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Car Engine Misfires Waldorf MD

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

Boswell's Auto Service
(301) 965-0992
4 Irongate Drive
Waldorf, MD
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 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
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

Action Auto Body of Alexandria
(571) 732-3783
2402 Oakville St
Alexandria, VA
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 Closed
Sunday Closed
Services
Alignments, Body Shops, Detailing, Painting, Rustproofing, Custom Work, Paintless Dent Removal, Pre Purchase Inspections, Welding
Service Types and Repair
Acura, Aston Martin, Audi, Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Glass, Auto Unibody, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Collision, Dent, Dodge, Exotic Car, Fiat, Fleet, Ford, GMC, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Nissan, Oldsmobile, Pontiac, Porsche, Post Inspections, Saab, Saturn, Subaru, Suspension, Suzuki, Towing, Toyota, Volkswagen, Volvo, Wheel and Reconditioning

Spring Mall Auto Body
(703) 988-7264
7708 Back Lick Road
Springfield, VA
Hours
Monday 7:30 AM - 5:30 PM
Tuesday 7:30 AM - 5:30 PM
Wednesday 7:30 AM - 5:30 PM
Thursday 7:30 AM - 5:30 PM
Friday 7:30 AM - 5:30 PM
Saturday Closed
Sunday Closed
Services
Alignments, Body Shops, Detailing, Painting, Rustproofing, Custom Work, Paintless Dent Removal, Pre Purchase Inspections, Welding
Service Types and Repair
Acura, Aston Martin, Audi, Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Glass, Auto Unibody, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Collision, Dent, Dodge, Exotic Car, Fiat, Fleet, Ford, GMC, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Nissan, Oldsmobile, Pontiac, Porsche, Post Inspections, Saab, Saturn, Subaru, Suspension, Suzuki, Towing, Toyota, Volkswagen, Volvo, Wheel and Reconditioning

Extreme Custom Collision
(703) 594-1997
1340 Profit Ct
Woodbridge, VA
Hours
Monday 8:00 AM - 5:30 PM
Tuesday 8:00 AM - 5:30 PM
Wednesday 8:00 AM - 5:30 PM
Thursday 8:00 AM - 5:30 PM
Friday 8:00 AM - 5:30 PM
Saturday Closed
Sunday Closed
Services
Body Shops, Detailing, Painting, Rustproofing, Custom Work, Paintless Dent Removal, Pre Purchase Inspections, Welding
Service Types and Repair
Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Glass, Auto Unibody, Collision, Dent, Post Inspections, Wheel and Reconditioning

The Maryland-National Capital Park & Planning Comm
(301) 780-2402, 001-2004
4200 Ritchie Marlboro Road
Upper Marlboro, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
Action Auto Body of Forestville
(301) 679-0483
7970 Penn Randall Place
Upper Marlboro, MD
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 Closed
Sunday Closed
Services
Alignments, Body Shops, Detailing, Painting, Rustproofing, Custom Work, Paintless Dent Removal, Pre Purchase Inspections, Welding
Service Types and Repair
Acura, Aston Martin, Audi, Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Glass, Auto Unibody, Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Classic Car, Collision, Dent, Dodge, Exotic Car, Fiat, Fleet, Ford, GMC, Honda, Hyundai, Infiniti, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Lincoln, Lotus, Mazda, Mercedes Benz, Mitsubishi, Nissan, Oldsmobile, Pontiac, Porsche, Post Inspections, Saab, Saturn, Subaru, Suspension, Suzuki, Towing, Toyota, Volkswagen, Volvo, Wheel and Reconditioning

Maaco - Capitol Heights
(301) 836-1670
111 Westhampton Ave
Capitol Heights, MD
Hours
Monday 7:30 AM - 6:00 PM
Tuesday 7:30 AM - 6:00 PM
Wednesday 7:30 AM - 6:00 PM
Thursday 7:30 AM - 6:00 PM
Friday 7:30 AM - 6:00 PM
Saturday 9:00 AM - 12:00 PM
Sunday Closed
Services
Body Shops, Detailing, Painting, Custom Work, Welding
Service Types and Repair
Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Unibody, Collision, Dent, Fleet

Wonder Automotive Inc
(202) 769-5502
1111 Bladensburg Rd NE
Washington, DC
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

Hollin Hall Automotive
(703) 765-3722, 001-2004
7926 Fort Hunt Road
Alexandria, VA
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
Oakcrest Auto Body Inc.
(301) 736-5200, 001-2004
5410 Marlboro Pike
Forestville, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
Data Provided by:

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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