Q: Rough idle and no power - 2004 Ford Ranger

asked by on

I replaced the ignition coil and still does the same thing, hard to start and no power, 2 cylinders are not firing ?

My car has 136000 miles.
My car has an automatic transmission.

Hi and thanks for contacting YourMechanic. Check the spark plugs and plug wires to the cylinders. Make sure that there is spark to the plugs.

If there is no spark to the plugs, then check the harness to the ignition coil for battery voltage. If there is no voltage, then check for any blown fuses. If the harness is good and the fuses are good and there is a good spark, then check the fuel injectors to the two cylinders. Check for voltage on the harness to the fuel injectors.

If there is voltage, then I recommend switching the injectors around to see if the problem changes to another cylinder. If the problem changes, then replace the injectors. If the problem does not change, then the cylinders have a problem internally. Check for compression and perform a leak down test to determine the condition of the cylinders. If you need further assistance diagnosing your engine, then seek out a professional, such as one from YourMechanic, to help diagnose the loss of power problem and assist with repairs.

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
  1. Home
  2. Questions
  3. Rough idle and no power - 2004 Ford Ranger

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: The dealer is telling me I have to replace the seat rail in my ford edge because they don't manufacture parts to repair the proble

Hello. If the gears inside the tilting mechanism are broken off, the motor may run, but the seat will not move. While most of these parts can be sold and replaced separately, not all parts are serviceable. If the part...

Q: Oil cooler replacement

You could have the oil cooler cleaned off with brake cleaner first then dried. After this, then add oil leak detector dye to the engine oil and then drive vehicle a few days and check for oil leaks with a...

Q: Best water pump or "good enough"? 2004 Porsche Boxster S

Hi - there is a certain value from the buyers point of view in being to able say you "only used OEM parts" - and I don't mean necessarily ones that came in a Porsche box. Pierburg is an OEM...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.