Weirdest Subaru in the WORLD? (Part 1 - BARELY Runs with Alternator Connected??)
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- Опубликовано: 7 мар 2024
- I had a feeling this Subaru would be fun...and man, it did NOT DISAPPOINT!!
Customer Complaint: it BARELY RUNS with the Alternator Connected!!
Unhook the Alternator, runs beautifully! WHAT!?! HOW?!
Major Parts Cannon has been fired, and the previous owner actually SOLD this car for cheap because NO ONE COULD FIX IT!
This is a fantastic DATA-DRIVEN case study using pure raw data collected with an OSCILLOSCOPE.
Without a Scope, this Subaru will absolutely HUMBLE you!!
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Enjoy the Mystery!
Ivan
Thank you for teaching us. Because of you, I am launching a business doing advanced automotive diagnostics. I also repair and build PC's and at one time was an electrician. I wanted to expand my horizon and being in electronics and electrical my whole life, it seems like it just fits. I've been slowly acquiring all the diagnostic equipment I see on your channel to get me started. The equipment is very expensive but at the same time no one around here does the kind of stuff you do. I've seen people getting their car towed a hundred miles away to a dealer and fork out thousands of dollars in repairs when I could have went to their site to diagnose and potentially fix their problem. I also want to get into lockouts and all keys lost. I had several people over the last couple of years working at walmart come up to me frantic trying to find their car keys. This kind old lady had lost the keys to her newer Lincoln 3 times and had to have her car towed to a dealer costing her several hundred dollars to get new keys made, when I could have provided that service onsite. Because of you and other youtubers in your position, have given me a new lease on life. It's something I really want to do and being encouraged to start my business is something I needed. Thanks again for what you do showing people like me what its like to do advanced automotive diagnostics and repair.
Use a set of jump leads and make a temporary ground to the engine. Rule out your bad ground.
I worked at a Subaru shop (shame on me). The PCMs would fail in unusual ways sometimes. I would run the car with the battery maintainer set to 14.5 volts and keep the alternator unplugged. If it still acts up the pcm might be at fault. I would also check the battery ground to the body. A bad connection at that body bolt will cause all kinds of problems. One more thing to check are the two small braided ground wires from the valve covers to the body that are almost always rotted off.
My thought is poor ground/s some place. works ok at low current, but when the alternator starts trying to charge the battery the poor ground cannot handle the current. The slow cranking also hints at a poor ground or/or bad battery.
I worked at a trans shop for 10 years and it was pretty common to see 1998-2006 range dodge caravans that would shift erratically and actually upshift through gears sitting at a traffic like stopped and speedo would rise up to like 30mph or so. It was caused by bad factory alternators putting out excessive AC voltage and the output speed sensor would start picking up this AC voltage and make an erratic signal. We would unplug the alternator connector and it would go away, so we would install a new alternator and good to go, but it was the FACTORY alternators that would do this.
Reliving Saturday afternoon matinee as a kid 60 years ago ! The passenger train is heading to broken bridge ,our hero Ivan is in the cab fighting valiantly against the bad guys and the cinema screen lights up TO BE CONTINUED..........ARRRGH !!!!
Ive seen that several times on several different makes, whenever I get a car doing something weird I usually try unplugging the alternator first just because it's so quick and easy and AC voltage being put into a DC system can do crazy things to electronics!
"What would you do next?"
I’m suspicious about grounds too.
Make your own alternator harness with test lead, indicator light and disconnected wire to the ECU. If everything returns to normal, that's where you need to look for the problem.
Wild guess - use your battery maintainer to raise the voltage to 14.2 or near that without the alternator connected. See if that duplicates the alternator connected symptom. Guessing at the age of the car there is an electrolytic capacitor breaking down in the engine computer (or elsewhere) when at full running voltage.
I had a bad battery cause symptoms like yours. It made the alternator go to full output and would overload the poor little 4 cylinder. It was a huge tractor battery that the owner installed.
Case of alternator not a good enough ground to engine block
Hello, It looks like a ground problem. It should be 2 ground wires that connects heads with the engine block(under the car) and a ground wire that connect engine block with the battery and body of the car. Check that wires.
i swear i like this channel more every week.he gets into some weird rare problems, but finds solutions to 98% of them.gotta respect such dilegence & determination.
I have had two alternators that had corrosion on the ground stud that mounted the alternator's voltage regulator. I pressed out the stud, cleaned out the corrosion, coated the parts and stud hole with aluminum wire contact paste. The problem of lights dimming and brightening went away. Maddening, as the problem was intermittent, road bumps, rain, hitting the brakes and just turning the wheel at times. But when I would check it, it produced the correct voltages.
I am going to bet that the parasitic draw has something to do with it since it is a B+ circuit. Shorted wires.
my next experiment would be to remove the belt that runs the alternator and run the engine with the alternator unplugged and plugged in and see what happens. Another would be as other said keep the alternator unplugged from the vehicle and manually turn the alternator on with some kind of set up and the opposite of this. Have system voltage maintained by the maintainer and crate some kind of set up to plug into the harness and fool the vehicle into thinking an alternator is attached.
Ivan knows how to make us anticipate his next videos, & it hurts 😢
200K+ subscribers and I don't think you've asked for anyone to subscribe or even