leaning out the carb?

[LAZLOI7]

the fine folks at the emissions testing place say i need to lean out the carb for it to pass... how exactly do i go about doin this? any tips.. suggestions.. comments would be helpful..
thanks!

[Tourettes]

what kind of carb?
2brl?
4brl?
stock?
aftermarket?
etc????....
a little more info please.

[LAZLOI7]

as far as i know... its the stock carb on an 84 grand wagoneer... 2brl...

[joe]

For the mix screws on an MC 2150...clockwise is leaner, counterclockwise is richer. Personally I'd do it with a tach and set them at the optimum setting and then if it still doesn't pass maybe try a bit leaner just to get through the test and correct them before you drive home. Just blindly ham handing the mix screws can get you too lean and you could be adding new pistons to the cost of the inspection. :(

[LAZLOI7]

hmm... ok... now my question is this.. how do i hook up a tachometer? or maybe i should just take it to a shop? what does making it too lean do to the pistons? as you may have guessed.. i'm not to savy on the whole engine/mechanical stuff...

[PhilSine]

Buy an aftermarket tach (as if there was a stock one in the first place :D ) and it will include instructions. My tach hooks to the positive lead on the coil.

[reddog]

If you need to lean out the carb to reduce HC (HydroCarbon) emissions at lower RPMs then the idle screws may/will help some. My experience here in CA is that the optimum setting is too rich. Typically you need to go on the lean side of the adjustment which means idle RPMs will drop a little and you adjust the idle speed up a touch to get it to idle at the right speed. Joe called it - adjust to past the test and readjust to optimum (highest/smoothest) idle speed after the test. The lean idle setting to pass the test should not hurt your pistons at all. If you turn it too lean it has the potential to hurt the pistons but the chance of damage is small. The real damage can occur if you go too lean when you change the jets - something you won't be doing.

Kerry

Kerry

[ August 05, 2002, 03:46 PM: Message edited by: reddog ]