05 Mustang 4.0 start issue

[buell-eyed-devil]

Car worked fine till the other day it wouldn’t start. Corrosion on positive terminal pretty bad so I cleaned it, jumped it off and drove it home. Worked fine for a couple days then does it again. Battery was low so I changed it to one with 800 cc’s. Now sometimes it cranks fine and sometimes it acts like the battery is dead. Radio loses stations, no click from starter. Any ideas?

 

[buell-eyed-devil]

I turned key to on and left it for several minutes to reset alarm. Working now but I have my doubts

 

[Dirtman]

If there was bad enough corrosion on the battery terminal, it's likely the same corrosion is on the other side.

 

[buell-eyed-devil]

Problem is back. Load tested battery at almost 800cca. nothing. no codes. no nothing. Car was in a bad wreck before I got it. Seems anti theft is culprit but I dont know what to do with it. Any ideas would be appreciated

 

[rubydist]

The pats sensor surrounding the ignition lock is a fairly fragile device, and they have been known to be damaged by a hard shock like a significant accident. If it is giving you the signal that it is not reading the key chip, I would consider replacing that sensor.

 

[buell-eyed-devil]

Nothing comes up on scanner. When you turn to start everything dies

 

[buell-eyed-devil]

Something just occurred to me. The previous owner (the crasher) broke a key off in drivers door lock. To deactivate anti theft you have to unlock drivers door with a key. I wonder if this is my issue.

 

[buell-eyed-devil]

No ideas huh?

 

[Dirtman]

PATS security codes wont show up on a scanner. You have to put the key in the ignition, turn to run, and watch the anti theft light. After a minute if there is an issue it will start to flash a sequence, the sequence is the code.

 

[buell-eyed-devil]

ordered a new key barrel for door. they sent me ignition set with dongle. is key set the same? Dont think door uses a chip

 

[buell-eyed-devil]

When I turn key to on there is no anti theft anything blinking. Maybe pats sensor?

 

[buell-eyed-devil]

Car never stalled out. When it runs it runs fine. Since I towed it home nothing. Also taillights all didnt light up

 

[Dirtman]

Did you ever actually check your ground cable and ground straps? Meaning on the block side, as well as testing for internal corrosion.

 

[buell-eyed-devil]

Yes. Here's a new one. Got in Today and hit key. No start so I held it. 10 seconds later it starts but locked in park. Also right rear lights 2 of 3 don't work but bulbs are good. Car is haunted

 

[buell-eyed-devil]

Thinking about trading for a Kia