1997 2.2 CAVILIER REPLACED ALL WIRE PLUGS CAT FUEL FILTER AND ALL INJECTORS NOW MY ISSUE IS THE CAR WONT GO OVER 20MILES AN HOUR -I HAVE NOT CHECKED THE COILS OR CONTROL MODULE DO TO THE FACT IT HAS SPARK AND IT RAN GREAT FOR A DAY AFTER JUST REPLACING THE WIRES AND PLUGS IM AT A LOSS PLEASE ANY HELP THE MODULE COST A PRETTY PENNY AND ARE A PAIN IN THE REAR TO GET TO
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First the DTC P0304 is a misfire on number 4 cylinder which would be a sparkplug,plug wire,coil or a fuel injector and sense you've replaced three out of the four I would think you have a clogged or faulty injector.As for the DTC P0300 that is a random misfire detected which could co-inside with the bad injector.If it were me I would replace the injector and go from there and see if that fixes the problem.
usually this code is followed by another number 1-4 or 1-6 or 1-8 depending on how many cylinders your vehicle has ,, what the code you got is a basic
P0300 Random/Multiple Cylinder Misfire Detected A code P0300 may mean that one or more of the following has happened:
I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck ope
P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open
Causes: - Improper spark plug at cylinder #1 - Insufficient compression at cylinder #1 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #1 - Fuel injector #1 may be faulty - Intake air leak
In modern cars so much can go wrong to indicate an issue and a computer in the car can get confused as to what is really occurring. In most cars a misfire indicates either an incorrect firing order, shorted wires, bad plugs, or bad coil. Since you have replaced the wires and plugs we can rule those out. Im also assuming after the second engine code you pulled #2 plug and made sure it wasnt fouled with oil, was gapped correctly, and reinserted. To produce a sufficient spark for combustion the alternator sends power to a "Coil" which is in reality a storage point that then sends an amplified electrical current down the spark plug wire to the cylinder to fire the plug. If the car is truly misfiring you will notice a rough idle, fluctuating RPM's, and lack of acceleration. If you are experiencing any of these I would look at replacing the coil. If you arent experiencing any of these I would have the code cleared again and complete one drive cycle 100 miles and then have codes read again. If you still get a Misfire error some other causes known to occur with Rio's are fuel filter issues, gas caps, and fuel injector issues. Although rare, these can cause issues with the cars fuel delivery and emissions which can confuse the sensor in the ECU. I would try injector cleaner, replace the fuel filter, and gas cap . If funds are an issue then based on symptoms I would start with injector cleaner first $3, Filter $12, Gas cap $12, Coil $48 to $200+
Thank you for all the information. I don't see how you made it worse unless the injectors were not installed correctly. If you remove them you are suppose to replace the o-ring on each of them and oil them (the o-rings) before installing them. I would check the air filter and the CAT (for excessive back pressure. Also check the rest of the exhaust for damage. If a pipe is kinked or flattened it would need repair. Also GM's are known for some issues with there e-vap systems. You may want to check it out. The gas cap, charcoal canister, vacuum lines. Well good luck.
Hello, As you have probably already figured out , there are many things that can do this. here are some things you need to check. Ck fuel pressure. It should be between 41-47 lbs Ck coolant temp sensor. At operating temperature (194 degrees) it should be about 241 ohms, At 104 degrees about 1459 ohms At 70 degrees, it should be about 3500 ohms. If you want to ck the intake air temp sensor, you can use the same ohm readings as the coolant sensor. The coil packs are certainly a good possibility. They do fail. Ck your crankshaft position sensor. It should be 800-1200 ohms. If you can't figure this out yourself, you may need to find someone that has a scanner. This may help you.diagnose this problem. If you find this information to be correct would you please enter a "fixya" rating.