MotorMD

[MotorMD @LordSamSayegh]

MYTH: a check engine light means an expensive repair.

FALSE. It means a sensor value fell out of range. Common causes: gas cap (free), dirty MAF ($10), vacuum hose ($20), plugs.

Steady = get it read this week.
FLASHING = stop driving, that's an active misfire. #CarMyths

[MotorMD @LordSamSayegh]

P0301 = cylinder 1 misfire.

Best free test in car repair: swap coil 1 with coil 2. If the code becomes P0302, it's the coil. Costs $0.

Order: plug → coil → injector → vacuum leak → compression.

Anyone replacing all coils skipped the free test. #CheckEngineLight #Torrance

[MotorMD @LordSamSayegh]

SHOP-FREE FIX: wiper blades.

Installed price: $40–$70.
DIY: $15–$30 and 3 minutes.

Lift arm → press the tab → slide off → click the new one on → lower gently (never let bare metal snap onto glass).

SoCal sun kills blades faster than rain. #CarTips #SouthBay

[MotorMD @LordSamSayegh]

MYTH: your car needs an engine flush at every oil change.

FALSE. On a high-mileage engine a flush can dislodge sludge into oil passages and kill it.

Ask any shop offering one: "What did you MEASURE that says I need this?"

That question saves more than any coupon. #CarMyths

[MotorMD @LordSamSayegh]

P0128 = engine not reaching operating temp.

Cheapest-first:
1. Low coolant (free to check, cold)
2. Thermostat stuck open
3. Coolant temp sensor
4. Air pocket in the system
5. Wiring at the sensor

"It drives fine" — until the fuel economy and the heater are gone.

[MotorMD @LordSamSayegh]

SHOP-FREE FIX: read your own codes.

$25 Bluetooth OBD-II dongle + a phone app. Or free at most parts stores.

Remember: a code is a SYMPTOM, not a part. P0420 ≠ "buy a catalytic converter."

Walking in knowing the code changes the conversation. #DIYCar #Torrance

[MotorMD @LordSamSayegh]

MYTH: using an independent shop voids your new car warranty.

FALSE. The Magnuson-Moss Warranty Act protects you.

Do the scheduled maintenance. Use the right fluids/parts. KEEP THE RECEIPTS.

Independent shop, same warranty, lower bill. #CarMyths #SouthBay

[MotorMD @LordSamSayegh]

P0442 = small EVAP leak.

#1 cause: your gas cap. Free to tighten.

Then: cracked hose → purge valve → vent valve → canister → tank.

And stop topping off after the pump clicks. That's how you kill a $300 charcoal canister. #CheckEngineLight #LomitaCA

[MotorMD @LordSamSayegh]

SHOP-FREE FIX: clean your battery terminals before buying a battery.

Corrosion = resistance = looks exactly like a dead battery.

Negative OFF first. Baking soda + water + wire brush. Positive ON first.

$5 and 15 min vs a $220 battery. #CarHacks #SouthBay

[MotorMD @LordSamSayegh]

MYTH: warm up your car for 5–10 minutes.

FALSE since fuel injection replaced carburetors (~1990).

30 seconds, then drive gently. Driving warms it faster than idling, and long idles waste fuel and build carbon.

Only real exception: defrosting the glass. #CarMyths #Torrance

[MotorMD @LordSamSayegh]

P0300 = random multiple misfire.

FLASHING light? Stop driving. You're melting your catalytic converter in real time.

Cheapest-first:
1. Spark plugs
2. Ignition coils
3. Vacuum leak
4. Injectors
5. Fuel pressure
6. Timing/compression #CheckEngineLight #Carson

[MotorMD @LordSamSayegh]

SHOP-FREE FIX: engine air filter.

Shop price: $50–$90.
Part: $15–$25.
Time: 5 minutes, usually no tools.

Open the black box on the engine, swap the filter same-side-up, close it. Hold it to the light — no light = replace it. #DIYCar #SouthBay

[MotorMD @LordSamSayegh]

P0171 = "system too lean." More air than expected.

Cheapest-first:
1. Vacuum leak (a $6 hose)
2. Dirty MAF sensor ($10 cleaner)
3. Intake gasket
4. Weak fuel pump
5. Bad injector

If someone quotes a fuel pump before a smoke test, they're guessing. #CheckEngineLight #Torrance

[MotorMD @LordSamSayegh]

SHOP-FREE FIX: check tire pressure monthly.

• Check cold
• Use the door-jamb sticker, NOT the sidewall number
• Don't skip the spare

Cost: $0. Saves fuel, tires, and a tow. #CarTips #SouthBay

[MotorMD @LordSamSayegh]

MYTH: premium gas cleans your engine.

FALSE. Octane = knock resistance, not quality.

Manual says "required" → use it.
Manual says "recommended" → you're burning ~$320/yr for nothing.

Want clean injectors? Buy Top Tier gas — in regular. #CarMyths #SouthBay

[MotorMD @LordSamSayegh]

P0455 is a large leak in the vapor system that keeps gas fumes in the tank.

The car usually drives fine. In California, the light still fails smog.

First check: gas cap on tight (click until it ratchets). If it comes back, we smoke-test the system. Don’t keep buying caps.

Hillside Auto Clinic · Lomita

[MotorMD @LordSamSayegh]

P0300 means random or multiple-cylinder misfire. One or more cylinders aren’t firing right.

Flashing light: reduce load, pull over when safe, don’t keep driving.
Steady light + a mild stumble: still bring it in soon.

The code names the symptom, not the part.

Hillside Auto Clinic · Lomita

[MotorMD @LordSamSayegh]

@daltonbrewer You guys think it will be another add on to x?

I think everything will be run through x in one year you will start buying these cars on x. What do you guys think?

[MotorMD @LordSamSayegh]

@cyrilXBT I've been using grok bot for 3 days and burned through 500 dollars worth of tokens on cursor I think I must be doing something wrong because at this point it's cheaper for me to hire an actual assistant then this.