The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

High idle... sometimes 200 1991

posted by  Supergoose9 on  Sat Feb 1 18:45 CST 2014
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Thu Oct 23 22:43 CST 2014
[RELATED]

I'm trying to work through some idle issues. At this point I'm all self-taught using the Bentley and reading the Brickboard. Thanks for any help you can provide.

Here are the symptoms:
-On a cold start (I haven't checked a warm restart) the rpms rev to about 1500 and then settle back towards 750-800. I say settle towards because the trip from 1000 to 800 seems to take quite a while, 15 seconds or more. Afterwards the car idle is steady at about 800.
-This behavior continues as the car warms up. When I put the clutch in, the idle settles but slowly.
-Here is the confusing bit. When the car is warm and idling at a stoplight for about a minute, the idle speed will increase smoothly to about 1000 rpm and stay there.
-Wherever the idle is, it seems consistent. It does not dip and surge every few seconds or anything like that.
-The car starts, drives and runs well otherwise.

Here is what I've done:
-Checked for vacuum leaks. Everything looks good to me, but being a bit of novice I could be missing something.
-Check for codes in both 2 and 6. 1-1-1 from both.
-Cleaned the IAC valve. It did it when I was in doing the breather box and intake manifold gasket a few weeks ago.
-Tested the IAC. The lowest ohm reading I could get was 9.4 ohm, which is a little high according to the Bentley. (Too high?) I also applied battery voltage to it and it seems to move open and closed easily. (Protip: Use something to keep your test clips from falling together on the IAC. :)
-Swapped in a clean junkyard IAC which was actually worse than the original.

My questions:
-I read somewhere (the FAQ maybe) that dirt at the IAC connector could cause something like this. Anyone have experience with this? How do people clean their electrical connections?
-Should I be chasing something other than the IAC? If so what?
-I've got EGR. Does the EGR valve contribute exhaust to the intake at idle? Could a leaky EGR valve give these symptoms?
-I remember a post recently about a cheap aftermarket IAC, but I can't find it. Anyone remember? Maybe I'll need it.

Thanks,
Spencer





USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.