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Old 29 Aug 2009, 09:31 pm
Join Date: Aug 2007
Posts: 40
Default why is my 2004 honda civic misfiring?

I changed the spark plugs and gaped them and its still misfiring. just so you know the honda civic doesn't have cap or rotor and it doesn't have wires either. so what could be causing the problem?

sorry the I-vtech does not use wires! thanks! but I did my research you most of had the DX or LX ha I have the EX
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Old 29 Aug 2009, 09:46 pm
Join Date: Aug 2009
Posts: 35

maybe because there are no wires, a dizzy or a rotor. is it a diesel engine that has glow plugs? i use to own a 04 had wires, plugs a dizzy and rotor.
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Old 29 Aug 2009, 10:01 pm
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Join Date: Jan 2009
Posts: 3

It uses an electronic distributor ( i.e. computer controlled ) and the box that distributes the firing order may be defective or may have been programmed incorrectly. First go to your local auto parts store and price the distributor module for the car... write that price down. Next go to a honda dealership and see how muck it would cost to check the module. It may be cheaper to replace the module yourself. If you are not comfortable doing so then i recommend the honda dealership. At any rate, best of luck.
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Old 29 Aug 2009, 10:16 pm
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Posts: 1,338

First of all, is the check engine light illuminated? if it is, there will be a stored code to indicate what the condition is that is causing the engine to run out of compliance with the emissions regulations. If the light is blinking then you have a misfire that can damage the catalytic converter and the car should not be driven. if the light is not blinking then you may have a problem that is not a misfire but a fuel management problem.

so lets start with the basic diagnosis--do you have the MIL (Check Engine) light illuminated? If yes, have you retrieved the DTC (Diagnostic Trouble Code)? If you haven't and the MIL is iluminated but not blinking then you'll need to take the car to a shop that has a GST (Generic Scan Tool) or to a Honda dealer to find out what the fault code is. If the car is in the USA you can take it to any Autozone parts store and they will retrieve the code for free.

if it is a misfire then the code will identify the cylinder or cylinders that are affected. if it is a single cylinder misfire the problem can be with the individual ignition coil for the affected cylinder or with a leaking fuel injector. also, if you did not use the Honda spark plugs then that could cause the problem as well. the OEM plugs are good for 110,000 miles and rarely fail.

if the code is for a multiple cylinder misfire then you have to look for things in common between the affected cylinders. it could be anything from a massive air leak in the intake system to a tank of bad fuel to a blown head gasket etc.

so get the DTC and let us know what it is if you need more help.

hope that helps
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