Still have some problems - ahy ideas?

[Mike Rolica]

Well , is iac all the way open?  Sounds like you may be running a little
rich causing iac to open up to try and lean it out.. also what rpm is the
ecm aiming for at that temp?  Ide be looking at the cs and cold idle
parameters.  Ie maybe it is trying to run at 1200rpm, adding too much fuel
for the iac position causing it to sound fat and idle lower, so it opens iac
all the way and adds more fuel..
I may be way off but let me know.  You would hear definite tick tick tack in
ryhthm to the valve train and would cause vacume to go through roof and
fluctuate a bit.
Mike Rolica
Meridian Magnesium Products
Strathroy, Ont 
Ext. 260


	-----Original Message-----
	From:	Roger Heflin [SMTP:rah at horizon.hit.net]
	Sent:	Wednesday, December 08, 1999 10:39 AM
	To:	'gmecm at efi332.eng.ohio-state.edu'
	Subject:	RE: Still have some problems - ahy ideas?



	On Wed, 8 Dec 1999, Mike Rolica wrote:

	> 	Hear any lifter noise?  Lifters may be collapsed when cold,
too
	> thick of oil changing duration, and lift.  Would make higher
vacume until
	> they all pump up.  Are they hydraulic? If so whatkinda preload do
you have
	> on them?.. should be ¾-1 turn after pushrod play is eliminated.
	> 
	> Mike Rolica
	> Meridian Magnesium Products
	> Strathroy, Ont 
	> Ext. 260

	It sounds like it has a bigger cam when it is cold, so there could
be
	some lifter noise in there.   THey are hydralic roller lifters.  The
	preload is about 1 turn or so.

	The map pressure is reading 19-20, so the vacuum is more like 10 and
	when things get better the map reads about 15 so the vacuum is more
	like 15.   So something is causing me to have more air flow (IAC is
	wide open), but less vacuum, and whatever it is goes away.

	The car may have 10w30 in it, which may be too thick for these
temps.
	I will try changing the oil and see if that makes any difference.

					Roger