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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Rough idle on cold days with 'lukewarm' engine 200 1993

posted by  TMJ on  Mon Feb 21 19:43 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

My '93 245 has a rough idle problem on cold days - starting at about 20 F, getting worse as temperature drops.

Startup and initial driving are fine, but after about 5 minutes of driving (usually at a stoplight on my drive to work), the idle surges about once per second. On very cold days it may actually kill the engine. After the car is warmed up fully, the problem seems to go away.
Also, if I place the car in Park and take my foot off the brake, the surging will dampen out and the car will idle normally.

I recently replaced plugs, wires, cap, rotor, airfilter, cleaned TB, and replaced flame arrestor. There has been no change in this surging problem. At least there are no check engine lights!

The heated air intake hose has been removed (rusted away), but the airbox port is still open.

One strange thing I discovered is a disconnected brace between the left motor mount and the intake manifold. This brace also has the IAC connected to it. A previous owner / shop must have reinstalled the intake manifold with the strut misplaced, then ignored the mistake. I think there's more engine movement because of this, and it also messes up the routing of the IAC and AMM ductwork. I'll fix it if/when I remove the intake manifold. Could this loose brace be related to the surging?

I'm thinking it's most likely related to the brake booster. Any ideas / explanations out there?

Thanks!






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.