Hi folks

Got an idle issue with an AE102X corolla, and have tried the following:

Have replaced spark plug leads (acquired from Toyota)
Changed air filter (genuine Toyota filter)
Ran some fuel injector cleaner through to clean injectors (Wynns and another
brand)
Have changed engine oil (was needed anyway, changed from Shell Helix Ultra
to Silkolene)
Have had water pump and timing belt changed (needed anyway)
Have tried changing fuel source (usually Shell unleaded) but has not really
helped.

Since running fuel injector cleaner thru the fuel it appears to have helped
but hasn't removed the problem - should I continue to run injector cleaner
through a few more times and see if this helps?

Only thing I havent tried yet that I can think of trying is changing spark
plugs from the
Bosch Super 4's I installed back to regular spark plugs, and also have not
changed
the distributor cap.

Also noticed it is more frequent in the morning after the engine has "warmed
up".

What exactly happens is that when the A/C is off and the car idles at lights
for
example, the cars revs change either up or down from its usual 800rpm spot
that it
idles at most of the time. It would jump or drop around 100rpm when it does.
Sometimes
this might be more or less, usually around 100rpm. It does not do it every
time, but once or
twice at one set of lights is pretty usual (depending on the set of lights
and arriving etc).

I've also since noticed that the engine changes its idling rpm when turning
the steering wheel while parked or stationary.... and my wifes auto AE102X
that is 2 years
older doesn't do this (hers is an auto and previous "series" of AE10x range
from mine).

Any help or advice much appreciated.

Thanks.
Paul

Are you sure when timing belt was changed they did not slightly screw up the
timing ???.

--
Regards
Marcus

"Paul C" <pauldcook (AT) yahoo (DOT) com> wrote

I've actually heard of Bosch plugs causing issues in some cars. Whip em out
and try some different plugs, might I suggest NGK or another brand similar?

Cheap thing to test y'know...


Nick.



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Hi Marcus

Thanks for the reply

I had this problem before the timing belt + water pump were replaced.
Someone had mentioned to me that changing the timing belt may have helped
with this problem, but it didn't.

Paul


"Marcus" <asif (AT) getreal (DOT) com> wrote

"Nick Trounson" <nodisclose (AT) iie (DOT) com> wrote

Hi Nick

I've had someone else mention that Bosch plugs have caused issues and had
NGK recommended as a better plug to try.

Shall give it a go.

Thanks for your reply.

Paul

On Fri, 23 Apr 2004 01:03:28 +1000, Paul C wrote:

I have a 2001 corolla, standard tranny. The engine speed lowering while
parked and turning the steering is normal, you are using the power
steering which is running off the engine. Turning the steering parked is
very very hard to do without power (try it, turn the engine off and try
turning the steering with the wheel unlocked).

I have noticed my corolla will drop a few rpms before the computer kicks
it up a notch whenever a electrical load comes on, such as the radiator
fan or the stereo, or lighting turning on. The computer always brings it
back to normal though.

Another thought, check your vaccumn hoses with all the mucking around you
have had done, something has bound to have gotten knocked off.

DRACO-

--
In order to bend the spoon, you have to first
realize you are holding a butterknife!

To email me remove .not as it is an invalad TLD

"Nick Trounson" <nodisclose (AT) iie (DOT) com> wrote

Hi Nick

I made a trip to my local Toyota dealer and asked for some sparkies for my
Corolla and they passed me some Denso plugs to suit. I've installed the
plugs and they seem to be doing a much better job than the Bosch plugs that
were in there.

Bit of a price difference too - Bosch Super 4 plugs were approx AU$10 each,
Denso plugs AU$3.60 each.

Wonder if the NGK Iridiums would work as they should?

Thanks again for your help.

Paul

On Mon, 26 Apr 2004 15:24:47 +1000, "Paul C"
<pdc (AT) nospamthanks (DOT) yahoo.com> wrote:


I found a few in the past with idle problems. I felt under each
vacuum hose and usually found a air leak. New hose cleared up the
problem.

Corollafan

"Corollafan" <corollafan (AT) aol (DOT) com> wrote

Corollafan,

Would this connect to the PCV valve? I found giving a PCV valve an air clean
appeared to help.

Cheers
Paul

Ok guys more developments:

* Car still doesn't idle properly - slowly returning to how it used to idle
* When taking a close look at the rpm needle it does slightly move up and
down and is definetley not hovering "steady"

* The car is using oil a fair bit.... (low level after oil change that is
changed to the top level will happen after 2000 kms of driving roughly)

Could the oil usage and this rough idle be related to the PCV valve? I don't
know when it was last changed (only had the car 6 months or so)

Is it possible to clean a Corollas PCV valve rather than replace it?

I have a second Corolla I am going to "borrow" the PCV valve from to check
if there is a difference using it (it seems to idle ok but does stall every
now and then, and its an automatic).

Cheers
Paul

"Paul C" <pauldcook (AT) yahoo (DOT) com> wrote