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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

My Continuing Search for 50ish rpm idle fluctuation 700

posted by  vinraz on  Fri Nov 1 20:59 CST 2002
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Wed Jan 11 13:25 CST 2012
[RELATED]

I am going nuts and losing my patience chasing this idle fluctuation. I have throughly cleaned out TB, including section that contains the adjustment knob,
along with new gaskets. TPS is properly adjusted. Last sunday night I disassembled the IAC and thoroughly clean it. Plugged connector to it, while I plugged both IAC hoses to check for correct operation of it as I opened and closed throttle. IAC still a bit sticky opening and closing. Purchased new one from Groton. Installed yesterday. Idle quality and smoothness has improved, but RPM up/down cycling still present.
Big turbo hoses are less than a year old. I have checked other hoses for vacuum leaks and found none. Injectors cleaned and tested this summer and installed with new seals. Car (89 745,129K, meticulously maintaned) runs great except for this.
What to check next? I am going to removed and surgically inspect each vacuum hose. I read in the archives of same problem solved by changing the intake man.
gasket. Also an earlier post yesterday mentioned fuel pressure reg.
Possible BIG hint: car idles silky smooth when cold. When operating temp is reached idle quality declines.
Any one have any suggestions on what could be causing this? Thanks for any help in advance and also for all great advice I've received in the past.






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.