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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Loss of power at speed - at a loss what to test/replace next 700 1989

posted by  Matt Campbell on  Fri Nov 14 10:30 CST 2003
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

Hello,

I've got an intermittent problem that is becoming very frustrating. The car is a 740 Turbo. When in gear and cruising along, the engine loses power momentarily as if a loss of fuel pressure. This is accompanied by a slow drop in rpms. Bliping the gas pedal will get the car to recover, usually with a spike in rpms. Sometimes giving light pressure on the gas pedal will not cause the rpms to go higher but you will see the boost gauge go higher. I've cleaned the TB, replaced the TPS, cleaned the IAC, also the car recently had both fuel pumps replaced along with the FP relay. The power loss never occurs with the car is in park. On another Brickboarder's suggestion I've tried two different replacement AMMs (one extra that came with the car and same part number AMM from my '87 240), and neither one affected the condition. Could this be some freaky intermittent ECU failure? I've also read that a fault voltage regulator will do weird stuff like this also. Any suggestions on what to test or replace next?

Matt Campbell
'89 740 Turbo wagon






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.