Skip the auto shop - Our mechanics make house calls

Q: No check engine light

asked by on

Replaced one coil 2 years ago. No pick up n go from dead stop. Sluggish. At 45 Mph, acceleration is hesitant and must back down or over accelerate to pick up speed. No Check Engine light at all. Need to know how to find coil or injector that is bad. I have no diagnostic equipment.

My car has 110000 miles.
My car has an automatic transmission.

A: Considering your symptoms, I would suspect ...

Considering your symptoms, I would suspect that your issue lies within the fuel or ignition system. Without diagnostic equipment, it would be best to have your vehicle inspected by a technician who does. Although you have no Check Engine Light, it is possible that the Check Engine Light may be burned out and that trouble codes could still be stored. I would first recommend having your vehicle scanned for trouble codes with an OBD2 scanner. This will help to determine which system or parts may be involved. If no codes exist, I would then recommend having the fuel pressure tested. If the fuel pressure is lower than factory specifications, the fuel pump or fuel filter may be close to the end of useful life. If the fuel pressure is within specification, I would then recommend having the ignition coils tested one by one with a spark tester to determine if any coils or spark plugs are malfunctioning. If you’d like assistance with these checks, consider YourMechanic, as a certified technician can perform the necessary tests to properly diagnose your acceleration issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Vehicle sputtering, hesitating and backfiring

When problems arise after a recent service, the best thing to do is go back and check all of the work. Mistakes do happen, and other parts can get bumped during a service. First, proper wire routing must be determined,...

Q: changing a reverse light bulb it the trunk lid of a 2003 impala ?

To change the lights, you'll have to remove the 8 or 10 wing nuts on the inside of the trunk lid holding in the rear light cover on. Remove the cover and the light bulbs are exposed so you can...

Q: Hi I have a 2007 DTS... Coulum shifter... Will slide through all the gears but won't come out of park and light never comes out of

There are quite a few possible causes for what you are describing. For example, in order to shift a vehicle out of park, you must step on the brake. If you have a faulty brake light switch, the shifter is...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...