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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

AMM ??? Hall Sensor??? Intermittant problem... 700 1987

posted by  Old 740 on  Tue Dec 21 12:50 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

Dan, I am having the same exact problem with my '86 740. The car always starts and idles fine but after about 5 minutes on the expressway it starts missing, not all the time but it's getting to be more and more of the time.

I reasoned that it was an ignition problem because the tack jumps around independent of the engine speed and the tach is electronic, driven off the ignition system. I replaced the distributor with a junkyard one and the problem remained. Still thinking it had to be the hall sensor, I replaced the hall sensor and the problem still persists. I have replaced the ignition module twice, the last time about a year ago. Both times the module failed the car would not start at all.

I have replaced the coil, plugs, wires, cap & rotor and hall sensor so far. I am beginning to wonder about what role the knock sensor plays with the ignition and if it might be sending a false signal to the ICU. I'm planning to swap out the ICU and knock sensor next and after that I can't imagine what is left.

Don't you just love intermittent problems?






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.