Hey guys hoping someone can help me out my 02 supercrew f150 5.4. had a intermittent starter grinding issue started about 2 year ago and got worse as time went on. I have already replaced the flex plate as it had some teeth worn out and have tried 3 different starters including a remanufactured Ford starter. And it still keeps on grinding sometimes. I have also looked through some of the forums and tried some of the solutions suggested I have upgraded the starter, ground cables, and battery cables for larger ones replaced the starter relay on the firewall and replaced the ignition switch. I have taken to a mechanic and they can't find out why it does it and only in one specific spot. I have noticed that sometimes when I try to start it will grind but then turn the key back and try again and it will start no issue or if I roll it forward or back while in gear ot will start with no problems. So far all the solutions I have looked at in the forums don't seem to fix my issue. Thanks in advance.
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When I had a similar problem I found the cause was a weak battery. Replaced the battery and problem solved.

 

​​​​​​Thanks. I had my battery tested today both in the truck and out and it tested good both times.

 

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I've been having the same intermittent grinding issue for the last 60k miles, but mine doesn't feel like getting worse yet.