Jay's Mobile Auto Repair

Jay's Mobile Auto Repair Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Jay's Mobile Auto Repair, Automotive repair centre, Lewisville, TX.

Working on a '68 F250 today. Halfway through rewiring it from headlight to taillight. Thank god these painless harnesses...
01/14/2026

Working on a '68 F250 today. Halfway through rewiring it from headlight to taillight. Thank god these painless harnesses are mostly accurate for circuit diagrams and colors. Also, please, if you cant properly wire a vehicle, DONT TRY TO!!! (I'm talking to you, mechanics!!) So much extra headache from that at the moment!

Next step will be installing the aftermarket HVAC system!!! Super cool project! I'll keep ya'll posted.

Replacing a starter on a 2020 Land Rover Discovery sport. Corrosion around the positive of this starter caused the custo...
01/13/2026

Replacing a starter on a 2020 Land Rover Discovery sport. Corrosion around the positive of this starter caused the customer to believe a dead battery was the only source of his problems. After replacing the battery, checking the fuses and swapping relays around, he finally purchased a used starter and called. Me to replace it. After further investigation, I found this corrosion around the starter motors battery feed to be the source of all his issues.

Currently working on a 2010 Ford Mustang with a 4.6L engine. Vehicle has some pretty sweet upgrades including cams and a...
01/09/2026

Currently working on a 2010 Ford Mustang with a 4.6L engine. Vehicle has some pretty sweet upgrades including cams and an intake. Customer called me after taking the vehicle to several shops, including the dealership, with no luck on resolving his issues. The vehicle stalls during a return to idle condition. Found a few issues including a vacuum leak and some MAF signal issues. Currently data and simultaneously watching MAF voltage supply with an oscilloscope. Vehicles like this are why I chose to specialize in diagnostics. These days, oscilloscopes are absolutely crucial! From Network communication issues to voltage fluctuations, without an oscilloscope, it's nearly impossible to make an accurate diagnosis.

A coolant flush is an important service to keep your engine from overheating. Old coolant can become contaminated and lo...
11/05/2025

A coolant flush is an important service to keep your engine from overheating. Old coolant can become contaminated and lose its ability to regulate your vehicle's temperature. Flushing and replacing it helps protect your engine and the cooling system components.

🔧 Understanding Your Vehicle’s 12V Charging System 🔋Your car’s 12V charging system is critical for maintaining electrica...
10/08/2025

🔧 Understanding Your Vehicle’s 12V Charging System 🔋

Your car’s 12V charging system is critical for maintaining electrical function and battery health. It primarily consists of the alternator, voltage regulator, and battery.

When the engine is running, the alternator generates AC power, which is converted to DC and regulated to around 13.8–14.8 volts. This keeps the battery charged and powers essential systems like your ignition, fuel injection, and lighting.

Common signs of charging system failure include:
⚠️ Battery warning light
⚠️ Dim or flickering lights
⚠️ Slow cranking or no start
⚠️ Electrical issues while driving

If you're seeing any of these symptoms, don’t wait — call Jay's Mobile Auto Repair. We’ll diagnose and fix charging system issues on-site, saving you time and a tow.

📞 [214-883-8261] | 🔧 Mobile service you can count on.

🚗🔋 How to Properly Jump-Start a Car Battery (and Why It Matters!) 🔋🚗We’ve all been there — you turn the key, and click… ...
10/07/2025

🚗🔋 How to Properly Jump-Start a Car Battery (and Why It Matters!) 🔋🚗

We’ve all been there — you turn the key, and click… nothing. A dead battery can happen to anyone, but knowing how to jump-start a car the right way is important for your safety and your car’s health.

Here’s a quick guide:

✅ What You Need:

A set of jumper cables

Another car with a fully charged battery

✅ Step-by-Step:
1️⃣ Park the cars close but not touching.
2️⃣ Turn both cars OFF and set parking brakes.
3️⃣ Connect red (positive) cable to the dead battery’s + terminal.
4️⃣ Connect the other end of red cable to the good battery’s + terminal.
5️⃣ Connect black (negative) cable to the good battery’s – terminal.
6️⃣ Connect the other end of black cable to an unpainted metal part of the car with the dead battery (not the battery itself!).
7️⃣ Start the car with the good battery first, then try to start the dead car.
8️⃣ Once it’s running, remove the cables in reverse order.

⚠️ Why Doing It Right Matters:

Protects you from sparks or shocks.

Prevents damage to sensitive electronics in newer cars.

Ensures a successful jump without frying your battery or cables.

Pro Tip: After jumping, drive the car for at least 15–20 minutes to help recharge the battery.

Stay safe and save this post for the next time you (or a friend!) need it. 👍

09/29/2025

🚗🔧 Why Go to the Shop When the Shop Can Come to YOU? 🔧🚗

Tired of wasting time sitting in a waiting room or trying to coordinate a ride to and from the repair shop? With Jay's Mobile Auto Repair, we bring the garage to your driveway—saving you time, money, and stress.

✅ No towing fees
✅ No long shop wait times
✅ Repairs and maintenance done at your home or workplace
✅ Personalized service from a skilled, experienced mechanic
✅ Transparent pricing and honest advice

From routine maintenance to emergency repairs, we’ve got you covered—on your schedule, at your location.

