Opinions Matter

c/auto-mechanics

16

umac71•1d ago

Just realized I wasted $150 on the wrong impact wrench

Last month I had to choose between a cordless impact wrench for $150 or a pneumatic one for the same price at the auto parts store near my shop in Phoenix. I went cordless because I hate dragging hoses around, thinking it'd be fine for general work. First week it stripped a bolt on a Chevy Silverado lower control arm because it just didn't have the torque. Took me an hour with a breaker bar to fix my mess. The pneumatic one I tried at a buddy's place afterward had way more guts for the same money. Anyone else regret chasing the cordless dream on bigger jobs?

17

caleb140•1d ago

Walked into my buddy's shop 3 months after he switched to full synthetic in his fleet and the sludge difference in those old Ford vans was wild

He pulled the valve covers off a 2012 E-250 with 180k miles that had been running conventional oil for 8 years, and after just 3 months of full synthetic you could see the clean metal peeking through where the dirty buildup used to be thick like peanut butter, anyone else see results that fast?

3

uma_baker88•1d ago

That time a broken brake bleeder screw in a 2005 Civic taught me to always use anti-seize

I was working on my buddy's Civic last Saturday in my driveway and snapped the bleeder clean off, then spent 3 hours drilling it out, and now I hit every bleeder screw with anti-seize before I even touch it, has anyone else had a bleeder seize up on them?

5

amy_sanchez•1d ago

Had a day last week where every single bolt came out smooth

I was doing a timing belt on a 2012 Honda Accord last Wednesday, and normally I fight with rusted bolts for half the job. But that day, every bolt from the crank pulley to the tensioner turned with just a ratchet, no breaker bar needed. Has anyone else had a random perfect day where the car just cooperated for no reason?

8

cole_patel41•5d ago

Just spent 6 hours chasing a parasitic draw on a 2012 Civic

I had this Honda come in with a dead battery every morning. Customer said it started fine during the day. I checked the alternator and battery first, both tested good. Then I pulled the fuse box and started testing each circuit with my multimeter. Found a 0.5 amp draw on the interior light circuit but all the lights were off. I checked the door switches, the glove box light, everything. After 3 hours I was ready to pull my hair out. Turns out the trunk light switch was stuck partially closed from some junk piled in there. Took me 6 hours total to find a 50 cent fix. Has anyone else spent way too long on something that simple?

12

park.riley•5d ago

The guy who said I didn't need a torque wrench on lug nuts was dead wrong

So last summer I was working on my buddy's F-150 in my driveway in Austin, and this retired mechanic from down the street walks over. He sees me pulling out my torque wrench and laughs, says I'm wasting time, that lug nuts just need to be 'snug plus a grunt.' I figured hey, the guy's been turning wrenches since the 70s, he probably knows something. So I started just going by feel on that truck and a few other jobs. Fast forward to three months ago, I'm driving my own Civic on the highway and feel a shake in the steering wheel. Pull over, and two lug nuts on the front passenger wheel had worked themselves loose. Another quarter mile and I might have lost the whole wheel. Now I torque every single lug nut to spec, no exceptions. Has anyone else gotten bad advice from an old timer that almost cost them?

18

cameron_webb•5d ago

Had to pick between a used Snap-on scan tool and a new Autel last month. Still wondering if I made the right call.

My old Actron finally died after 12 years. Found a Snap-on Solus Pro for $900 on marketplace but it was 2 hours away. The Autel MaxiCOM MK808 was $850 new with a warranty. I went with the Autel because I figured new tech would have more coverage. It works fine. Does what I need. But every time I see a used Snap-on roll into another shop I wonder if I missed out on something. Has anyone else tried both and regretted one choice?

12

mark_smith59•6d ago

Wasted $80 on a 'professional' brake fluid flush machine

Tbh, I thought I was being smart buying one of those power bleeders from the tool truck. Figured it would save time on flushes. Ended up pushing air into the ABS module on a 2011 Focus. Had to take it to the dealer to get the module bled with their scanner. $80 for the tool plus $150 for the dealer visit. Just use a vacuum pump and a buddy on the pedal next time.

