i have a 93 sol with a jdm d15b swap, manual s20 tranny swap, and it just started doing this. When i start it and hold the clutch in the idle surges. has anybody ever had this happened?

 

try cleaning your IAC Valve

 

vacuum leak or MAP sensor.

 

so do those three things have to deal with the clutch? its only with the clutch pressed in, when its depressed its fine.

 

if only does it when your clutch is pushed in because there is no load on the engine hence nothing to stop it from surgeing up and down.

 

cleaned the iacv, still doing it, checked for vacuum leaks and theres none of those. how would i test the map sensor?

 

either find a buddy who will let you try his on yours or I think but don't quote me on this that autozone will test them. If no leaks and IAC is clean then its more then likely the MAP.

 

they are right its alway two major things iacv or leak in vacuum lines 9 out 10

 

air bubbles in the cooling system cause this too!

 

nope theres no air bubbles, i just did a coolant flush and checked that 1st thing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sol_93 &raquo;</TD></TR><TR><TD CLASS="quote">nope theres no air bubbles, i just did a coolant flush and checked that 1st thing.</TD></TR></TABLE>

Yes but did you bleed your system

 

of course! im not an idiot lol

 

Got a Q....is it ONLY when the clutch is in...or if you put it in neutral and let the clutch out does it still surge? Think it's an idling problem..which isn't just when your clutch is pushed in, it's whenever ur at idle..

Does the idle even out at any time? like after the car's warmed up or something?

 

its only when the clutch is pushed in. and i believe i found the problem....the dumbass that had it before me converted it to manual and didnt change the ecu to a manual ecu so its throwin a code for neutral position sensor.

 

Yeah, that would do it..

I was gonna say, all these bitches are like "IACV!!" or "AIR LEAK" etc. etc. but if it's ONLY when the clutch is in (and not when you're in neutral with the clutch out) then I highly doubt it's any of those things.

To tell you the truth though I didn't even know there was a neutral positioning sensor...I did a auto &gt; man conversion ...oh nvm...I used a man ECU right from the getko...blah...

Ya, well glad to see u got it working....

 

yea im just waitin on my ecu to get here now. stupid bitch shoulda changed it in the first place lol.

 

**** thats news to me about that