91_ZC_Honda Posted September 16, 2002 Share Posted September 16, 2002 As I've posted in other posts I'm running a ZC engine with a DC Sports header. The question I have is how do you know if you're car is running to rich or too lean? And how can you fix it? Maybe this has nothing to do with too rich or too lean but whenever I first start up my honda as soon as I press down on the gas it seems to want to stall. After a few minutes of warming up it seems fine. Also while driving when pushing down on the gas, not slightly, but more along the lines of picking up speed quickly I can hear a sort of whistling sort of. Kind of hard to explain the noise in words. ANYWAY, just wanted to know if any of these things has to do with running too rich or too lean. Oak Harbor Squid Link to comment Share on other sites More sharing options...
EGRacer Posted September 17, 2002 Share Posted September 17, 2002 dude all motors do that. its because they are cold. either let it warm up or maybe bring up the idle a little. i broughpt my idle up a little to about 800 when it started doing that and its fine now. and ull tell if its rich cause youll smell it and if its lean u wont tell as much Link to comment Share on other sites More sharing options...
jdk88888 Posted September 19, 2002 Share Posted September 19, 2002 get yourself a good O2 sensor. you can just splice it right into the stock sensor wiring. On another note, the stumbling at startup is most likey related to your O2's... they need a little warming up before they begin to work optimally. I believe the ecu runs rich for a while before they warm up as to not damage the engine. Not sure what the whistling noise is... I've never heard it, but if it's more of a whining, it's probably the tranny... not really anything to be worried about though. Link to comment Share on other sites More sharing options...
boosted Posted September 25, 2002 Share Posted September 25, 2002 Add a AFR meter. Not the one with those crappy LEDs (they don't tell you crap), but an analog one or one that tell's you the exact A/F mixture. EDIT: Oh yeah do you have an intake? If not, the noise is probably coming from your exhaust manifold gasket. Check around the header or on the hood to see if there's any black soot. Link to comment Share on other sites More sharing options...
EGRacer Posted September 26, 2002 Share Posted September 26, 2002 wow thanks for the info man that will help me out in the long run if i ever have that problem Link to comment Share on other sites More sharing options...
viperhack Posted November 19, 2002 Share Posted November 19, 2002 easiest way to tell if a car is running too rich or too lean is to check the color of the plugs. If they are black it's too rich, if they're white or really light tan or grey it's too lean. the optimal color should be a medium shade of tan or grey. Link to comment Share on other sites More sharing options...
SIR_VTEC Posted December 31, 2002 Share Posted December 31, 2002 I have a ZC motor in my car and it runz hella rich, i go through a set of plugs every month...exactly how would I stop this engine from running so damn rich? Link to comment Share on other sites More sharing options...
auto-x_CRX Posted January 1, 2003 Share Posted January 1, 2003 If your engine is running extremely lean, the plus will actually start to melt. This is bad, if you havent figured it out. Several companies make A/F meters that tap into your O2 sensor, to give you a good reading. SIR VTEC, if your engine is running rich, you can do several things. Make sure the voltage output to your fuel regulator/pump is within specs, make sure your ECU isn't giving you any codes(email me if you don't know how to get the codes-mcfly@nc.rr.com). Also, a slightly higher budget approach is to improve airflow. Add an intake, headers, exhaust, port and polish the manifolds, etc. If that fails, give RC engineering a look at www.rceng.com. They are honda fuel injection specialists, and can help you solve your problems. -Matt Link to comment Share on other sites More sharing options...
SIR_VTEC Posted January 2, 2003 Share Posted January 2, 2003 Good god man u know too much!! Heh, but yea i'll email you. Link to comment Share on other sites More sharing options...
PROFILES2000 Posted January 14, 2003 Share Posted January 14, 2003 get yourself a good O2 sensor. you can just splice it right into the stock sensor wiring. On another note, the stumbling at startup is most likey related to your O2's... they need a little warming up before they begin to work optimally. I believe the ecu runs rich for a while before they warm up as to not damage the engine. Not sure what the whistling noise is... I've never heard it, but if it's more of a whining, it's probably the tranny... not really anything to be worried about though. how can you call that a good air fuel gauge i wouldnt trust anything over one of those.... i had the greddy air fuel electronic air fuel meter (with its own heated o2 sensor) and i still thought it was off a little the only real way to check your o2 is on a wideband o2 sensor. they are expensive or you can just go to a dyno that has one and go from there. they are the most accurate ways seeing if you are lean or rich Link to comment Share on other sites More sharing options...
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