Car Engine Misfires Jacksonville FL

Want to learn more about car engine misfires? Want to know exactly what to do if your engine starts misfiring in Jacksonville? Read this article and get some advice on what to do about such a problem.

EZ Auto Repair and Towing L.L.C.
(904) 469-8996
8521 Alton Ave
Jacksonville, FL
Promotion
30% off Repair for Brand New Customers.
Hours
Monday 9:00 AM - 5:00 PM
Tuesday 9:00 AM - 5:00 PM
Wednesday 9:00 AM - 5:00 PM
Thursday 9:00 AM - 5:00 PM
Friday 9:00 AM - 5:00 PM
Saturday Closed
Sunday Closed
Memberships and Certifications
Certifications : ASE
Services
Air Conditioning/Heating, Alignment, Alternator, Battery, Belts & Hoses, Catalytic Converter, Clutch Cylinder, Cooling System, Diagnostics, Drive Belt, Electrical System, Exhaust Systems, Filters & Fluids, Fuel Injector, Fuel Pump, Fuel System, Head Gasket, Headlight/Headlamp, High Performance Service, Ignition, Inspection, Muffler, Oil Pan, Oil Pump, Oxygen Sensor, Parts, Radiator, Restoration Service, Shocks & Struts, Spark Plugs, Starter, Thermostat, Timing Belt, Tune-Up, Water Pump, Window M
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Acura, Aston Martin, Audi, Auto Clutch, Auto Drivetrain, Auto Engine, Auto, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Diesel Engine, Dodge, Exotic Car, Fiat, Ford, GMC, Harley Davidson, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Motorcycle/ATV, Nissan, Oldsmobile, Pontiac, Porsche, RV/Bus, Saab, Saturn, Small Engine, Subaru, Toyota, Truck, Volkswagen, Volvo

Mechanic and Home Roofing
(904) 323-4182
1212 Steele Court
Jacksonville, FL
Hours
Monday 9:00 AM - 5:00 PM
Tuesday 9:00 AM - 5:00 PM
Wednesday 9:00 AM - 5:00 PM
Thursday 9:00 AM - 5:00 PM
Friday 9:00 AM - 5:00 PM
Saturday Closed
Sunday Closed
Services
Air Conditioning/Heating, Alignment, Alternator, Battery, Belts & Hoses, Catalytic Converter, Clutch Cylinder, Cooling System, Diagnostics, Drive Belt, Electrical System, Exhaust Systems, Filters & Fluids, Fuel Injector, Fuel Pump, Fuel System, Head Gasket, Headlight/Headlamp, High Performance Service, Ignition, Inspection, Muffler, Oil Pan, Oil Pump, Oxygen Sensor, Parts, Radiator, Restoration Service, Shocks & Struts, Spark Plugs, Starter, Thermostat, Timing Belt, Tune-Up, Water Pump, Window M
Service Types and Repair
Acura, Aston Martin, Audi, Auto Clutch, Auto Drivetrain, Auto Engine, Auto Interior, Auto, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Diesel Engine, Dodge, Emergency Auto, Exotic Car, Fiat, Ford, GMC, Harley Davidson, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Motorcycle/ATV, Nissan, Oldsmobile, Pontiac, Porsche, RV/Bus, Saab, Saturn, Small Engine, Subaru, Suzuki, Toyota, Truck, Volkswagen, Volvo

