Just did a engine swap the other day for a friend, and notice that the idle isn't the same anymore. Before, idle was perfect, cold start or warm start was normal, but now idle jumps up to 1500rpm for couple of sec and goes down to 1100rpm for couple of secs and goes back up on cold start........ the set-up before was a stock b16, now is a stock internal b20v with bolt ons, and there is also no check engine light!

Here's a little video on cold start, maybe it might give u guys a better idea of what im talking about.



Modified by b20vtech at 8:19 AM 8/25/2008

 

Check the fast idle valve , they tend to loosen up internally and they start to idle like that when cold. Eventually it is going to get worse unless you open it and tighten it up. Try that and let me know.

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Humble Performance &raquo;</TD></TR><TR><TD CLASS="quote">Check the fast idle valve , they tend to loosen up internally and they start to idle like that when cold. Eventually it is going to get worse unless you open it and tighten it up. Try that and let me know. </TD></TR></TABLE>


I agree it sounds like the FITV. I went through the "non-sense" of fixing it twice then I removed it and the problem went away.

 

lol, its a Professional Pro. 68mm TB that does not have the FITV.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vtech &raquo;</TD></TR><TR><TD CLASS="quote">lol, its a Professional Pro. 68mm TB that does not have the FITV.</TD></TR></TABLE>

What was it tuned with. Sounds like you my need a little enrichment.

 

it has not been tuned yet! its running on a p28 chipped ECU, i don't know what kinda chip it is.!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vtech &raquo;</TD></TR><TR><TD CLASS="quote">it has not been tuned yet! its running on a p28 chipped ECU, i don't know what kinda chip it is.!</TD></TR></TABLE>

You just answered your own question.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote">

You just answered your own question.</TD></TR></TABLE>

it wasnt idling like this on the b16 and it wasn't tune on the b16 also but idle was normal.

 

given that it idled fine on a B16 does not imply it will on a b20. You need to get some tunning done.

 

I just check the TPS with a Voltmeter cause we had to switch from the stock TB to the 68mm TB, it's at 0.93 when tb is closed, and 4.85 at WOT.... is that normal or is it off??

 

did you bleed the coolant system?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4g hatch &raquo;</TD></TR><TR><TD CLASS="quote">did you bleed the coolant system?</TD></TR></TABLE>
no, thanks for the heads up i will try that... what are the steps?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vtech &raquo;</TD></TR><TR><TD CLASS="quote">I just check the TPS with a Voltmeter cause we had to switch from the stock TB to the 68mm TB, it's at 0.93 when tb is closed, and 4.85 at WOT.... is that normal or is it off??</TD></TR></TABLE>

No, it should be .5v closed.

 

honda tps blow.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">

No, it should be .5v closed.</TD></TR></TABLE>

i tryed adjusting it to .5v but lowest it could go is .7v cause anything lower than .7v it will start up and idles low and just dies...

 

should i try a different TPS ?

 

dont mean to thread jack but how do you adjust the tps?