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Crown vic no start with key
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Kprov0kie
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Sep 23, 2024, 3:13 PM
Post #1 of 21
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Crown vic no start with key
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2008
Ford Crown Vic
police
4.6
158k miles
I have a 2008 crown Vic that all of a sudden stop starting with the key I can jump a wire from the started relay to the battery and it will turn over and start just fine. I also tried hammer times of pen 86 and 30. Just a jumper wire and it starts just fine with that, so add a loss on where to go from here traced everything back and all wires seem to be put on a new starter and solenoid because I thought it was a solenoid. still same problem
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 23, 2024, 4:35 PM
Post #2 of 21
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Re: Crown vic no start with key
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You need to be real careful with that jumping out stuff. You touch the wrong contact and you'll fry your computer in a heartbeat.
What are your electrical skills? Are you able to tell me whether a contact has power or ground? Do you have an LED testlight that can detect power or ground?
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Kprov0kie
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Sep 23, 2024, 5:13 PM
Post #3 of 21
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Re: Crown vic no start with key
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I’m not pro electric guy by any means. That’s what I’m worried about is frying pcm. Or maybe it already had been. I do have test light. Thanks.
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Hammer Time
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Sep 23, 2024, 5:20 PM
Post #4 of 21
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Re: Crown vic no start with key
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I asked about a specific kind of test light. You need to be able to identify either power or ground. I can walk you through this if you have the ability to do what I ask.
This is like what I'm talking about. It's a powered LED test light
https://www.amazon.com/...r/dp/B000KIGL6E?th=1
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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.
(This post was edited by Hammer Time on Sep 23, 2024, 5:25 PM)
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Kprov0kie
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Sep 23, 2024, 6:26 PM
Post #5 of 21
(344 views)
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Re: Crown vic no start with key
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Oh gotcha. Yeah I just have regular power test light. I’ll see if I can pick up one of these.
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Hammer Time
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Sep 23, 2024, 7:29 PM
Post #6 of 21
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Re: Crown vic no start with key
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Ok, let me know and I'll tell you what to do with it.
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Kprov0kie
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Sep 24, 2024, 5:55 AM
Post #7 of 21
(316 views)
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Re: Crown vic no start with key
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Picked up one from a buddy last night. Thanks for the help!
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Hammer Time
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Sep 24, 2024, 6:49 AM
Post #8 of 21
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Re: Crown vic no start with key
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It sounds like you have identified the pin numbers of the relay so lets do some testing.
Remove the relay and test the sockets of the corresponding pin numbers. You may need to use a pin or something in the socket if the testlight is too fat to reach the contacts.
Pin 87 output to starter. Will read ground when tested
Pin 30 Power supply for starter. Should have 12v at all times
Pin 85 should have ground at all times
Pin 86 should show power when the key is held in start position
Let me know what you find and we'll go from there.
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Kprov0kie
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Sep 25, 2024, 2:05 PM
Post #9 of 21
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Re: Crown vic no start with key
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Ok! Pin 30 no power. I’m guessing that would be part of my problem!
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Hammer Time
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Sep 25, 2024, 2:15 PM
Post #10 of 21
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Re: Crown vic no start with key
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OK, then you need to look at the 30A fuse #105 in the underhood fuse box.
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Kprov0kie
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Sep 25, 2024, 2:17 PM
Post #11 of 21
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Re: Crown vic no start with key
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It does not appear to be blown/bad, but I don’t have another to replace with at the moment.
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Hammer Time
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Sep 25, 2024, 2:22 PM
Post #12 of 21
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Re: Crown vic no start with key
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If your test is correct, then that is your problem. That type fuse is very hard to tell.
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Kprov0kie
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Sep 26, 2024, 5:27 AM
Post #13 of 21
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Re: Crown vic no start with key
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Guessing my test to be wrong. Still same issue. I’m going to look at my Trs and check it maybe. I’ve tried starting in gear/neutral though but no luck. Will keep chasing!
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Hammer Time
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Sep 26, 2024, 5:35 AM
Post #14 of 21
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Re: Crown vic no start with key
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The power for pin 30 comes directly from the battery, to the fuse, to the relay socket so there is nothing in between.
Pull the fuse out and test for power in the socket to make sure the fuse is receiving power from the battery.
There is no point in chasing the neutral switch as that was resolved when you found power on pin #86. That runs through the neutral switch.
The testing I gave you systematically finds the problem area.
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Kprov0kie
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Sep 26, 2024, 5:43 AM
Post #15 of 21
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Re: Crown vic no start with key
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Fuse does appear to be powered via battery.
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Hammer Time
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Sep 26, 2024, 5:45 AM
Post #16 of 21
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Re: Crown vic no start with key
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It's a straight shot from there to the relay.
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Hammer Time
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Sep 26, 2024, 6:08 AM
Post #17 of 21
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Re: Crown vic no start with key
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Make sure you are checking the correct relay. The starter relay is marked in the previous diagram.
Here's your wiring diagram
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Kprov0kie
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Sep 26, 2024, 6:41 AM
Post #18 of 21
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Re: Crown vic no start with key
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Will double check. The more I think about it maybe I’m looking at pins wrong and do have power to 30. If so what would it be?
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Hammer Time
Ultimate Carjunky
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Sep 26, 2024, 6:43 AM
Post #19 of 21
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Re: Crown vic no start with key
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Then you retest all pins
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Kprov0kie
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Sep 27, 2024, 7:32 AM
Post #20 of 21
(52 views)
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Re: Crown vic no start with key
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I do have power to pin30. And all others seem to be functioning as well. Have tried numerous relays also and same issue. Any ideas? Thanks.
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Hammer Time
Ultimate Carjunky
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Sep 27, 2024, 7:37 AM
Post #21 of 21
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Re: Crown vic no start with key
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That's just simply not true. You can't possibly have all the circuits working correctly and tried multiple relays and still doesn't work.
You're doing something wrong. Those results can't add up. I'm just wasting my time if you are not giving me accurate test results.
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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.
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