Question about 2007 Saturn Ion

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Engine lite on--code 304--also reader says-- cylinder 4 misfire--multiple

Engine lite on--code reader parts store PO304-- also #4 cylinder misfire multiple-- lite on 2--3days--then off--3--5days--do smell gas order though

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  • 40 Answers

Could be a spark plug or fuel injector. Replace the spark plug first because it's cheaper. Is the car making any strange noises or doing anything unusual?

Posted on Apr 30, 2014

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Posted on Jan 02, 2017

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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.

Posted on Oct 30, 2008

Zim1308
  • 543 Answers

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.

Posted on Jun 27, 2011

Mr BrokRench
  • 1623 Answers

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.

Posted on Jul 27, 2011

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1998 Toyota T 100 6 cyl. 2 wheel drive Autozone found Error codes 300,304,306 listed with them as: 300 multiple misfire 304 cylinder 4 misfire 306 cylinder 6 misfire Chilton's Toyota list as: 304...


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Codes read PO335, PO304, PO336 i need to know what they are for, Please !!


304 is misfire on cylinder #4. #4 is the middle cylinder on the driver's side.
The other 2 relate to the crankshaft sensor:

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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ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

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