r/AutoMechanics

I’ve been messing around with an old Peugeot project car and I wanted to try building my own speedometer setup instead of replacing the whole instrument cluster. The car has no ECU, so from what I understand the gearbox uses a 3 pin hall sensor for speed readings.

I’m still pretty new to Arduino stuff, so this is partly a learning project and partly me being stubborn about fixing old cars in weird ways lol. I’ve watched a bunch of videos already but everybody explains things like you’re supposed to magically know electronics beforehand.

Right now I’m trying to figure out what hardware I’d even need besides the Arduino board itself. Some people mention pull up resistors and signal converters while others make it sound super simple. I also noticed a lot of DIY speed measuring instruments and sensor kits seem to come from the same industrial suppliers that list components through online manufacturing catalogs.

I don’t need anything super polished. I just want a reliable digital speed readout that won’t freak out while driving.Anybody here done something similar and willing to explain it in beginner language?

.They’ve replaced both O2 sensors, the thermostat, and the coolant sensor. The engine isn’t really running hot as far as I can tell. Gauges don’t change, doesn’t smell hot or feel hot. Anyone have any suggestions?

First is a 65 Cadillac DeVille. So my battery kept dying and got a new one that it needed it was old. Then started a few times and dead so charged it and started fine but was charging 19-20 took to auto parts store the said it was my alternator. ok is old and I have a new one installed it same issue pissed thinking it was the alternator called the place I bought it from and the said it’s a bad regulator great that in the alternator. Fml lol instead found out it’s an external regulator so not pissed at the auto parts store that told me to change the alternator. Not mad figure everything it new so has to work I changed the regulator and ITS THE SAME ISSUE. So there is a lot of ways I can keep replacing 60 year old wiring but wanted to get some thoughts. Thanks all helpful suggestions are welcome.

Ok, I have had this truck since new, it’s the 6 cyl., 3 liter engine. 197k miles. It’s been a great machine with the usual issues. Kept it for my 19 year old to learn driving, and now for my 15 year old who just got her learner’s permit.

So daughter 2 is out driving with her mom, says the engine idled low when they started it - the were bringing it to my house, and it stalled. No huge banging seizure, just stopped. Middle of road in a subdivision.

No dash lights or warnings, just stalled.

I push it to shoulder, open hood - check oil and it’s low, just registering on tip of dipstick - oh crap! I let it sit overnight to cool down, head over early next with some fresh oil - and I proceed to pit a couple quarts in. I let it sit for several hours; get in to crank it - nothing, dash lights come on, but the starter isn’t even engaging. 1st time, nothing - 2nd time, nothing. 3rd time, turn key - sluggishly starts, I put it in drive and proceed to get it to my house probably 200 yards away.

I sit with it for a second, the idle slowly comes up to 1200-1500 rpm, it smoothes out. I turn it off. Went to try to start next morn. No joy, nothing but dash lights. Took battery to be tested, AutoZone says, “battery is good.” So I check the fuses; one 20 amp is blown, replaced it - fingers crossed, get in and - nothing.

What else could be the problem? I hooked up my OBD2 dongle and the Torque program to read code, because surely - codes! No fault codes found.

What the @#$& could this be? Oil pressure sending unit? Without codes I have no idea where to look; maybe fuel filter?

Thanks in advance!

Situation:

My 2nd Gen Sienna's speedometer is off my about 4-5 mph (it if I am driving 69mph, it's actually 65mph (confirmed by phone gps).

Background:

I left my Sienna sitting idle for a good 3 years as it as a backup car. Yeah, I should have driven it every once in a while to keep the battery up but I didn't. My bad.

After deciding I would use it again as a daily driver, I had to get a new battery and smogged, etc. At the smog station, the tech said the car's "memory" was wipped or some verbage like that and that I need to drive for a half hour or so before he could test it.

So I am thinking the Sienna thinks I am driving around on different sized tires now and that's why the speed if off.

How do I fix this?

Thank you.

I’m looking to connect with and learn from some of the more experienced men on here.

As a guy trying to navigate life, career, and relationships, I often feel like modern advice is missing something. I’d love to hear some real, unfiltered wisdom from the older generation.

• What did you worry about in your 20s/30s that turned out to be completely irrelevant?
• What are the things that actually matter in the long run?

Would love to hear your stories, even the small everyday lessons. Cheers!

I’ve called around everywhere in my local area no one will make a replacement even though they would be copying an existing set. Does anyone know of a lock smith that will make me spare keys in SE MI

I've looked up a few things but I need help. whats the best way to clean the bulb sockets and/or the best bulbs to replace them with? I really appreciate any and all advice!

2015 Chrysler 200. 84, miles. My worst fear came true... TIPM bad. Not spending 2k to fix it. What do u think? Buy a used TIPM and have a mechanic install it and program it? How much would they charge?