My cars been giving me a cylinder #3 missfire and its running great no missfire i feel... how is it detected to the ECU, maybe a sencors going bad??

Tony

 

There is a crank fluctuation sensor on the OBD2 cars. It's located on the oil pump, and it detects small changes in the engine speed, way below what you can feel. For misfires, suspect the ignition system first. Assuming you don't just have a bad tank of fuel, make sure all igntion parts are OEM in good condition. This includes plugs, wires, distributor cap and rotor.

 

You can also check the valve lash adjustment. Too tight can cause a misfire at low RPM. Bent valves also have the same effect. You won't have bent valves unless you misshifted and overreved the engine. Fuel injectors are also suspect.


Modified by Dogginator at 10:00 PM 3/8/2006

 

no, he is right. US obd2 cars have the sensor located on the oil pump and read off the crank gear. more accurate pickup.

 

You guys are correct. I like learning stuff.

 

thanx-ill check it out!!

 

also u can get resistance between injector to see if its fuel misfire if resistance is the saem across all injector or within specs then look at mechanical probelms or electrical like ur ignition system liek they said earlier

 

Well after some $$ and time... i think i have a bad injector on my hands... GAY!! anyone kno where i can get one

 

What is wrong with the injector? Is it clogged, leaking, or spraying erratically? You may want to try some fuel injector cleaner. These can also be cleaned, but used replacements are probably cheaper. If you need new ones, try the classifieds.