AI Boosted My Mechanical Engineering Muscle
Over one weekend I fixed a 2001 Ford Ranger that would not crank and a lawnmower that had been sitting in a shed for four years. I am not a mechanic — ChatGPT was my shop manual, and the diagnosis was driven by photos of my actual parts.
TL;DR
Over one weekend I fixed a 2001 Ford Ranger that would not crank and a lawnmower that had been sitting in a shed for four years. The truck turned out to be a stuck clutch safety switch — cost, zero. The lawnmower needed a replacement carburetor from Amazon for under twenty dollars. I am not a mechanic. ChatGPT was my shop manual, and the whole thing was driven by photos of my actual parts, not generic internet tutorials.
AI did not turn me into a mechanic. It turned my phone into a shop manual that looked at my actual parts and told me what to check next.
The Pickup That Would Not Crank
The Ranger lives in my garage through winter. Come spring I turned the key and got nothing. No crank. No click. Dead silence. Battery checked out fine.
A year ago I would have been at the shop within the hour. This time I opened ChatGPT, took a photo of the dash and the OBD scanner, and started a conversation.
The AI gave me a ranked diagnostic tree right away. Starter. Starter relay. Fuel pump. Security or immobilizer. Neutral safety switch. Each one came with the quickest isolation test to rule it out. That alone was worth more than three hours of forum threads.
What Was Actually Wrong
After an hour of back-and-forth — photos of the fuse box, photos under the hood — the AI narrowed it to the clutch safety switch. That is the little mechanical switch that tells the truck “clutch is pressed, it is safe to crank.” If that switch does not close the circuit, the truck does not crank. I did not know it existed.
I reached down and manipulated the clutch lever up and down the shaft. It was stuck, likely from winter rust. It began to work. Cost: zero. The AI did not tell me to replace the part. It told me to move it.
The Lawnmower That Had Been in a Shed for Four Years
An old push mower had been sitting in a shed for four years. I wanted it running again. Pulled the cord. Nothing. Fuel was bad, carburetor almost certainly gummed.
I sent a photo of the engine. The AI walked me through the exact sequence to remove the carburetor. Relieve spring tension first. Unhook the governor spring from the post. Disconnect the throttle rod. Then the two mounting bolts. Step by step, with cautions at each point — do not stretch the spring, do not lose track of which hole the spring hooked into, do not pry against the plastic.
Once the carb was out I cleaned it. Still gummed beyond saving. Ordered a replacement from Amazon — under twenty dollars. Installed it. Started on the first pull.
What Went Wrong
The AI led me down a dead end early in the truck diagnosis. It pushed fuel pump failure as a likely cause. I spent twenty minutes listening for the pump to prime and tapping the gas tank. That was wrong.
Once I sent a photo showing the clutch pedal and said “it will not crank at all — no click, nothing” the AI pivoted immediately to the clutch safety switch. We got to the real diagnosis in two more exchanges.
You still have to steer. The AI is not infallible. It is not a mechanic. It is a very well-read apprentice who can see what you show it and can reason about what it sees.
Lessons
Photos change the diagnosis. “It will not start” gets you generic advice. A photo of your actual fuse box, your actual clutch pedal, your actual governor linkage gets you a specific isolation test. The leverage is in the specificity.
The ranked diagnostic list beats the internet. Forum threads give you one person’s war story. The AI gave me five ranked causes with the fastest isolation test for each. That is a different kind of help.
Trust but verify. It pushed me toward a fuel pump that was fine. You still have to steer. AI is a co-pilot, not an autopilot.
The shop bill would have been several hundred. The AI fix was twenty. That is not nothing.
You learn. The AI teaches. I did not know clutch safety switches existed. I do now. I did not know the tension-relief step for a governor spring. I do now. That knowledge does not go away when the conversation ends.
Why This Matters Beyond My Garage
This is not really about cars and lawnmowers.
The pattern — photo of your specific thing, ranked diagnosis, isolation tests, fix — is the same pattern whether you are debugging a truck, a block of code, a legal document, or a medical test result. The leverage is in the specificity. Your photo, your data, your context. Generic internet content cannot compete with that.
Home mechanics used to mean you had either learned from your dad or you were brave enough to work through Haynes manuals and forum threads. Neither is required now. A phone, a conversation, and a willingness to check what the AI tells you is enough. That is a meaningful shift in who can fix what.
Cheers, Fabian Williams
If you have been putting off a repair because it feels out of reach, take a photo and start a conversation. The worst case is you learn something.
- Blog: fabswill.com
- LinkedIn: fabiangwilliams
- Twitter/X: @fabianwilliams
