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Discussion Starter #1
Yesterday I went to start my car and it acted as if it was out of gas. I tried turning it over again and got the same response. On the third try the car fired up and ran like it should. I moved it to the end of my 1/4 mile long driveway to cut grass.

When I got back in the car the same exact thing happened. Once I got it back to the house I decided to run a check on any codes (there was no service engine light). I had a P0340, which I think is a crank position sensor.

I decided to drive the car and see how it ran. It runs and drives fine. The starting issue remained.

I stopped at my usual Circle K gas station and uploaded the stock tune back onto the car and fired it up with a struggle. Then I uploaded the Bama V2 Race Tune. That was a disaster that I have yet to try again. The theft light became a strobe and I had a check engine light with the P0340 code back. I then put the Performance Tune back that I have had on the car since day one of me owning it.

I decided to top the car with fuel and come home. The car turned over and popped, almost as if it wanted to backfire. Then it started normally. I had no more problems until this evening.

I did notice the stadard P1000 code (the normal code you find when the computer is reset). I have driven the car 200 miles since yesterday. That should have been deleted.

Now the car will spin over, spit, and do nothing. After 4 or 5 tries the car runs great as far as I can tell, with no code.

I have read that I could have alternator issues, a cam sensor issue, spark plug or fuel issues, etc. This is my daily driver and only transportation. I need a few ideas on what to check, how to check it, and what to replace if need be.

I am confused, irritated, and not sure where to go from here. Add angry to the list.
 

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Discussion Starter #6
Test the charging system first. It is very common for a bad alternator to trigger the P0340 code.
At idle the data log says 13.5 volts on average?

I'm having an issue with the car starting. Once it is running everything appears fine.
 

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Discussion Starter #7
I am hoping it isn't a timing issue. The previous owner had the entire timing assembly replaced about a year before I bought the car. I cannot remember why.
 

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The theory is, the alternator may be charging fine, but if there is a bad diode it may be causing an electrical interference that causes the computer to misread the information from the cam sensor. That will cause the hard starting condition.
 

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Discussion Starter #9
The theory is, the alternator may be charging fine, but if there is a bad diode it may be causing an electrical interference that causes the computer to misread the information from the cam sensor. That will cause the hard starting condition.
This has to be an issue that is primarily found in Ford.
 

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Discussion Starter #10
That is an expensive part too. Now I need to learn how to test the alternator and determine if a diode is bad.
 

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Discussion Starter #11
After a bit of messaging with Keeney I am going to try replacing the cam position sensor before replacing the alternator. The sensor is a much cheaper repair if it works.
 

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Bring it by and we can put in mine and see if this issue persists.

Sent from my SAMSUNG-SM-G920AZ using Mustang Evolution mobile app
 

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Discussion Starter #17
Bring it by and we can put in mine and see if this issue persists.

Sent from my SAMSUNG-SM-G920AZ using Mustang Evolution mobile app
That may be worth a try. I think you said you had one in your garage. It will be later today or tomorrow before I break free from this weekend.
 

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Could be a pats issue. Mine would do that and the theft light would strobe like you said. Got my tuner to turn off pats and it doesn't do it any more.

Sent from my SM-G935T using Mustang Evolution mobile app
 

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That may be worth a try. I think you said you had one in your garage. It will be later today or tomorrow before I break free from this weekend.
We can pull the one off my car for testing. We'll get it figured out Monday.

Sent from my SAMSUNG-SM-G920AZ using Mustang Evolution mobile app
 

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Discussion Starter #20
Could be a pats issue. Mine would do that and the theft light would strobe like you said. Got my tuner to turn off pats and it doesn't do it any more.

Sent from my SM-G935T using Mustang Evolution mobile app
My PATS is deactivated. I hate that system with a passion.
 
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