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HELLO I HAVE A 96 SUBURBAN THAT HAS A CODE READING P0302. #2 CYLINDER MISFIRE. IS IT ANY ONE OUT THERE WHO CAN TELL ME WHAT TO DO TO FIX THIS PROBLEM. I GOT THE TRUCK 3 WEEKS AGO AND IT NEEDS TO PASS INSPECTION VERY SOON. PLEASE HELP.
U must find the cause of the miss-fire, there is no magic fix just rigorous testing of ignition, fuel, and engine.U must find the cause of the miss-fire, there is no magic fix just rigorous testing of ignition, fuel, and engine.
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P0302 is a mechanical fault code meaning there could be a problem with the wiring or ignition/fuel system, could be a bad injector or ECT/MAF sensor or the ECM. (ECT=engine coolant temperature sensor)(MAF=Air flow sensor)(ECM=Engine control Module)
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A flashing cel indicates misfiring. A common problem is a bad ignition coil. The easiest route for diagnosis is the check the trouble codes(autozone and some other parts stores will scan for free, or an OBDII code reader is not too expensive to buy). The code should tell you which cylinder is misfiring(PO301 means cyl #1, 302 cyl #2, etc). Once you know which it is, swap the ignition coils around. If you have a #1 misfire, swap coils 1 and 4, clear the codes, then check it again. If the misfire moves, you know you've got a bad coil. If the misfire is air or fuel related, as with an intake leak, other codes should come up as well as the misfire.
Sounds like you have cylinder misfire. Any of the large auto parts stores can run an OBDII check and tell you which cylinder is misfiring (not firing). The engine is running with one cylinder out causing the rough idle. The faster the car goes the less perceptible the misfire is. That is why at 30mph the car seems to run smooth.
The 305 code means a cylinder misfire. You could have a bad valve or a cracked cylinder head (worst case). Rent a compression tester from any auto parts store that does the tool loan program and test your compression. If ALL your cylinders are within 20% of each other, then I would check your injector pressure. I hope its something simple and cheap to repair.
You may need to look at your exhaust system. If you have a leak, your O2 sensors will send the wrong reading to your engine which will in turn tell your engine to fire differently. Your code will come up reading as a misfired bank. See if you have an exhaust leak first, then see about changing out the O2 sensors behind the leak.
95 toyota may have an early obd2 diagnostics,which started for all cars in 96,which means it can track a cylinder misfire,when ck light flashes it can mean multiple misfire detected causing serious loss of power,you can try going to autozone they do free ck engine light code reading ,tell them you may have obd2 plug according to web,let me know codes if you get lucky.with AZ its hit or miss
Hello I need a help. I have 1999 lincoln town car 4.6L V8.They have check engine light on. P 0303 cylinder 3 missfire. I was changed spark plugs,fuel filter. check compression test 150psi. fuel pressuer 50. swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code
U must find the cause of the miss-fire, there is no magic fix just rigorous testing of ignition, fuel, and engine.
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