24 Seven Tech Inc
(904) 469-0936
6376 Greenland Rd
Jacksonville, FL
Hours
Monday 24 Hours
Tuesday 24 Hours
Wednesday 24 Hours
Thursday 24 Hours
Friday 24 Hours
Saturday 24 Hours
Sunday 24 Hours
Memberships and Certifications
Certifications : BBB Certified
Services
Air Conditioning/Heating, Alignment, Alternator, Battery, Belts & Hoses, Catalytic Converter, Clutch Cylinder, Cooling System, Diagnostics, Drive Belt, Electrical System, Exhaust Systems, Filters & Fluids, Fuel Injector, Fuel Pump, Fuel System, Head Gasket, Headlight/Headlamp, High Performance Service, Ignition, Inspection, Muffler, Oil Pan, Oil Pump, Oxygen Sensor, Parts, Radiator, Restoration Service, Shocks & Struts, Spark Plugs, Starter, Thermostat, Timing Belt, Tune-Up, Water Pump, Window M
Service Types and Repair
Acura, Aston Martin, Audi, Auto Clutch, Auto Drivetrain, Auto Engine, Auto Interior, Auto, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Diesel Engine, Dodge, Emergency Auto, Exotic Car, Fiat, Ford, GMC, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Nissan, Oldsmobile, Pontiac, Porsche, RV/Bus, Saab, Saturn, Small Engine, Subaru, Suzuki, Toyota, Truck, Volkswagen, Volvo

Auto Truck Transmission
(904) 745-6106
5804 Arlington Rd
Jacksonville, FL
Services
Auto Service & Repair, Trucks Service & Repair, Auto Transmissions, Truck Transmissions Retail, Auto Service & Repair Consultants

Auto Connection
(904) 388-8588
5404 San Juan Avenue
Jacksonville, FL
Services
Auto Service & Repair, Brakes Service & Repair

Quality Tire & Auto Service, Inc
(904) 404-9805
4407 Brentwood Ave
Jacksonville, FL
Hours
Monday 8:00 AM - 5:00 PM
Tuesday 8:00 AM - 5:00 PM
Wednesday 8:00 AM - 5:00 PM
Thursday 8:00 AM - 5:00 PM
Friday 8:00 AM - 5:00 PM
Saturday 8:00 AM - 5:00 PM
Sunday Closed
Memberships and Certifications
Certifications : ASE
Services
Air Conditioning/Heating, Alignment, Alternator, Battery, Belts & Hoses, Catalytic Converter, Clutch Cylinder, Cooling System, Diagnostics, Drive Belt, Electrical System, Exhaust Systems, Filters & Fluids, Fuel Injector, Fuel Pump, Fuel System, Head Gasket, Headlight/Headlamp, High Performance Service, Ignition, Inspection, Muffler, Oil Pan, Oil Pump, Oxygen Sensor, Parts, Radiator, Restoration Service, Shocks & Struts, Spark Plugs, Starter, Thermostat, Timing Belt, Tune-Up, Water Pump, Window M
Service Types and Repair
Acura, Aston Martin, Audi, Auto Clutch, Auto Drivetrain, Auto Engine, Auto Interior, Auto, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Diesel Engine, Dodge, Emergency Auto, Exotic Car, Fiat, Ford, GMC, Harley Davidson, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Motorcycle/ATV, Nissan, Oldsmobile, Pontiac, Porsche, RV/Bus, Saab, Saturn, Small Engine, Subaru, Suzuki, Toyota, Truck, Volkswagen, Volvo

Red Striped Automotive Llc
(904) 438-8661
8466 New York Ave
Jacksonville, FL
Hours
Monday 9:00 AM - 6:00 PM
Tuesday 9:00 AM - 6:00 PM
Wednesday 9:00 AM - 6:00 PM
Thursday 9:00 AM - 6:00 PM
Friday 9:00 AM - 6:00 PM
Saturday Closed
Sunday Closed
Services
Air Conditioning/Heating, Alignment, Alternator, Battery, Belts & Hoses, Catalytic Converter, Clutch Cylinder, Cooling System, Diagnostics, Drive Belt, Electrical System, Exhaust Systems, Filters & Fluids, Fuel Injector, Fuel Pump, Fuel System, Head Gasket, Headlight/Headlamp, High Performance Service, Ignition, Inspection, Muffler, Oil Pan, Oil Pump, Oxygen Sensor, Parts, Radiator, Restoration Service, Shocks & Struts, Spark Plugs, Starter, Thermostat, Timing Belt, Tune-Up, Water Pump, Window M
Service Types and Repair
Acura, Aston Martin, Audi, Auto Clutch, Auto Drivetrain, Auto Engine, Auto Interior, Auto, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Diesel Engine, Dodge, Emergency Auto, Exotic Car, Fiat, Ford, GMC, Harley Davidson, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Motorcycle/ATV, Nissan, Oldsmobile, Pontiac, Porsche, RV/Bus, Saab, Saturn, Small Engine, Subaru, Suzuki, Toyota, Truck, Volkswagen, Volvo

