RE: RE: [engine] idle hunting...

["Fry, Larry" <LEF@chem-tronics.com>]

Neal-
What Dan's describing is not "lifter" tap, it is rod knock.  
...my opinion and I'm stickin' to it.

Larry  sandiego16V 

-----Original Message-----
From: Neal Tovsen [mailto:res00ffj@verizon.net]
Sent: Friday, October 19, 2001 10:10 AM
To: Fry, Larry
Cc: danws69@earthlink.net; roc "E-mail"
Subject: Re: RE: [engine] idle hunting...


But what Dan's describing is oil starvation from the RPMs falling so low
(near 0). This describes lifter tapping (the correct term is "cam follower"
on an OHC engine), and has nothing to do with the block. However, if the
tapping doesn't immediately go away when RPMs go back to normal, it may
indicate new lifters are needed or that his oil pump is weak. Neither are
terribly difficult or expensive, but that's another story and I presume
isn't the problem...

Neal


> 
> From: "Fry, Larry" <LEF@chem-tronics.com>
> Date: Fri, 19 Oct 2001 08:56:41 -0700
> To: danws69@earthlink.net, "roc (E-mail)" <scirocco-l@scirocco.org>
> Subject: RE: [engine] idle hunting...
> 
> lifters tap....rods knock.  Sounds like you will be rebuilding the lower
end
> soon. 
>  I've been chasing the same idle problem since I bought my "87 16V two
years
> ago.  If you uncover the cause, let the list know!
> 
> on the same post; my in-car voltmeter reads one volt lower than my
> multimeter says the batt/charging voltage really is (e.g. 12.5V vs.
13.5V).
> Anyone got the reason/fix?
> 
> Larry  sandiego16V
> 
> -----Original Message-----
> From: dan [mailto:danws69@earthlink.net]
> Sent: Friday, October 19, 2001 8:18 AM
> To: roc (E-mail)
> Subject: [engine] idle hunting...
> 
> 
> ...are there any on-line tech procedures done for this subject yet? I've
> heard some talk about an air/bypass valve? I recently had that funky
2-piece
> hose crap out on me, and aside from the high idle, it wasn't doing this up
&
> down crap.
> 
> My current situation is:
> -car starts fine
> -when coming to a stop sign/light, rpms drop (alt light comes on briefly)
> rpms rise to 2000, if I don't tap the gas, it'll drop way low and die.
> 
> NOW GET THIS:
> If I have the a/c on, idle is PERFECT. Luckily I'm in Florida, but
> occasionally we get nice weather...
> 
> I really HAVE to fix this because of the side effects of the idle problem:
> -when it drops super-low my oil pressure drops too low and then I get a
> scorching case of lifter-knock.
> -alternator stops charging properly, it charges, but not at the level that
> it started at (i.e. 10.5~11 VDC) - (yes, I've verified my gauge by
sticking
> my multi-meter on the battery terminals).
> 
> 
> 
> Sorry for the longer-than-usual post from me.
> 
> Dan
> '81 Rabbit Sport Truck
> '87 16v Scirocco
> '00 Jetta
> Tam-pa, FL
> http://home.earthlink.net/~danws69/index.html
> 
> 
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