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Old 12 Feb 2013, 09:32 pm
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Join Date: Feb 2013
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Default 2004 civic wont rev past 4k!?

I just got this civic and the check engine like is on and it was a rocker arm code and 02 sensor. but now its just the 02 sensor, it wont rev past 4k in neutral or in any gear. its weird though bc when i first start it its fine i can rev it wide open but before im too the end of my rode it does it again. ive read alot about this problem and know alot about hondas but im in need of some help. ive ran gumout and seafoam, i just got an oil change today, ive reset of ecu. ive cleaned the vtec seloniod gasket, i have no power issues so im confident it isnt my ecu or bad connection anywhere or grounded wrong. it does have a swapped engine just another d17a2 like original motor (previous owner blew 1st motor). motor only has 50k on it.
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Old 12 Feb 2013, 09:47 pm
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Join Date: May 2012
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Sounds like low fuel pressure or pinched fuel line from installation.Check vacuum line to fuel pressure regulator.
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Old 12 Feb 2013, 10:02 pm
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Join Date: Jun 2009
Posts: 151

The engine is in "limp home" mode on account of the bad O2 sensor. That is why it won't go over 4k rpm. Note that the computer ignores the O2 until the engine is warmed up, so that is why you can still rev it up when it is cold. Fix the O2 sensor problem.
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