Questions/Problems: For untuned guys, where is A/F gauge at WOT? - Honda Prelude Forum

Padge · 08-14-2003, 06:15 AM

Mine is basically at 3 oclock, maybe about 3 or 4 ticks into the green, that seems really really rich when I am at WOT (not spraying). I think I remember that in the past, before I had my TPS problem and switched to a new TB, the A/F was always at about 2 or 1 green tick. What could cause the sudden richness?

Since I replaced the TB my engine bounces between 1000 and 1500 constantly when I am stopped, and I cant figure it out. Say I start the car, then i rev it, the revs will decrease to 1000 and then bouce to 15oo and will continue to do this until i drive, also my idle is at 1100 and I am pretty sure that my idle screw is pretty far to the right. Does anyone have any advice for me?

The reason I put this in nitrous is because no one else seems to be able to help me out.

typeshlude2001 · 08-14-2003, 08:54 AM

mine is like one or two clicks into green, off the bottle, but when i spray, sometimes u can see a difference, it didn't do this before, but lately it is acting kind of strnge, maybe bc of the hot weather or something, humidity?(i dont know if that ill effect it at all, just wonderin). does urs work out a little different every once in a while? or does it ALWAYS read EXACTLY the same? and at night, i swear to god it seem like at night my air fuel ratio reads leaner, i am guessing it is just becase i cant see ll the leds during the day and at night it is dark so i can see them, how far into lean/stoich does ur car go when spraying at night? does it really matter what the furthest tothe left led reads? or does it just matter where the end of it is, like all the way to the right? if u dont understand what m saking, ill elaborate more....

Vapor · 08-14-2003, 10:05 AM

The high idle is probably cause by a vacuum leak around the TB. Typical symptoms for a leak are a high idle, and if it's a bad one, a bouncy idle.

Did you do the replacement yourself? did you use a new gasket? might want to pull it and reinstall.

Padge · 08-14-2003, 12:25 PM

no i did not use a new gasket... what do you mean?
Sounds like you can help me!

Vapor · 08-14-2003, 01:25 PM

there's a paper gasket between the throttle body and the intake manifold. if you replaced the TB, that should have been replaced as well.

CLICK HERE

You need part #8. Possibly part #19. If you're feeling REALLY frisky, parts 4,5 and 6 may be a good idea also.

enjoy.

Padge · 08-14-2003, 01:28 PM

oh, actually my gasket is ripped. But why would that effect the idle? Esp since i thought the vacuum lines would be causeing the problems.

could i just make a new gasket myself?

NXLude · 08-14-2003, 10:01 PM

TB that are too big often mess with idle also

laughin2.2 · 08-14-2003, 11:12 PM

A ripped gasket will cause a vaccuum leak.

Vapor · 08-16-2003, 11:33 AM

^^^ what he said. plus what we talked about in PM.

lol, cmon man, if you ripped the gasket, get a new one. whether it might leak or not, get it because it's only 3 bucks for a fresh new gasket.