Got A Major Problem
Thread Starter
Teching In
Joined: Mar 2007
Posts: 47
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Got A Major Problem got a problem...my car wont pull past 4500, feels like its being dragged back after 3000, spark knocks at WOT, and i keep getting 0302(i think)-misfire cylinder 2....i have changed the coil, the wire, the plug, and the injector...still the same symptoms, still the same code. car idles smooth, and runs ok until it gets above 2000 rpms....ANY SUGGESTIONS???
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TECH Enthusiast
Joined: May 2004
Posts: 735
Likes: 1
From: St. Louis, MO
Do you have the stock exhaust on it?
the converters could be clogged.
You could've had someone/someplace diagnose it for the trouble you've had.
A real scanner could show you fuel trims/02 counts/maf readings....etc. and if it's running that bad it probably would've been an easy diagnosis.
the converters could be clogged.
You could've had someone/someplace diagnose it for the trouble you've had.
A real scanner could show you fuel trims/02 counts/maf readings....etc. and if it's running that bad it probably would've been an easy diagnosis.
How does the car behave when cold? In the first few minutes (before the car goes to closed loop) if the car acts funny then its probably NOT the O2 sensors. If the performance issues arise after about 5 mins its probably the O2s.
Since your issue is happening around 4000 RPM I would check the MAF first. The MAF is the sole source for air calculations past 3500 RPM. Disconnect the MAF and see how the car runs (caution you'll get a check engine light doing this). If it run OK then its the MAF.
To answer your question, yes you can run without O2's but you'll need to get an open loop tune.
Since your issue is happening around 4000 RPM I would check the MAF first. The MAF is the sole source for air calculations past 3500 RPM. Disconnect the MAF and see how the car runs (caution you'll get a check engine light doing this). If it run OK then its the MAF.
To answer your question, yes you can run without O2's but you'll need to get an open loop tune.