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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

94 940T fuel mixture is lean and fan runs at cold start after head gasket job 900 1994

posted by  walczyk on  Thu May 1 15:03 CST 2014
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon May 12 14:20 CST 2014
[RELATED]

We replaced both temperature sensors ones from a spare engine because the dash gauge never worked right. We fixed the gauge but got this starting issue. Car runs fine once started and can be restarted normally when engine is warm. I bet I swapped some wires or a connection is bad. My dad re-swapped the temp sensors as well.

Maybe the ECU is getting no temperature signal? I don't know what sort of limp mode it goes into when the temp sensor is unplugged. I should find a wiring diagram of the system, that would be the most logical thing to do.

tl;dr just replaced head gasket, fan turns on right away, fuel mixture is lean from cold start; the car thinks the engine is hot.

Has anyone experienced this, or does anyone know what wiring connecting the temperature gauge to the ecu that I may have messed up during the head gasket job?






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.