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Car Engine Misfires Annapolis MD

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

Baltimore-Annapolis Truck & Trailer Service
(410) 846-2965
Serving Your Area
Annapolis, MD
Hours
Monday 24 Hours
Tuesday 24 Hours
Wednesday 24 Hours
Thursday 24 Hours
Friday 24 Hours
Saturday 24 Hours
Sunday 24 Hours
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

A A America
(410) 999-8608
7060 Aviation Blvd
Glen Burnie, MD
Promotion
Got in an accident? We specialize in returning your car to its pre-accident condition.

Mention this ad and get a free oil change with repair!
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
Body Shops, Paintless Dent Removal
Service Types and Repair
Acura, Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Unibody, Chevrolet, Chrysler, Collision, Dent, Dodge, Fiat, Ford, Honda, Hyundai, Jeep, Kia, Mazda, Nissan, Toyota, Volkswagen

Mamock's Motor Electric
(410) 267-7531
314 Legion Avenue
Annapolis, MD
Services
Auto Engines Service & Repair, Auto Service & Repair, Auto Electrical Systems Service & Repair, Auto Engine Rebuilding, Auto Alternators & Starters Service & Repair
Products
Alternators, Smokeless Oil, Axles, Factory Parts, Generators, Tires, Retreads,

Hartloves Auto
(410) 255-4466, 001-2004
8247 Baltimore & Annapolis Boulevard
Pasadena, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
Johnny's Auto Service
(301) 577-3140, 001-2004
9401 Smith Avenue
Lanham, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
A A America
(410) 881-5540
7535 Ritchie Highway
Glen Burnie, MD
Promotion
Got in an accident? We specialize in returning your car to its pre-accident condition.

Mention this ad and get a free oil change with repair!
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
Body Shops, Paintless Dent Removal
Service Types and Repair
Auto Aluminum, Auto Fiberglass, Auto Frame, Auto Unibody, Chevrolet, Chrysler, Collision, Dent, Dodge, Fiat, Ford, Honda, Hyundai, Jeep, Kia

Aamco of Baltimore
(410) 921-9508
5918 Ritchie Highway
Baltimore, 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 8:00 AM - 12:00 PM
Sunday Closed
Memberships and Certifications
Certifications : Aamco
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

Koons Toyota (Service Dept.)
(410) 268-6480, 001-2004
1107 West Street
Annapolis, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
Ken's Service & Tire Center
(410) 859-1644, 001-2004
1358 Dorsey Road
PO Box 860
Hanover, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

Data Provided by:
Goss' Garage
(301) 577-9200, 001-2004
9421 Smith Avenue
Seabrook, MD
Certifications
Blue Seal Certified
Membership Organizations
National Institute for Automotive Service Excellence (ASE)

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Car Engine Misfires

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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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