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?
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. Engine running rough and light now on.

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: ABS actuator to be replaced 2nd time in a year

Hello. There is no other permanent fix for this other than replacing it with a factory unit. Once it is replaced the connections and the grounds need to be checked. Also all of the wheel speed sensor signals need to...

Q: Engine light still on after replacing the gas cap

This is a simple fix. Replace the fuel cap. The cap sometimes does not reseal after refueling causing the system to detect a leak. Make sure the cap is sealing after you refuel and make sure the vehicle is turned...

Q: Check Engine Light and code for O2 sensor

Hello. Knowing the actual code number would help determine the problem. If you are getting an O2 sensor code associated with the way it is running, then the sensor is more than likely bad. On this Toyota, the O2 sensor...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...