Hi I have a 98 civic just put a motor in it my car is a 5 speed n the motor came out of a auto but my question is it is running really rough n it runs rich but at the same time it idles high by it self somtimes then drops dwn below 500 rpms changed icav n cleaned throttle body as well timing is dead on new plugs wires cap rotor but I still have this prob hope u can help thanks my name is tim

SOURCE: Car engine dying 98 Honda

Check the main relay. They have been know to cause this problem when they get hot. Also check the Top Dead Center sensor.

John Weathers

• 409 Answers
• Posted on Dec 24, 2008

SOURCE: Honda Misses.

Pin point the dead hole and check that injector.

SOURCE: rough idle on 1990 saab 900 convertible, 16V

Because the car has adaptive technology, it may take a while to reset and adjust to the new, cleaner and better conditions than those to which it had previously adapted.

Did you change the cap and rotor? if the plugs needed replacement, likely they do too

Possible other causes include:

loose or corroded connections to any electrical component you disturbed (make a checklist and tick them all off as you check them);

mis-reinstallation of any F.I. part disturbed(checklist again)

obstructed water flow through the AIC valve;

improper voltage output from the AIC valve (for LH 2.4 systems, should output 8 volt at idle, dropping as load increases; for LH 2.4.2 system output 7 volt at idle etc; testing between terminals)33 and 17 at disconnected LH connector;

possible problem with MAF.

Hope this helps

Saabreur

SOURCE: 89 honda civic fails smog

bingles,,,have you changed the oilseals on the valve stems or used the old ones?these tend to harden after a few years and even a slight leak may lead to high emissions, also v,important did you use the old head gasket or replace it? always use a new gasket as an old one has already been compressed and may cause a cross-flow leak into one or all of the piston chambers.
hope this helps.

SOURCE: My 98 honda civic lx (automatic) idles high around

with your a/c issue, the compressor might be faulty and not engaging and disengaging. have the a/c system level checked and recharged if necessary...if okay, then start to check the clutch in the compressor to see if it kicking it or not...maybe the low side or high side switch...as for your idle, it really didn't sound like a distributor,.....to me it sounds like you have a faulty, Idle Air Control Motor in the throttle body allowing in too little air, and when a/c is on, its just right...have them both checked,