I have a B16 in my CRX and the Idle goes up and down when I first start the car, then once it warms up it's fine, does anybody know what this could be.

 

its probably your TPS, throttle positioning sensor u should un plug it and see if it idles alright. Its goiing to steadily idle at like 1100 probably. It located behind the TB on IM facing the bottom of the car. Hope that helps.

 

really the tps huh... i'm gonna test and adjust mine.. do a search the info's there if not i'll post it.

mines doing the same thing.

 

Tell Me When Ya Get Some Results, let me know what happend...

 

i woulda thought it was my iacv on the back of mani

 

checked iacv, it's good 12ohms resistance.... went through rest of tests and got to replace ecu ..... yea ok.... i think not....

checked the deflection of my throttlecable w/ a metric tape measure, had like 25mm adjusted it 10mm

gotta find the tps adjustment and check proceedures.... i know i got them around here somewhere.

 

Unbolt the FITV (located on the underside of the throttle body) and unscrew the rear cover. U will see a white round thing inside, check to see if u can screw it in. If u can, screw it ALL the way in. Reinstall and see what happens.

 

umm what do u do if u don't have fitv.... (skunk2 mani, obd 1 jg throttle body)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by teler86 &raquo;</TD></TR><TR><TD CLASS="quote">I have a B16 in my CRX and the Idle goes up and down when I first start the car, then once it warms up it's fine, does anybody know what this could be.</TD></TR></TABLE>

check for leaks around the intake manifold gasket area. or just check vacuum with a gauge.

and check for other leaks.

try adjusting your idle up or down to see what happens.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drussell4801 &raquo;</TD></TR><TR><TD CLASS="quote">

try adjusting your idle up or down to see what happens.</TD></TR></TABLE>

won't that mess w/ the idle when it's warmed up too though, he says it idles fine when warm so idle screw shouldn't be the problem.

 

What's your idle when warm? Mine did the exact same thing. When it was cold it would go up and down when I idled but stopped once warm. It would also sometimes give a quick rev whenever I stopped at a light when warm. I would also tap the gas barely sometimes and it would rev it too on it's own which made my starts kinda feel unresponsive. I adjusted the idle screw while it was warm and, if my tach is correct, adjusted it to 650-750 warm idle according to my stock gauges. It doesn't rev when cold anymore, and it also starts up better and has better throttle response. Doesn't rev anywhere on its own. I think it's the ecu revving the engine automatically because the engine is idling too low. Hope this helps.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Majin Vegita &raquo;</TD></TR><TR><TD CLASS="quote">

won't that mess w/ the idle when it's warmed up too though, he says it idles fine when warm so idle screw shouldn't be the problem.</TD></TR></TABLE>

good catch, sorry, didn't explain well.

it's not a fix it's a diagnostic procedure basically

if you flow more air into the motor at idle it will help point to what the problem might be.

hondas don't like to idle too high. they get lumpy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fourthgenhatchB17 &raquo;</TD></TR><TR><TD CLASS="quote">Unbolt the FITV (located on the underside of the throttle body) and unscrew the rear cover. U will see a white round thing inside, check to see if u can screw it in. If u can, screw it ALL the way in. Reinstall and see what happens.</TD></TR></TABLE>
i thought the FITV was for cold start ups?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiRhatchalot &raquo;</TD></TR><TR><TD CLASS="quote">
i thought the FITV was for cold start ups?</TD></TR></TABLE>

It deals with cold starts and cold idle. The guy has a problem with cold start idle. Its the first thing that came to my mind...

 

http://www.integra.orcon.net.nz/tps

https://honda-tech.com/zerothread?id=965484

links to tps adjustment, mine was set at like .72 set it to .505 closed hits about 3.73 at wot