BooBoo's Automotive, RV, Tire & Towing
(904) 739-0063
6299-9 Powers Avenue%2C Suite 244
Jacksonville, FL
Services
Auto Service & Repair, Mobile Auto Service & Repair, Auto Oil & Lube, Brakes Service & Repair, Wheels & Tires Service & Repair
Hours
Mon-Fri: 08: 00 AM-05: 00 PM
Sat 08: 00 AM-12: 00 PM
Payment Options
American Express, MasterCard, VISA, Debit Cards, Discover, Personal Checks,

Drive Line Service of Jacksonville
(904) 783-4490
200 Lane Avenue North
Jacksonville, FL
Services
Auto Service & Repair, Auto Parts Retail, Drive Shafts, Truck Parts & Equipment Wholesale & Manufacturers
Products
Axles, CV Joints, Boots, Auto, Car, Truck, Marine, Rebuilt, CV Axles

Banta Auto Repair & Electric
(904) 642-2231
1718 Saint Johns Bluff Road South%2C %231
Jacksonville, FL
Services
Auto Service & Repair, Auto Diagnostic Services, Auto Electrical Systems Service & Repair, Mufflers & Exhaust Systems Service & Repair

Car Engine Misfires

Provided by:

Reader Question Hi, I'd just like to thank in advance for any help you can offer. I own a 91 Mustang GT, with a very modified 5.0 motor. It has aftermarket heads, cam, intake, injectors, mass air meter, etc...I could list parts for hours.

The car has a persistent misfire at part-throttle that seems to be getting worse. The car will start breaking up, audible through the exhaust, and buck and jerk violently. Heavier throttle inputs (not WOT) will usually be met with a bogging-down and heavy loss of power, occasionally an exhaust backfire, and then a normal, hard pull after anywhere from 2-5 seconds. The camshaft I run has a lot of overlap, but the driveability problems posed by the camshaft clear up at approximately 1600 rpms, beyond this range, the misfire becomes very noticeable.

It clears up completely at wide open throttle, and runs excellently, but anything less than wide-open presents me with problems. The plugs are not fouling but look to be lean (very white), but when I add fuel, the problems do not disappear and in fact get worse, as the backfires get more prevalent.

Plugwires are brand new and have shown no effect replacing them, as with the cap and rotor, TFI ignition module, and ignition coil. I have taken the aftermarket CD ignition box out of the loop as well to no effect. Base timing is 5 degrees above stock, in an appropriate range, with no detonation present, and I have adjusted all of the rockers arms to spec (aftermarket adjustables, not factory bolt-downs)

I have gone over the motor and have no vacuum leaks that I can find, the motor holds a steady 9 inches of vacuum. TPS voltage is within spec at idle, and produces a smooth sweep up to peak voltage, which is also within spec. Mass air meter and injectors are aftermarket, and the meter has been calibrated to the injector size. EGR system is totally disabled and block off, as the heads have no EGR passageways. There is also no smog pump, EVAP return (purge solenoid disconnected, purge line left to vent to atmosphere), and no catalytic converters.

I get no check-engine light but have scanned for stored codes and find O2 lean codes for both banks, but the light is never tripped. Air:fuel ratio has been confirmed as 13.0:1 at wide open throttle, but has not been checked at part throttle.

I'm sure this is a lot more complicated than the questions you usually get so I understand if I don't get a reply back, but I figured I'd ask. Thanks again, I've just been trying to track this problem down for 6 months and am honestly stumped and can't afford to just 'throw parts at it'. Every mechanic that's looked at it has been stumped as well.

-Brooks

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