Emmission light (looks like mini-motor) came on two weeks ago. Took in and they said a fuel injector was blocked. Serviced injectors and light went off.
Two weeks later same light appeared again. With second use with light on the battery light light as well. Drove right to shop. They said when they ran the computer diagnostic it indicated an oxygen sensor but that the alternator was defective / burned out.
The mechanic seems like a really good guy they said they haven't figured it out fully but think there is an electrical problem. Not sure if oxygen sensor burned out alternator or alternator tirggered oxygen sesor or if something else is going on. Any suggestions? Have you heard of this before?
An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert who has written 20 answers of more than 400 characters.
An expert who has answered 20 questions.
Re: engine / emission light and burned out alternator
Lose drive belt, lose connection,both can cause a low charge ,and cause the light to come on. never heard of oxygen sensor,burning out the altenator,maybe a short,or an electrical ark caused by short?(check fuses, and links?)
Re: engine / emission light and burned out alternator
Oxygen sensor might be faulty, as it causes the light to come on, but injectors hardly causes the light to come on, alternator( battery) light is an indication that the alternator needs to be replaced.
- 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.
Is the car engine turning/ swinging when the key is turned. If the engine is cranking then look at the distributor and the spark plugs and engine timing also it is worth a look at the fuel pump and supply to the injectors there should be a valve similar to the wheel valve on the injector bank press the valve with key on you should see fuel spurt out under pressure as the pump will be keeping the injectors under pressure . If the car is not cranking then look at the starter.
You already took #1 off the list. The national auto parts chains (AutoZone, Pep Boys, and Advance Auto Parts) will hook up a diagnostic tool to your car to perform a Charging System diagnosis for free - its an easy way to exonerate & differentially diagnose your Alternator/Battery/Voltage Regulator.
Priority Action Part Type Cause 1 Inspect Battery Battery Discharged or Faulty. 2 Inspect Battery Cable Corroded, Broken, Shorted or Poorly Connected Battery Cable. 3 Inspect Fuel Filter Clogged or Dirty Fuel Filter. 4 Inspect Distributor Cap Distributor Cap Cracked or Burned contacts. 5 Inspect Coil - Ignition Faulty Ignition Coil. 6 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s). 7 Inspect Spark Plug Incorrectly Gapped or Fouled Spark Plug(s). 8 Inspect Starter Starter Motor Faulty. 9 Inspect Fuel Pump Low Fuel Pressure. 10 Inspect Solenoid Switch Faulty Starter Solenoid Switch. 11 Inspect Relay - Fuel Pump Faulty Fuel Pump Relay. 12 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator. 13 Inspect Ignition Switch Improperly Connected or Faulty Ignition Switch. 14 Inspect Starter Motor Faulty Starter Motor. 15 Inspect Fuel Injector Dirty or Worn Fuel Injectors. 16 Inspect Fuel Pump Strainer Clogged or Dirty Fuel Pump Strainerat. 17 Inspect Engine Control Computer Incorrect Operating Information Being Delivered and Sent From The ECC. 18 Inspect Fuel Tank Fuel Tank Empty. 19 Inspect Carburetor Carburetor Flooded or Faulty Choke. 20 Inspect Distributor Worn, Loose, or Incorrectly Installed Distributor. 21 Inspect Distributor Rotor Burned Distributor Rotor contact
Had the same thing happen 2 years ago when it started 80 miles from home when i took off from a red light it didnt want to go pouring white raw fuel smoke i bet it took 5 miles to get up to a speed where i wasnt getting run over we finally got it home and it was the bearings gone in the turbo.
It's normal for the cat to get hot - given they've replaced everything (just about) that could cause your problem - they have not looked at the injectors and O2 sensors. If you had something burning in the engine bay it was most likely electrical and you should look for burnt wires. You probably have a short in the ignition system or fuel injector wire harness. It's nearly impossible to diag a problem like this without having the car first hand. It must be throwing check engine light codes. Get the codes and post them. Also try a different shop at this point.
there are many items that will cause your truck not to be clean
when you spark get weak it will not burn all the fuel and not set a code so a good ign tune up pluga and plug wires and related parts and a good injector cleaner. then you need to take it out for a long drive to clean out the system. i have seen many cars not pass just because of alot of idle time.
you didnt say how many miles are on this jeep or how long since a tune up?