starter solenoid, but I assume that was changed along with the starter (they are usually sold as a unit).

First thing to check would be the BST (battery safety terminal) - it may have come apart internally. Next check that any joints (X6404 & X7163) in the main positive lead that runs from the BST to the starter solenoid are clean and tight.

https://www.newtis.info/tisv2/a/en/e...-motor/bEud1CV

My guess? Bad BST....

andrewwynn 07-18-2019 09:45 AM

Yes bst.

andrewwynn 07-18-2019 11:49 AM

You can run a jumper cable from the battery to your B+ to determine if the battery cable is at fault. I read there is a connection at the B+ that can be the fault also.

Kingfisher 07-18-2019 04:41 PM

Quote:

Originally Posted by wpoll (Post 1166085)
The "click" symptom usually indicates a severe voltage drop when the battery is connected to the starter and a high current is drawn. This is normally caused by a bad battery with a high internal resistance but since you have eliminated this, I'd say you have a bad joint in the cable running from the battery to the starter solenoid. Or a bad starter solenoid, but I assume that was changed along with the starter (they are usually sold as a unit).

First thing to check would be the BST (battery safety terminal) - it may have come apart internally. Next check that any joints (X6404 & X7163) in the main positive lead that runs from the BST to the starter solenoid are clean and tight.

https://www.newtis.info/tisv2/a/en/e...-motor/bEud1CV

My guess? Bad BST....

Thanks much for the reply, I took your hint and did more testing. I jumped the car this morning and what I found was that the jumping terminals under the hood are getting above 14.5 volts from the alternator, however, the battery terminals in the trunk do not getting any charge from the alternator, voltage was 12.05 and dropping before I shut it down. That probably explains why I can jump the car but not be able to start it on its own. I'll take a better look at the BST and the cables as soon as I can.

Kingfisher 07-19-2019 05:01 PM

Unfortunately I have ruled out the BST. It doesn't seem to be detonated and I do get voltage from it, I can also charge the battery from the jumping terminals under the hood so I think the BST should be fine. So the situation now is that I'm not getting a charge from the alternator, and no voltage to turn over the starter when turning the key.:dunno:

wpoll 07-19-2019 05:10 PM

A voltage test does not rule out the BST - a voltage test requires near-zero amps - a crank requires over 200A.

Put a jumper cable from the battery+ to the jump terminal under the hood or the large + terminal in the trunk. If the car starts, the BST or cables are bad.

Kingfisher 07-19-2019 06:07 PM

I don't think I have a jumping cable that long but I will definitely get I tested as soon as I can.

andrewwynn 07-19-2019 09:12 PM

It seems like a bad connection at the B+ somebody on the forum recently had that exact problem.

Kingfisher 07-19-2019 11:31 PM

Quote:

Originally Posted by andrewwynn (Post 1166220)
It seems like a bad connection at the B+ somebody on the forum recently had that exact problem.

Do you have the link or key words so I can search for it? Thanks!


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