Volvo RWD Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 4/2008

[<<]  [>>]


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

loss of vacuum ?-> no ignition

uid 18083's pic
posted by  lucid on  Fri May 7 04:52 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I read Stuart's description as a misunderstanding of the basic (i.e., normal) Fuel—Ignition relationship, which is:

1) Fuel relay MUST be energized to run pumps

2) Fuel relay will NOT energize (when cranking) till it gets a ground on 86/2 via ECU 21

3) ECU will NOT provide pin 21 ground till it gets Pin 1 ignition OK from EZK 17

I think it's best to check that basic operation first. A quick check for spark at the plugs is a good place to star, IMO.

His "running pumps" may be the 2-second Key ON buzz (enough to put pressure to the rail).

And the relay he sees "switching" may well be the Main, not the Fuel relay—something the fools many first timers.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New loss of vacuum ?-&gt no ignition
posted by  stuartbaker  on Thu May 6 08:06 CST 2004 >


<< < > >>



©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.