Volvo RWD 700 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 10/2021 700 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

Ignition Module problem 700

posted by  rwreagan on  Sun Sep 19 12:39 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Sun Aug 14 15:41 CST 2011
[RELATED]

'90 740 GLE 16-valve engine shows all the classic symptoms of a failing ignition module, per the FAQ. Car runs fine and suddenly the engine quits with no warning. After a rest period, it cranks fine.

Two questions: 1) I'm assuming a high probability that it's the ignition module. Before I spring for the cost of a new one, what are the chances that it could be something else? Is there a way to verify that it's the module?

And 2) FCP Groton has a Bosch ignition module with the same part number showing on mine for $65. They also show an aftermarket brand (HUGO) for $39. Is there any reason to spend the extra $$$ for the Bosch unit?

Thanks for any and all comments and suggestions.

Robert








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    Ignition Module problem 700

    posted by  Bill Bretherton on  Mon Sep 20 01:22 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Wed Oct 22 12:52 CST 2014
    [RELATED]

    When it quicks watch the tach. If it drops suddenly it's either the RPM sensor or the ignition module or the power stage. Then, try cranking and listen for fuel pumps. If silent, it's likely the RPM sensor. If pumps run it could be the module, but it could also be the power stage IMO. The power stage will have a square wave going into it if the module is working - but that needs test equipment i.e. a scope. In this case the power stage is faulty (assuming tach is dead). Regards.
    --
    BillB








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    Ignition Module problem 700

    posted by  porkface on  Sun Sep 19 14:40 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 09:12 CST 2014
    [RELATED]

    when the car stalls, have someone crank it while you hold an injector in your fingers. if the car has no spark but you feel the injectors opening, it needs a module. if the injectors don't open, plus you have no spark, then you the speed sensor on the top of the trans.

    spend the money, the hucos are junk. you'll be buying another module in less than a year. good luck, chuck.







<< < > >>



©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.