📍 Local. Reliable. Professional.
📞 Call/Text [214-883-8261] | 💬 Message us here on Facebook
🛠️ Let us take the hassle out of auto repair—the road to convenience starts here.

🚗 Understanding the 4-Stroke Combustion Cycle! 🔧Ever wonder how your car’s engine turns fuel into motion? It all comes d...
09/16/2025

🚗 Understanding the 4-Stroke Combustion Cycle! 🔧

Ever wonder how your car’s engine turns fuel into motion? It all comes down to the 4-stroke cycle, the heartbeat of most internal combustion engines:

Intake Stroke 🌀
The intake valve opens, and the piston moves down—pulling in a mix of air and fuel.

Compression Stroke 🔒
The valves close, and the piston moves up—compressing the air-fuel mixture for maximum power.

Power Stroke 💥
A spark ignites the mix, causing an explosion that forces the piston down. This is where the power happens!

Exhaust Stroke 🌬️
The exhaust valve opens, and the piston pushes the burnt gases out of the cylinder.

This cycle repeats thousands of times per minute while you drive! 🏎️💨

Did you know the average car has over 30,000 parts? 🤯Or that your car’s check engine light could be triggered by somethi...
08/22/2025

Did you know the average car has over 30,000 parts? 🤯
Or that your car’s check engine light could be triggered by something as simple as a loose gas cap?

Cars are complex machines, but don’t worry—we’re here to keep yours running smoothly. 💪
Got questions or weird noises coming from your ride? Give us a call! Don't get left stranded!

Let's talk about those pesky warning lights on the dash for a minute. What do they mean? Why do so many come on at once?...
08/12/2025

Let's talk about those pesky warning lights on the dash for a minute. What do they mean? Why do so many come on at once? Do you have more than one issue?

First and foremost is the check engine light. One thing most people don't know is that the check engine light is federally mandated to come on whenever there is an emissions related issue, and ONLY when there is an emissions related issue. An emissions issue is any malfunction that would increase the emissions being emitted from the vehicle. While it's good that the check engine light comes on to make you aware of this, not all issues or stored codes in the ECM (Engine Control Module) will set a check engine light. And always remember CODES DONT TELL US WHATS WRONG! Have a proper diagnostic performed by a competent professional.

Another extremely common light is the TPMS (Tire Pressure Monitoring System) light. This light comes on to make you aware of low tire pressure or a malfunction in the TPMS system. This can be anything from a cold snap lowering the pressure in your tire momentarily to a TPMS sensor needing to be replaced.

One of the most mistaken lights is going to be the "Battery Light". This light is actually representative of the charging system and not so much the battery. Though, the battery is technically part of the charging system. This typically means that the vehicle has recognized that the alternator is not charging properly. If this light comes on, turn off all electrical loads (radio, ac, heated seats, etc.) and pull over as quickly as possible.

Now to answer the question of whether you have multiple problems if multiple lights come on at once. The answer is typically no. Modern vehicles have a vast network of modules that depend on each others subsystems to function together. For example, the ECM will communicate with the HVAC Control Module to figure out whether or not engine conditions are sufficient to be able to turn on the ac compressor without causing any issues for the engine.

If you have a light on that concerns or annoys you, the best thing you can do is give myself or another qualified technician a call and have it properly diagnosed.

Let's talk a little bit about what a diagnostic is and what the importance of having one properly performed is.What is a...
08/08/2025

Let's talk a little bit about what a diagnostic is and what the importance of having one properly performed is.

What is a diagnostic? Diagnostics is simply a term used to describe a strategy of tests to isolate where a problem may be located and to what component it is that is specifically failing. These tests can be performed with a number of tools. These tools can range from a scan tool (the computer we use to talk to your vehicles network of modules) all the way down to a simple test light (a low amperage stand alone circuit used to test for powers and grounds with a small light bulb).

"I had my codes pulled at my local parts store. Is this a diagnostic?" No. Its important to understand that the vast majority of codes set in your vehicles modules are set by what we call inferred data. Inferred data is data that is not being directly tested. For example, "My light stopped working so I replaced the bulb. Now its still not working. There must be something else wrong that isn't the bulb." This would be an example of inferred information, or "data". Computers often do the same thing. Sometimes they are completely correct and sometimes they aren't. The important thing to understand is that they aren't right with a high enough percentage to be reliable. Codes merely point us in the direct of the system, sub system, or component that may have an issue. Without performing actual tests, there is no way to guarantee your code is correct and the components the parts store may have recommended are actually going to fix your problem. Testing and isolating components guarantees (sometimes only to the best of our abilities) that the suggested repairs will actually fix your issue.

It's important to keep in mind that these diagnostic tests require additional time and tools and therefore are provided at an additional cost. This can sometimes make people concerned it's just an upsell or a strategy to collect more money. My advice to make sure this doesn't happen is to ask your technician what tests he plans to run and what components he is trying to test and why. If those questions cannot be answered, there may be a possibility they really are trying to take advantage of you. Otherwise, its just a necessary step to making sure your vehicle is maintained and repaired necessarily and properly.

Address

Lewisville, TX
75067

Opening Hours

Monday 7am - 9pm
Tuesday 7am - 9pm
Wednesday 7am - 9pm
Thursday 7am - 9pm
Friday 7am - 9pm
Saturday 7am - 9pm
Sunday 7am - 9pm

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