can to cold of a plug cause a rich condition?
03-21-2005, 11:28 AM
#1
Drifting
Thread Starter
can to cold of a plug cause a rich condition?
for my nos setup before i did my heads and cam i went with 2 heat ranges colder sparkplugs. ive been tring to get my car tuned right, and finally my blm is about 130.. but ive noticed excessive smoke out the exhaust. everything in the car is new and working properly. the plugs look very black, like is not burning hot enough. it is definatley not rich anymore at idle. could the heat range of the plugs be cold to burn all the fuel?
im going to put the stock heat range back in for now and see if it helps.
im going to put the stock heat range back in for now and see if it helps.
03-21-2005, 11:41 AM
#2
Race Director
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The black smoke out of the exhaust is proof that too much, air/fuel is burning. A cold plug won't make the mixture entering the cylinder, rich, but it can make the exhaust LEAVING the cylinder, rich, if all the mixture isn't burning. I would expect a fuel rich exhaust to have the O2 reading sent to the ECM cause the ECM to try to lean the mixture. If the O2 is contaminated or the fuel supply is so overwhelming, that the ECM can't keep it in check, that could cause it to run rich. I wouldn't expect plugs, colder by only two heat ranges, to misfire so badly as to cause this in a short amount if time. I'd be looking at the fuel system. Injector size, fuel pressure, prom tune, etc.
RACE ON!!!
RACE ON!!!
03-21-2005, 11:55 AM
#3
Drifting
Thread Starter
ive been working with tpis to get this tune right. i even sent them the injectors to have them flowed so they can adjust the injector constant correctly. i really dont think the tune is off that much anymore.. ive been using datamaster to do logging. it may be off some..
the o2 reading are within specs and it seem to be workin properly. my fuel pressure is even low right now at 40 psi.
the o2 reading are within specs and it seem to be workin properly. my fuel pressure is even low right now at 40 psi.
03-21-2005, 04:36 PM
#5
Drifting
Thread Starter
Originally Posted by CFI-EFI
Then you must not have a problem. Maybe the black smoke is a figment of your imagination. If all is good, why the post?
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RACE ON!!!
could i have put the cam in off one tooth? but ive done a lot of cams and havent yet.
at idle im holding 15 psi of vacuum so i think an intake leak is out.
base timing is at 6*
is wont backfire if i turn the timing up to 12*or higher but i get a lot of spark retard.
i did a running valve adjustment and they were fine.
i need to do a compression test tonight.
its acting like a spark plug wire is on wrong. but its not.
i dont know where to go next..
03-21-2005, 06:00 PM
#7
Drifting
Thread Starter
