I have a 2000 daewoo lanos check engine light either stays on or flashes intermittently, i have been told by the gargae it is a fautly o2 sensor, had all coil packs replaced and new spark plugs. sometimes it runs ok and then all of a sudden it runs lumpy (sounds like a tank) and looses power, but isnt stalling when idleing. i have just disconnected the o2 sensor by the fans, is it the o2 sensor that needs to be replaced. the garage cant seem to help and iam at my wits end to know what else to try!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
If your car is running rough and it's fuel injected (which yours is). Follow the air intake (black plastic box - housing the air filter that has tubing that goes to the motor) until it reaches the Throttle body (rounded metal air intake at the end of the plastic tube - has one large flap inside). You will want to remove the hose clamp and thoroughly clean the throttle body and the AIC (air idle control valve - small canister attached to the throttle body). Use off-the-shelf cleaner from any automotive store. This takes about 30mins to 1hr depending on your skill level. This will result in a cleaner smother idle and smoother performance. This is a common issue in today's cars. I have to do this once a yr to keep my modified car running happy.
Take a look at the later parts of this article for pictures to give you an idea:
more than likely u have a bad flasher. to use it in the meantime, do this: push the lever just enuff to see the arrow flashing (before it starts buzzing), then hesitate briefly and slowly move the lever into the full position. or if u prefer u can hold the lever at the flash until your turn is made.
check fuel filter and check fuel for water or contaminents
then check fuel pressure with gauge also while driving
may have pin hole in leads - spray water with salt solution over HT leads while engine running and then rev to see or here spark jump(missfire)
recheck spark plugs - did you crack any on installation/removal/installation?
what are the codes and description if stored?
what is engine live data parameters like do they look normal (right specs for range/operation)?
oil is non conductive so I doubt that's the problem, but the oil leak should be fixed to reduce problems down the road. as for the misfire could be a couple things, fouled plug(s), a plug wire(s) that has cracks, or even valves that are not seating which i doubt from your explanation. I would change your plugs and wires first, and fix oil leak. if this does not fix the issue there are other things going on.