[V8] Idle speed too high
ekellock at gmail.com
Wed Jan 21 15:20:51 PST 2009
Ok, I have the throttle body off the car.
All the bearings and movement feel smooth and complete.
I could only push the throttle rod and make the idle decrease when I had the
TPS adjusted poorly.
The butterflies and walls are shiny clean.
What's this dashpot and what's up with the adjustment? It's got some paint
marks in yellow on the adjuster and locknut and they're kind of scratched up
so it's hard to tell if it's been touched before. Is there anything to open
up and clean? Is the adjustment procedure in the book?
I have a question about the two vacuum hoses that attach to the passenger
side of the throttle body. Where do they go, what do they do, what's on the
other end of the larger one? I can suck on it and get some fuel vapor sort
of air through it. Should I be able to? Is there some sort of canister
valve on the other end of it?
Another question... on the bottom of the throttle body, 3 of the bolt holes
have recesses around them with small plastic collars that fit into them,
probably to just help position the assembly when it's being installed. The
plastic collar is missing in one of these. Could that introduce a vacuum
leak? The gasket looks solid and I don't see any gunge on the mating
surfaces that might indicate a leak.
> -----Original Message-----
> From: v8-bounces at audifans.com
> [mailto:v8-bounces at audifans.com] On Behalf Of Ron Wainwright
> Sent: Wednesday, January 21, 2009 8:09 AM
> To: Ed Kellock
> Cc: v8 at audifans.com
> Subject: Re: [V8] Idle speed too high
> Have you checked/adjusted the dashpot Ed?
> But I agree that if you DID NOT fully remove the TB from the
> front of the car you should. To me it sounds like the
> bearings are sticky... if you can push the front of the
> throtle rod & make the idle adjust... I would remove the TB
> from the front of the motor & fully lube the bearings & clean
> off the TB butterflys top & bottom & the
> rims/cylinder/openings of the TB.
> --- On Mon, 1/19/09, Ed Kellock <ed.kellock at msn.com> wrote:
> > From: Ed Kellock <ed.kellock at msn.com>
> > Subject: [V8] Idle speed too high
> > To: "'q - V8'" <v8 at audifans.com>
> > Date: Monday, January 19, 2009, 10:29 PM
> > Patient is my 91 5spd. Idle speed is consistently a little
> too high,
> > like 1100. Here's what I've done....
> > -removed/cleaned ISV
> > -adjusted TPS
> > -opened up and cleaned throttle butterflies directly -lubricated
> > throttle rod/pivot assembly (it was and is smooth and returns
> > to stop solidly)
> > -went through everything again checking for vacuum leaks
> > -checked cruise control for adjustment etc., no
> > interference
> > Initially I could lower it some by pushing down on the
> > small lever at the
> > front and I found that I had the TPS adjusted so that it
> > was causing the
> > throttle to hang open a bit. I loosed the TPS, pushed down on the
> > level, backed the TPS off a little tiny bit more and snugged it
> > down. I
> > confirmed it still returns to closed throttle position
> > (click).
> > The last thing I did was unplug the ISV and start the
> > engine. The idle
> > seemed right for a moment but then slowly climbed up to
> > 1100. It seems
> > like it's ECU or something.
> > When I turn the engine off, there's a clack in the
> > passenger side fender
> > well. I know there's some emmissions shite in there, a
> reservoir and
> > a valve of some kind, but I don't know what it
> > should/shouldn't do. I am
> > fairly sure I've never heard a clack from that area
> > ever on any of my V8s.
> > Maybe I just never noticed.
> > Thanks,
> > Ed
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