Skip the auto shop - Our mechanics make house calls

Q: rough idle

asked by on

it doesnt want to idle when its first started when the motor is cold, then after it warms up it will idle it will idle but a rough idle and when im sitting still its loping, like its getting to much gas and i also smell gas. i have already changed the spark plugs and spark plug wires and the filter is good.
My car has an automatic transmission.

These engines had a bad problem of getting excessive carbon build up on the valves that causes this problem. You may need to have the intake system cleaned out more than once using a combustion chamber cleaner. Be sure to clean the fuel injectors as well. Once this is done, the fuel pressure should be checked to make sure it is correct and not leaking. If it is, then it may be a defective pressure regulator. I’d suggest getting some assistance with this by having a certified technician, such as one from Yourmechanic, to help diagnose your rough idle and fix it accordingly.

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: 1990 ford ranger front rotor removal

If your model has manual or automatic locking hubs, to remove the front rotors, the Mechanic has to follow the procedure for wheel bearing removal in the Factory Service Manual. If you desire to hire a certified Mechanic to perform...

Q: The durango runs very rough after a loud pop.

This can happen for many reasons, however usually a loud pop or backfire is a sign of a lean fuel condition or an ignition timing problem. A lean fuel condition can be caused by a faulty mass air flow sensor...

Q: How do I create a MyKey?

You can create a MyKey with just a few steps: 1. Press the Up/Down buttons on the steering wheel until Settings is displayed on the instrument panel, then press the OK button. 2. Press the Up/Down buttons until MyKey is...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...