[V8] Idle speed too high
dsaad at icehouse.net
Tue Jan 20 06:23:13 PST 2009
Sounds like a vacuum leak to me...
On Jan 19, 2009, at 11:03 PM, Ed Kellock wrote:
> I used 3-in-1 oil to lubricate. I did not disassemble anything.
> Prior to that I used Liquid Wrench to clean the area and work the
> to free it up real good. It did not feel stiff or sluggish in any
> way to
> begin with.
> Actually, I forgot to put the 3-in-1 oil on the front pivot of the
> throttle linkage before reinstalling the throttle body.
> The action of the throttle is and was very smooth and I am very sure
> the mechanical action is not the problem. On general principal, I do
> believe there is more I can do to ensure its longevity, etc. but for
> I really believe there is another issue affecting idle speed.
> It may be time to do some parts swapping. The 1990 V8q came home this
> evening with a misfire so it will be staying with me tomorrow while
> the 93
> carries the GF to work. While I'm at it, I might as well start
> parts around between the 90 and 91.
> On the 90 V8, I recently replaced spark plugs and distributor caps
> due to
> long cranking times when cold. I did not have rotors at the time.
> I used
> Autolite plugs, but I went up one step... I'm not sure if they were
> platinum, but I know they weren't the iridium. I recall some
> about Autolites failing, the center electrode physically separating
> the rest, so I will check for that. I'll start by trying to isolate
> cylinder is not firing and go from there. This weekend I did a tranny
> drain/refill as well as replaced the coolant reservoir. It ran fine
> afterward and again yesterday for a trip to the market. Seems the
> was first present this morning. Anyway...
>> -----Original Message-----
>> From: Ingo Rautenberg [mailto:ingo.rautenberg at gmail.com]
>> Sent: Monday, January 19, 2009 8:51 PM
>> To: Ed Kellock
>> Cc: 'q - V8'
>> Subject: Re: [V8] Idle speed too high
>> Hmm. When you say that you lubricated the throttle rod/pivot
>> assembly -- did you do front and back? By front I mean at the
>> bearing you can't see but can feel when you remove the throttle
>> body. This one really tends to dry up and should be lubed at the
>> least or (preferably) replaced.
>> On Jan 19, 2009, at 10:29 PM, Ed Kellock wrote:
>>> 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
>>> 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
>>> 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
>>> seemed right for a moment but then slowly climbed up to 1100. It
>>> like it's ECU or something.
>>> When I turn the engine off, there's a clack in the passenger side
>>> 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.
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