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  #1  
Old 05-01-2013, 06:28 AM
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96 s320 engine running rough, engine light on, 110,000 miles

Perform OBII scan reveals 2 codes. P300 and p301. Never change spark pugs or wires please advise. Thanks much.

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  #2  
Old 05-01-2013, 07:01 AM
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clean Maf sensor,if that does not make it smooth change plugs wire are good for 250,000 miles.my advice was for someone who can't read the codes
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Last edited by oldsinner111; 05-01-2013 at 07:48 AM.
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  #3  
Old 05-01-2013, 07:32 AM
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Both codes suggest a secondary ignition miss fire.
Spark plugs and or wires are the most likely cause.
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  #4  
Old 05-01-2013, 02:18 PM
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You are ignoring the maintenance requirements of your car if you haven't changed your plugs in 110,000 miles.

Spark plugs are a few dollar a piece.
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  #5  
Old 05-01-2013, 04:12 PM
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You may have broken vacuum lines too.

I had one similar code like yours, and I found the a rubber wye vacuum fitting just gooey and nearly melted(remember it is just rubber). This vacuum fitting is around the bottom front of the throttle body. I had about the same amount of miles when it happened to me.

Check for vacuum leaks.

When you remove the plastic cover to get to the plugs and coils. Two plastic vacuum lines run through there, and those control the EGR and electric air pump valve.

Martin
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  #6  
Old 05-01-2013, 04:38 PM
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Isn't the spark plug change interval on that engine 30,000 miles? Exceeding the change interval by 400% might cause some running issues...
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  #7  
Old 05-02-2013, 06:07 AM
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you can go 60,000 miles with Bosch Super plugs,100,000 with iridium plugs.
But plain copper gives the fastest 1/4 mile times.
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Old 05-02-2013, 08:11 AM
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If I am not mistaken, P0300 is Random cylinder misfire. P0301 is Cylinder 1 misfire. P0300 can be caused by the P0301 so find out what is wrong with cyl #1 first. Probably a coil.

Paul
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Old 05-05-2013, 02:14 PM
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Thanks much everyone. Change plugs. Looks fine

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