My car was running on 3 cylinders. Had a bad wire. I replaced the plugs (gap at .050) and the wires. I also replaced the air filter. My car wont idle and has no power when taking off from a stop light. I checked for a vacuum leak. All hoses looked fine. any help would be greatly appreciated.
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replace fuel filter, clean fuel injectors.could have bad fuel, do a code scan before buying new parts.faulty egr valve or faulty engine coolant temperature sensor cause engine run poorly.replace spark plugs and wires because if spark plug wires is bad or spark plug and ignition coil is bad that will cause rough idling misfiring and stalling you have dead cylinder not firing properly..
303 IS CYLINDER #3 WITCH IS REAR BANK IN THE MIDDLE, TRY SWAPPING SPARK PLUG WIRES WITH ANOTHER CYLINDER AND SEE IF YOU GET ANOTHER CODE. MAKE SURE PLUGS ARE GAPPED CORRECTLY. IF IT IS NOT A SPARK PLUG OR WIRE, SUSPECT A BAD INJECTOR. 301-306 IS CYL,1-6. ALSO MAKE SURE THE PLUG WIRE GOT BACK ON THE PLUG CORRECTLY THEY ARE HARD TO REACH AND YOU MAY HAVE MISSED THE SPARK PLUG WHEN YOU PUT THE WIRE ON.
Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.
Loss of spark includes anything that
prevents coil voltage from jumping the electrode gap at the end of the
spark plug. Causes include worn, fouled or damaged spark plugs, bad wires
or even a cracked distributor cap. A weak coil or excessive rotor gas
inside a distributor would affect all cylinders, not just a single
"Lean misfire" can occur when the air/fuel
mixture is too lean (not enough gasoline in the mixture) to burn. This
can be caused by a dirty, clogged or inoperative fuel injector; air
leaks; or low fuel pressure because of a weak pump, restricted filter
or leaky pressure regulator.
Loss of compression means the cylinder
loses most of its air/fuel mixture before it can be ignited. The most
likely causes here are a leaky (burned) exhaust valve or a blown head
gasket. If two adjacent cylinders are misfiring, it's likely the head
gasket between them has failed. Also, if an engine is overheating or
losing coolant, it's likely the head gasket is the culprit.
You can isolate the weak cylinder by temporarily disconnecting each of the spark
plug wires, one at a time, while the engine is idling. When there's no
change in the idle speed, then you have pinpointed the weak cylinder.
here are the common causes of a missfire, defective ignition coil or ignition coil wiring for that cylinder, defective fuel injector, defective powertrain control module, intake manifold vacuum leak, low cylinder compression.
change plug and wire if its been a while most cars have 90000 miles platinum plugs in them.but the wires wear before plugs.so change plugs and wires.+clean fuel injectors .change fuel filter and air filter.if car still run rough your idling to low.have idling check .
Ok, there are four problem spots that i recommend inspecting the first would be the air filter.
The air filter may be clogged or dirty. this can decrease the power out put and it can also affect the idle as well. the next check point would be inspecting the spark plugs. make sue the plugs are correctly gapped and are not fouled in anyway. if they are fouled or incorrectly gapped, this will cause the symptoms you are experiencing at this time. Another check point will be the wire set(spark plug wires). make sure the wires are in good condition. remove all wires from the plugs and look inside the wire head t inspect the contacts. they should be nice and clean.if the wires are worn, replace them accordingly. the final check point will be checking the PCV valve. this valve is located Under hood, center, upper engine area, top of engine,
mounted in valve cover. the testing procedure to be preformed on this specific device is stated below.
PCV VALVE TESTING PROCEDURE---
# Check the ventilation hoses and lines for leaks or clogging. Clean or replace as necessary.
# Locate the PCV valve in the cylinder head cover and remove it by pulling it upward.
# Blow into the crankcase end of the valve. There should be free passage of air through the valve.
# Blow into the intake manifold end of the valve. There should be little or no passage of air through the valve.
# If the PCV valve failed either of the preceding two checks, it will require replacement.
You will find the problem for you erratic or low idle in the areas above.
As Long as You ABSOLUTLY POSITIVE the Timing is Dead on , And Plyg WIRES are Not Crossed Then Hate to tell you It Must Have Taped a valve. Start it up and Let it Idle Take The Plug wires OFF 1 By 1 And Listen for NO DIFFERANCE in the IDLE the ones that Make NO Differance are the Bad Cylinders for LUCKS SAKE Check the Gap on the Spark Plug of Effected Cylinders and as I said Make sure the Spark Plug Wires are not Crossed. Hope it turns Out Good For Ya I Have Been there done that on My Personal Car I Feel your Worrie. Please Show some Care and Rate Me For This Solution Although its Not Potentualy the Best Outcome, Again I Hope for YOU Its A OOps as Aposed to a OUCH for ya, Easy, RejakWilson