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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Volvo 440 Erractic Idle 400 1994

uid 35's pic
posted by  arno on  Wed Sep 10 22:02 CST 2003
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Dec 8 01:10 CST 2000
[RELATED]

Unfortunately this is one of the 'known' issues with the B18U.

The idle is controlled by a stepper motor that opens/closes the actual throttle valve (it doesn't uses a separate 'bypass' air valve). Perhaps your throttle position sensor is going bad, so the ECU has trouble determining the throttle position. Check the connections with a multimeter to see if the resistor values change smoothly or 'jump'..

But... The main issue with the single point injection system is that the injector is in front (above actually) the throttle butterfly. At very small throttle openings (idling and such) the fuel can condense on the butterfly and the engine gets a very erratic fuel mixture.

You can try removing the air pipe to the throttle body and see if there's any dirt on/around the throttle butterfly and clean it.

Bye, Arno.






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.