My Saturn 2004 Ion was working great until we had a severe freeze, below 17F. Then the car started running rough, no power, really chugging. Check Engine lite flashing. Drove it about 2 miles to Autozone, they put the meter thing on it, comes back 'random multple misfirings,' Autozone guy thinks it just needs a tuneup. Could that just be it?
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Re: random multiple misfirings
Here is a list of possible causes. You should not drive the vehicle if the check engine light is flashing all the time, you can cause even more damage. It could pay to have a professional find the real cause.
Spark plugs that are incorrect for the application, cracked, improperly gaped or worn can cause the engine to misfire or run rough at all times. An IC module that failed to correctly control the ignition coil(s) will cause the engine to misfire or run rough at all times. Poor connections, broken wiring or wiring that has shorts to ground can cause the engine to misfire or run rough at all times. NOTE: Check connectors that might be pulled apart as the engine flexes or wires that short to ground as they pass near brackets or shorts to ground on the exhaust manifold. Fuel injector(s) that are shorted, plugged or partially restricted can cause the engine to misfire or run rough at all times. An ignition coil(s) that has low output, corrosion on the coil tower(s), is carbon tracked or arcs to ground will cause the engine to misfire or run rough at all times. A PCM that failed to properly control the injector or ignition timing will cause the engine to misfire or run rough at all times.
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Feb 5, 2010 - Uploaded by Scotty Kilmer
Scotty Kilmer, mechanic for the last 46 years and counting, shows how to fix your car if the check engine light ...
When the light is on have it checked for DTC'S - diagnostic trouble codes , do you know what they are ? Ignition system problem , coil's , plug wires if the vehicle has then . The check engine light code is probably for a engine misfire . Check Engine Light On
I'm confused! The heading on this question says 2004 Saturn Ion and the question itself says 1996 Nissan Maxima.
Doesn't matter much. The answer is the same for both. There are MANY things that can cause misfires. It could be spark plugs and wires. It could be ignition coils, it could be cylinder head gasket failures. It could be vacuum leaks. It could be broken or burnt valves. It could be faulty injectors....The list goes on, but I think you probably get the point by now.
Anyway, "Random cylinder misfire" simply means that you have more than one cylinder that is misfiring. It could be two cylinders misfiring or it could be ALL of the cylinders misfiring at times, or any combination in-between.
Not to sound rude, but when it says "vacuum leak", it means from the intake manifold. Get a can or two of Ether, and start the engine. Have someone run it at a steady RPM. Spray the ether around the manifold, and any hoses under the hood, until you hear the engine rev up. Spray along said section until you find the issue. Replace the offending part. As for the misfire, this should cure that, and if not, try simple things, IE, spark plug replacement, etc.
1174 is a lean code, and would have to been set first because it will not set when the 0300 is there. 0300 is a random misfire, because it read after the lean code, it was probably caused by the lean condition. 1st check for vacuum leaks from hoses or intake gaskets, you cal listen for a hissing sound, or spray carb cleaner around intake systems, a change in rpm will be noticed when spraying near a vac leak. other probable causes are the upstream 02 sensor, map sensor, or fuel delivery problems. does the vehicle idle porly, or does it miss at the top end?
usually when it gets colder outside the car will misfire and run rough because the ignition module/coil pack goes bad and makes it misfire,youre gonna have to replace the coil and module,,its the black long piece that sits on top of the spark plugs,1 wire connector and 4 10mm bolts remove them and pull up hard to pop the plug boots off the spark plugs,then install the new parts and you should be ok