ckyhimself

ok... i did search for this and couldn't find quite my problem explained....

(i have a 90 crx si)

my idle would rev it self up to about 2500 then drop to 700 and repeat... just rev it self... and pretty quickly... (this was about a week ago)
the ecu was throwin a code 1 (02 sensor) so i went ahead and replaced that...

the problem seemed to go away for a little bit... but now its back... and not at every light.... like every 3rd light i'm sitting at in neutral it'll start doing it...


i've replaced my fuel filter (as it needed it anyways) and tried using anohter o2 sensor...

if anyone else has had this problem and can give me some possible soloutions that would be great.... thanx guys

my only geuss is that it could be a map sensor or a tps???? but i'm not too shore and don't have $$ to throw into tons of parts for trouble shooting... but may have to

Doomster9

On the back of your intake manifold on the passenger side, there is a little metal box where two coolent lines come out of (very small lines) and one plug. Take off the two bolts holding it down and hose the inside of the thing down with carburator cleaner. The part I am talking about is the Idle Air Control Valve = IACV. Honda/Acura seems to have a bad problem with those, but for a 14 year old car its to be expected. If that doesnt help you, might I say agian it is a 14 year old car and that the gaskets are probly hard and cracked? Dont neglect your gaskets/hoses! Just my $0.02

ssl2k

When you removed your O2 sensor, was it all fouled up ( covered in black crap?)

I'm also having t he same problem, but not as big of a jump, it will idle at about 1000rpm, then jump to 1500-1700 then drop down.

i have no idea what it could be, becuase it did the exact same thing w/ my d16a6 and now it does it with my ZC...

nathan

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1991 CRX SI - Built D16Y8 - The piston melter
1990 CRX SI - B18A1 ... ls/vtec in the process y0
1988 Civic DX 4dr - d15b2 w/ mpfi + flaterate t-25 kit

ckyhimself

i cleanedn... and then replaced my IAVC.... not the problem... CKd the 02 sensor again.... definatly clean and fine.... next is the map sensor..... hopefully something will solve this

pills_PMD

http://www.hondaswap.com/~pills/idlefix.html

there is a quick list of fix its..
in addition you may want to bleed your coolant to be sure there is no air in the system.

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11th world conference on titanium

91SiZC

i have the same prob with my SOHC ZC...any suggestions?