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Old 15 Apr 2011, 10:31 pm
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Default Why does my civic idle low and lose power?

i have a 98 honda civic with a D16y8 motor that idles low to where it almost dies and the acceleration is very poor and hesitant i also have some power loss because my headlights go dim what could be the problem p.s. im a noob at this obviously
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Old 15 Apr 2011, 10:46 pm
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What you describe might be a vacuum leak. Squirt WD-40 on all vacuum hoses (hope that it doesn't dissolve them). The WD-40 will temporarily seal a leak as it is sucked into the hole. Change the rubber hoses if they look old or cracked.































The problem might also be caused by an electronic ignition module (sometimes called a brain). That can function in an "emergency mode" but the car won't run well. You also described your headlights dimming (possibly a shorted electronic ignition module could dim lights a bit).































Sometimes you can see a burn area on an electronic ignition module.
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Old 15 Apr 2011, 11:01 pm
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The history of how this problem came about - was it a gradual thing or did you wake up one day and it was like this, or did you recently buy the car... - would be helpful, but there are only a few things that cause low idle. Vacuum leaks cause high idle in Hondas because Honda uses MAnifold Pressure sensors instead of Mass Air Flow sensors. Vacuum leaks are the same as opening the throttle.































The first place to start if you bought the car like this is the timing, but otherwise the top suspect is the EGR. If the valve sticks open it will lower the idle and reduce the power, and it is about the only thing that will do that without turning on the check engine light.
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Old 16 Apr 2011, 04:49 pm
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Default Re: Why does my civic idle low and lose power?

You could check your IACV as they soemtimes can get pretty dirty.

Otherwise you could reset your ecu and see if that helps.

If you want to reset your ecu just undo the negative side of your battery and let it sit for atleast 10 minutes. Then reconnect it and start your car with all accessories and lights turned off. Let the car idle for about 10-15 minutes or until the engine comes up to temp.

You could also seafoam your car if you wanted to. I have a 97 ek d16y7 and the cars are just old so a little tlc never hurt. It smoothed out my idle a fair but. I would recommend only using it in your gas and internals (access through brake booster line). If you put it in your crank case you need to change your oil after you run about 1 tank of gas through it otherwise it'll mess stuff up.
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