Have you ever messed with the butterfly stop adjustment? Have you ever cleaned the butterfly with carb spray? You can take a look at the stop screw adjustment, maybe it's not letting the plate close all the way. Or, if you have sprayed it, maybe you dissolved the coating that helps seal the butterfly to the bore. If so, you can clean it and hit it with some spray paint to help seal the butterfly.
TurboDog's Dad Bill Cardell www.flyinmiata.com 1-800-FLY-MX5S 970-464-5600 tech support Don't miss our Open House! August 14-17 -----Original Message----- From: Rob Ebersol [mailto:[email protected]] Sent: Sunday, February 01, 2009 6:33 PM To: Bill Cardell Cc: List Miata Power Subject: Re: Vacuum leak: 1.6 throttle body doh. I meant that I removed all the intake pre tb, so it was just the tb and the two valves. After the car was warm, I put my hand over the tb with the idle screw shut and the car nearly stalled. That's with the screw all the way in. The idle does seem to recover some- can't see it, but it's low. But that to me is indicative of the IAC working. I bench tested both valves as ok prior. But what got me was the amount of air slipping by the tb. It was literally difficult to pull my hand off the opening once it was sucked "in". Not exactly scientific, but I wondered if that was typical to have such a large amount of suction... maybe it is because it's a 2.0L sucking thru the 1.6 tb? On Feb 1, 2009, at 7:55 PM, Bill Cardell wrote: > Sorry, Rob, I don't understand what you're saying. How can the engine > idle with the TB off? > > > TurboDog's Dad > Bill Cardell > www.flyinmiata.com > 1-800-FLY-MX5S > 970-464-5600 tech support > Don't miss our Open House! August 14-17 > > -----Original Message----- > From: Rob Ebersol [mailto:[email protected]] > Sent: Sunday, February 01, 2009 12:05 PM > To: Larry Alster > Cc: Bill Cardell; 'List Miata Power' > Subject: Re: Vacuum leak: 1.6 throttle body > > My leak is on the "outside" of the tb. When I removed the tb from the > intake setup, leaving both air valves attached, it idles at what is > currently normal 1200rpm. If I put my hand of over the tb to plug it > up, the idle drops and the car almost stalls then it rises back up to > about 900rpm. That leads me to believe the IAC is doing it's job at > that point. > > Haven't blocked off either of the air valves. It is a 1.6 tb mounted > to the top half of a 1.6 manifold welded to the bottom half of a kia > sportage 2.0L manifold. The top have has all the OE 1.6 idle control > stuff. > > At one point, way back, I had the idle set per the FM Link manual and > somewhere along the way I had an idle hiccup. There was other stuff > going on with the car at the time so I didn't pursue it - 1200rpm idle > is definitely tolerable, but 900 is better IMO. FWIW the GA emissions > actually allows a 1500rpm idle on my 90 Miata. :-\ > > > On Jan 30, 2009, at 7:04 PM, Larry Alster wrote: > >> But if you have another leak somewhere else now, running the screw >> all > >> the way isn't going to stall the car since you have air coming from >> somewhere else. Larry >> > > > On Jan 30, 2009, at 7:03 PM, Bill Cardell wrote: >> How about with the IAC hose blocked off? You say 1.6 TB, but is it a >> 1.6 engine? >> >> >> Bill Cardell _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