15

kevin218•8d ago

Had a chat with a retired fleet mechanic yesterday that made me rethink how often I change oil on shop trucks.

He said he ran his personal F-250 12,000 miles between changes using cheap dino oil and sent samples to Blackstone every time, and all five reports came back fine, so now I'm wondering if I'm just throwing money at 3,000-mile intervals for nothing.

8

the_julia•8d ago

Just fixed a vacuum leak on a 2012 Ram that had me stumped for 3 days

It was a hairline crack in the plastic elbow behind the intake manifold, right where you can't see it without a mirror. Took me 45 minutes with some JB Weld and a prayer - has anyone else had luck patching those instead of replacing the whole assembly?

1

cole_patel41•9d ago

Was dead set against those plug-in hybrid scan tools until a job in Detroit changed my mind.

I was working on a 2018 Ford F-150 with a weird electrical gremlin and my old Autel couldn't crack it, then a buddy handed me his Innova 5610 and it nailed the issue in 2 minutes. Has anyone else had a tool they hated turn out to be the real deal?

17

christophers27•14d ago

TIL I've been over-torquing lug nuts for a decade

A customer came back with a warped rotor, and I realized I'd just been cranking them down with my impact gun set way too high. I checked the spec for a 2018 Civic and it's only 80 ft-lbs, which feels like nothing. How do you guys keep yourself honest on the torque wrench for stuff you do a hundred times a day?

4

iris_jones89•15d ago

Shoutout to the guy who told me to try a bore scope on that old truck

I was working on a 1998 Ford F-150 with a rough idle, and this older mechanic at the shop kept saying I should check the cylinders with his cheap bore scope. I thought it was just a toy, you know? But after two days of swapping sensors and checking vacuum lines, I finally borrowed it. Found a huge chunk of carbon stuck under a valve on cylinder 3, clear as day. That was about six months ago, and now I use my own $150 scope from Harbor Freight at least once a week. It's saved me so much guesswork on engine noises. Anyone else have a tool they doubted that turned into a must-have?

11

the_sam•16d ago

Had a customer's old truck that was running rough, turned out to be a cracked vacuum line behind the intake

This was on a '92 F-150 that came in last Tuesday. The guy said it had a bad idle and would sometimes stall at lights. I started with the usual stuff, plugs, wires, fuel filter, but nothing fixed it. I was about to call it a day when I decided to just spray some carb cleaner around the base of the intake while it was running. The engine speed jumped up right behind the throttle body, and sure enough, there was a tiny crack in a vacuum line I couldn't even see without a mirror. It was maybe an inch long, tucked way back there. Replaced that one piece of hose for about two bucks and the truck ran smooth as glass. It's crazy how such a small, cheap thing can cause such a big headache. Anyone else have a story about a simple vacuum leak that took forever to find?

12

palmer.jana•17d ago

Saw a tech at the local parts store trying to seat a bead with starting fluid, no tire cage in sight.

He sprayed a whole bunch into a 35-inch mud tire on the floor and lit it. The explosion was so loud it set off a car alarm across the street. That method is a fast track to a trip to the ER if the wheel lets go. I've seen a rim split a cage before. What's the safest way you guys handle big, stubborn beads in a pinch?

23

jamie794•17d ago

I finally gave up on that old impact gun after it seized on a brake job

It was a cheap Harbor Freight one I bought 5 years ago, and the motor locked up trying to break a caliper bracket bolt loose. I had to finish the job with a breaker bar and a lot of swearing. Anyone have a recommendation for a reliable mid-torque model under $300?

28

angelas78•18d ago

A veteran tech at our shop in Boise told me I was over-torquing aluminum oil pan plugs, which was causing thread galling.

He showed me how to use a torque wrench set to 18 ft-lbs and a dab of anti-seize, and I haven't stripped a single one in the 6 months since, so what other small torque specs do you guys always double-check?

