Possible defective electrical connector on the fuel injector due to corrosion of the terminals or pushed out pins Dirty or clogged fuel injector Fuel injector failure
Check for voltage at the injector plug while engine is running, if no voltage present, trace wiring. In voltage is present, check ot replace injector.
Possible defective electrical connector on the fuel injector due to corrosion of the terminals or pushed out pins Dirty or clogged fuel injector Fuel injector failure
Check for voltage at the injector plug while engine is running, if no voltage present, trace wiring. In voltage is present, check ot replace injector. Have you checked ignition coil for #3 cylinder?
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SOURCE: Misfire
One question, have you replaced the ECTS (Electronic Cooling Temperature Sensor)? These cause no end of different seemingly unrelated problems on Saturns. Peice is about ten bucks and is an easy install. Just search on youtube for a how-to video. Even if that's not the problem it is reccommended to replace this peice just the same as they ALL end up going bad at some point.
If that's not a fix, start pulling plugs. Check to see if they're correctly gapped and if they have any damage/corrosion. If you're running Platinum plugs, immediatly change to a copper plug as Platinums have no place in these motors. Most people have the best luck with NGK copper.
Check to make sure that your plug wires haven't been crossed. This sounds like a plug or wire issue most likely so it has to be in that family, if the plugs are good, wires good and not crossed, sensors are fine, then time to replace your coil packs. If you've replaced everything up to the coil packs then that is most likely the cause of your dillema.
SOURCE: 2004 Jeep G Cherokee diagnostic code open injector
It could be a faulty pcm or wiring as you stated in you post. the pcm pulses a ground to the injector circuit allowing the solenoid in the injector to activate momentarily are inject fuel into the intake. if you give me the engine size. V8 4.7L or strait 6 cylinder 4.0L and i will post the proper wiring diagram for the fuel injectors to help you out with your battle
SOURCE: engine code p0307 cylinder #7 misfire
It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.
SOURCE: reset check engine light in a 2004 Kia Sorento
usually you can reset a check engine light buy disconnecting the battery for about 30 minutes.
SOURCE: 2000 Kia Sephia p0303 code engine misfires
do a compression test. cylinder 3 could have a bad valve lifter or valve.kia sephia dont have push rods.it have a bucket type followers.a intake leak to that cylinder can also cause misfire problems.
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