Skip the auto shop - Our mechanics make house calls

Q: Engine running rough and light now on.

asked by on

Engine initially started running rough on up hill acceleration (felt like ruts in road), then engine light came on (code tested manually crank x3 with no error), and now running rough in flat conditions. Vehicle purchased 2 mths ago from dealership who was to have inspected for resale/replaced alternator. EGR valve had been replaced in April, and after purchase on trip through hilly conditions engine light/EGR code came up again and found quite dirty so cleaned it [tests okay now] as well as sticky throttle body which dealer replaced. On purchase new champion plugs replaced with iridium ones and fuel injector cleaner added. Now on noted problem 90 Octane gas tried and just put in a fuel cleaner. Orig owner parked vehicle every winter (6 months) in garage and suspect fuel stabilizer was not used re EGR/throttle body issues. Initially was suspecting plugged fuel filter but questionable after reading symptoms on line (no start problems as yet). Possibilities/things to test?

My car has 65000 miles.

Yes you could have bad fuel in the system if that is the case. However, you may want to check and make sure your fuel filter is good, and make sure there are no extra leaks in the the air intake. Too much air will cause a problem with running. A local expert from YourMechanic can diagnose the rough running issue and Check Engine Light so that this can be corrected properly.

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

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: Parking brake warning

Be sure the warning light pertains only to the parking brake and not, in addition, the brake fluid level. If the warning light pertains only to the parking brake system, that system has a switch that could be sticking in...

Q: Internal engine noise

If you are hearing an engine noise, the best thing to do is to let an experienced mechanic listen to it to determine if it is coming from the internal, or external engine components. External problems could come from the...

Q: Why is it still misfiring?

Hi there. Check the Exhaust Gas Recirculation valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the engine....

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...
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...
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.