7

sageallen•18d ago

A flatbed driver in Memphis told me 'Never trust the paperwork' after a load shift.

Now I walk the entire trailer before I even touch the straps. Anyone else had a close call like that?

4

emery_craig•19d ago

Question about using a $40 digital multimeter versus a $10 analog one on a 2012 Ford Focus

I was chasing a parasitic drain on a customer's car last week. Started with my old analog meter from trade school. The needle bounced so much I couldn't get a stable reading, wasted over an hour. Switched to my newer digital meter, set it to the 10A DC setting, and had a solid 0.23 amp draw in under five minutes. Found a bad module keeping the network awake. The auto-ranging and clear display on the digital one made all the difference for this kind of precise work. For basic voltage checks, the analog is fine, but for modern electrical diagnosis, I'm sticking with digital. What's your go-to meter for electrical gremlins?

24

joseph_murray8•19d ago

That 'easy' alternator job on a 2014 Fiesta turned into a 12-hour nightmare.

Everyone says they're simple, but the bracket design meant dropping the subframe just to get the old one out. Has anyone found a decent shortcut, or is it always a full day's work?

22

anthonyhunt•20d ago

Went to the junkyard in Springfield and saw a whole row of cars with the same broken part

I was pulling a door for a Civic and noticed at least eight other cars, all different makes, had their lower control arm bushings completely shot on the driver's side. The guy running the yard said he sees it all the time, especially on cars from up north. I used to think that was just a wear item, but seeing them all fail in the exact same spot makes me wonder about road salt and design. Anyone else notice a specific part that fails the same way on a bunch of different models?

3

max_ramirez48•21d ago

Switched from my old impact to a stubby Milwaukee for tight spaces

Always thought my full-size was fine, but after struggling with a starter bolt on a Ford in a cramped bay for 45 minutes, I grabbed a buddy's M12 stubby. Got it out in like 10 seconds flat, so I bought one the next day. Anyone got other go-to tools for those impossible spots?

1

thomas.cameron•21d ago

Choosing between a factory scan tool and a good aftermarket unit for a 2018 Ford

Had a 2018 F-150 in the shop last week with a persistent transmission code. The owner wanted it fixed right but was on a budget. I was faced with a choice: push for the expensive factory IDS tool subscription, which I knew could talk directly to the TCM, or try to solve it with my regular aftermarket scanner and some old-school diagnosing. I went with the aftermarket route first, figuring I could save the customer some money. I spent about two hours checking wiring, grounds, and fluid levels, which my scanner couldn't fully see. In the end, it was a corroded connector at the transmission range sensor, something a basic voltage test found. The factory tool would have pointed right to it, but the process taught me more. Has anyone else found that skipping the fancy tool sometimes leads to a better, more complete fix?

15

troy_palmer76•22d ago

Warning: that weird coolant leak might be coming from the heater control valve

I was working on a 2012 Ford Escape in the shop yesterday, and the owner said it was losing coolant but he couldn't see a puddle. I checked the usual spots, hoses, radiator, water pump, and everything was dry. I was about to give up when I saw a faint pink crust trail running down the firewall. It led right to the plastic heater control valve, which was cracked on the bottom side. You couldn't see the crack from above at all. I had to pull the air box to get a mirror on it. Replaced the valve and the hose clamps, cost the guy about $85 in parts. Has anyone else run into one of these hiding its leak like that? Seems like a common fail point on that model.

7

nancy820•24d ago

Tried a new penetrating oil on a seized caliper bolt in a Tacoma and it actually worked too well

I was working on a 2015 Tacoma with a rear caliper bolt that was completely frozen. I grabbed a can of this new stuff called 'Freeze-Off' instead of my usual PB Blaster. After two sprays and waiting about ten minutes, the bolt came out so easily I almost stripped the head with my impact because I wasn't ready for it. Has anyone else had a penetrant work a little too fast and cause a different problem?