Code PO304 on code reader at parts store--also says #4 cylinder multiple misfire--lite on--2days--then off 3--5days--do smell gas though!!
Best thing I can tell u is check for sensors if bad or not, most time is ur O2 sensor, or cat sensor under ur car. but do make sure ur spark plugs is not bad. any thing the engine break inside, better off buy a new car. it should the car near it age.
Misfires can be from the ignition circuit ( coil/s HT leads -plugs) and it can also be from injectors (low fuel pressure -faulty injectors - leaking injector washers --wiring to injectors).
SOURCE: Random Cylinder Misfire
Get a Haynes manual for your vehicle and use the troubleshooting guide there. about $20 from amazon, auto parts store or haynes.com. This WILL save you time and shortcut this and any future diagnosis. Haynes IMHO are top notch and I like them better than some factory service manuals that fgo for $100 and more.
David, 99 Saturn, Cam position sensor codes seem to indicate a engine timing (not spark, but crankshaft/camshaft sync). Old timing belts or worn tensioners can cause belts to jump a tooth or two which can have a pretty dramatic effect. The belt could also be old/dryrot and have lost a tooth or two causing it to jump. If any of these are the case, or if the timing belt interval is near, replace timing belt, tensioner, idler roller if present and water pump. FYI, quality OEM ignition wires shold last at least 10 years. If they are really bad, you can open the engine compartment on a dark night and you will see sparks arcing between them and/or something metal nearby. We all replace wires when we are not sure what the problem is, and regardless of what anyone tells you, it only rarely solves anything unless the car is more than 10 years old.
good luck.
SOURCE: I have a 2000 Saturn
Have you tested the camshaft or crank sensor, often at times these two can get a little wily and intermittently malfunction.
SOURCE: 2003 SATURN VUE SERIVE ENGINE SOON LIGHT IS
The P0304 indicates the #4 cylinder is misfiring. The flashing light means the cylinder is not firing at all...It could be several things causeing it, coil, wires, plug, injector or vacuum leak. Do not drive your vehicle until you have this repaired, as it will lead to further more costly problems. Good luck, i hope this helps.
P0335 Crankshaft position (CKP) sensor -
possible causes: circuit malfunction Wiring, CKP sensor, ECM
P0336 Crankshaft position (CKP) sensor - range/performance problem
possible causes: insecure sensor/rotor, air gap, wiring, CKP sensor
Is the car running? If yes, check for a loose connector on the crank sensor. You may need to take the connector off and see if there is any corrosion on the terminals. If yes, do your best to clean with a small screwdriver and/or electrical parts cleaner.
From what I can tell, the sensor is on the bottom of the engine near the idler arm, but it has a long pigtail such that the connector is on top of the engine by the fuel rail. See pictures below.
for the misfire,
Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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