Skip the auto shop - Our mechanics make house calls

Q: Rough Idle

asked by on

My fiancee's 02 galant es with a 2.4L is idling really rough and getting hard to start. It will try to crank then after a couple tries it finally does. Once it starts is idles really rough. I've replaced the IAC and the TPS what else could this possibly be causing this ?

My car has 137000 miles.
My car has an automatic transmission.

A: This may also be caused by other things suc...

This may also be caused by other things such as low fuel pressure or leaking or intermittently working fuel injectors. When the fuel pressure is low, it will fail to bring the correct amount of fuel pressure to the injectors causing a lean fuel condition which may cause a rough idle. The same is true when the injectors are dirty or do not have the proper voltage running to them. To avoid any unnecessary repairs, I would recommend having an expert from YourMechanic come to your location to diagnose your rough idle firsthand. Best of luck.

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・Save up to 30%

Get a quote

What others are asking

Q: Jumps from drive to neutral

The most straightforward possibility here is that the transmission range sensor and the shift linkage itself are misaligned. The range sensor provides an electronic "here's the gear I am in" to the transmission controller, and other interested electronic components. The...

Q: AC drain is blocked

Hi there. There are two reasons why there would be water accumulating on your passenger side carpet. One reason would be your AC compressor's condensation drain is clogged. Another possible reason can be that your heater core may be leaking...

Q: Engine not getting gas properly.

Hi, this is a common mistake people make when putting a fuel pump on. They forget to change the fuel filter. A clogged fuel filter may be what caused the pump to go bad. I would have a technician such...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...