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2004 Honda Civic Base 4dr Sedan GX CVT w/Side Airbags

2004 Honda Civic
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
30 mpg city / 34 mpg hwy
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May 10, 2013, 1:53 pm

Falak T

Question: vtec is not engaging

Hello. i have a 96 honda civic with a swaped vtec d15b. my car doesnt engage vtec and also the rpm doesnt go further than 4000. in the morning the cars rpm drops as i pedal the accelerator to almost 0. after some time when the car heats up to normal the rpm drop gets a little better even in summers. when i leave the pedal the rpm goes up to 1000. the acceleration of the car is very weak in every gear.

May 18, 2013, 3:24 pm

Ron W
Expert Mechanic

Do you mean you swapped in a VTEC engine when your car originally did not have one? If so, you may never be able to get it to function correctly as the computer was not designed to work with that engine. Even if you swapped the computers as well, an OBDII vehicle (which this is) is VERY difficult to modify and make work properly.

I know this conversion has been done by others, so your best bet would to have a shop that does this type of conversion look at it. They will know what is needed to make it work as best it can.

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