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 

More testing at the Coil 700 1985

uid 18083's pic
posted by  lucid on  Fri Nov 9 23:41 CST 2007
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I 'd add that testing the coil – (negative) terminal with a +12V test light can also be helpful,

With the key on, a test light at the negative terminal should be bright (+12V "reading" thru from the + terminal).

If no light, either the coii is bad, OR there is no voltage at the + terminal. (further testing needed)

If the light is bright, it should go dim and pulsing when the engine is cranked. Failure to change from "bright" means the Ignition Control Unit (ICU) is not triggering the coil. (further testing needed)

NOTE: Looking at the Haynes diagrams (reluctantly), it seems that the '85 740 Ignition doesn't have a "Power Stage" as suggested above. The ICU triggers the coil directly, based on timing pulses from the distributor.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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.