Q: Loss of power with flashing engine light

asked by on July 18, 2017

When holding a speed of roughly 47-53 I get a consistent jerk like the engine is bogging down but I have no power loss and I receive no check engine light. If the jerking gets too violent then the engine immediately smooths itself out and a light comes on for one of my O2 sensors, probably just a lean misfire. What scares me is today it started acting where when holding 25-35 mph I get a huge loss of power and the tach bounces roughly +-800 rpm from where it was and the check engine light flashes until I am going slower than 25 or faster than 35. If I accelerate out of the speed zone I suddenly get all my power back in one jerk and once even got a loud metal on metal bang. The car sat in Florida for at least two months with the same tank of gas before I bought it and the previous owner did nothing but oil changes and air filters for maintenance so it's most likely the original spark plugs from 158k ago. The only things I can think of is plug misfire or gunked up injectors

My car has 158000 miles.
My car has an automatic transmission.

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Loss of power going uphill and acceleration issues on flat land

Hello. P0401 is the trouble code for insufficient EGR flow. This can occur for a few different reasons, and could be contributing to your performance issues. The EGR, short for exhaust gas re circulation, is a system designed to recirculate...

car starts, sputters, then dies

Hi there. First off, I strongly recommend NOT trying to clear codes by touching battery cables; as this is a quick way to fry the ECU as well. It is very possible that this action may have triggered your limp...

Spark Plug Socket size and extension bar

Depending on your preference I would recommend a spark plug socket 5/8 with at least a 8 to 10 inch extension. Get the locking type of extension to lock to the socket so it will not get stuck on the...

Related articles

Chrysler Certified Pre-Owned (CPO) Car Program
If If you are shopping for a used Chrysler vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on to...
How to Get Chrysler Dealership Certified
Chrysler car dealerships offer automotive technician jobs to mechanics who are certified through the MOPAR CAP (Career Automotive Program).
Understanding the Chrysler Oil Change Indicator and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Chrysler Oil Change Indicator lets you know when and what service your car needs.