Misfiring when accelerating at highway speeds in fifth gear
Happens at low revs, also rough idle.
Cleaned mass airflow sensor, trottle body, checked fuel pressure. Also did the obvious plugs , wires, and fuel filter.
tried high octane gas
The problems occured 3 days after putting fuel injector cleaner in the tank. Maybe this was just a coincidence?
Re: misfiring when accelerating at highway speeds in...
It could be a couple of things.
1) Check to make sure the wires are in the correct firing order.
2) Check to make sure th plugs are still good, including the gap.
If these don't work than you should probably have a mechanic look at it in person.
- 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.
Most common problem is a failed mass airflow sensor. Remove sensor and carefully inspect the sensor for debris building up on the diode. Another possibility is the egr valve may be partially stuck open. The upper intake manifold is made of plastic. The egr gases enter the intake just behind the throttle body inside the plastic intake. It is pretty common for the hot exhaust gases to burn through the plastic and possibly cause coolant to enter combustion chambers. A restricted catalytic convertor from previous engine misfires will accelerate this due to exhaust gases having no place to escape.
depending on mileage, but possible tune-up could fix it. if already done then check ignition coil pack and ignition wires also spark plugs, check vacuum hoses for leaks or porous, last injectors clogged - use some techron fuel injector cleaner (wal-mart has them). Also get the throttle body and iac valve cleaned by throttle cleaner .Also this other possibilities are to be checked and confirmed.:----Enginerunning rough or misfiring can be cause by the following: 1.Defectivespark
plugs 2.Inadequate spark/coil, defective spark plug
wire. 3. Lack ofcompression 4.False air leakage. 5. Faultyfuel injectors. 6. Insufficient fuel pressure. 7. Contaminated fuel. 8.EGR valvethat is leaking. 9. Oxygensensors. 10. Throttle position sensor. 11. Manifold absolutepressure
sensor 12.Mass Airflow Sensor 13.Idle air control valve ---------This should help.Keep updated.Thanks.Helpmech.
If it idles up and down real high, its the throttle body sensor. If it's a low up and down idle and runs rough it is mass air flow meter. If you unplug the mass airflow meter and it will just low idle (no up & down) then the mass air flow meter is bad.
You may want to check your Throttle body position sensor (TPS), and/or, the idle air sensor. This is the most common cause, and in some cases, if your car is acting funny more than at just idle, your Mass airflow sensor (MAF) could be fouling.
The injector could definitely trigger a misfire code, but you also mentioned that you had a mass airflow sensor code , that code code be responsible for te sluggish moment of the vehicle and rpm going up and down. However if you have a misfire onCyl#6 and the coil and the plug is good the ONLY other thing to cause a mis-fire would be the injector. To check the injector get a NOID light, you can get one at almost any auto-parts place. To use unplug injector plug from the bad injector and connect it to NOID light the light should have a steady PULSE/ligt flickering. If light flickers fine then injector is bad and will need to be replaced. If light doesn't flicker or flickers intermittently then you may have a bad wiring to that injector. Check if wiring is good, then you may have a bad cam sensor or sensor gear. Good Luck and contact if you need more help. Thanks for using FIX YA
Sounds to me like it could be a Mass Airflow Sensor issue. Or Air fuel mixture problem. Is the harness to the MAF and Trottle control sensors hooked up right? These are just simple solutions that may work. Check all of your fuses as well. One could be blown causeing you DLC not to operate. DLC =DATA LINK CONNECTOR. Find the fuse... read the code.... solve them problem! GOOD LUCK! hope this helps.
vacuum leak......bad tps.......bad mass airflow meter system........any of those are suspect...... also check for bad ground at battery to be sure all is not computer freak out from bad readings ...good luck