Volvo AWD 850 Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 7/2004 850 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Rough Idle Solution Possibility 850

posted by  850 owner on  Thu Apr 8 09:25 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Sun Sep 2 21:30 CST 2012
[RELATED]

Hi all ---

I have read many posts about rough idle on the 850. I recently had the rear main seal replaced by a local Ind. Tech. The seal job was wonderful, and the engine was re-installed perfectly. However, I had a pronounced rough idle after getting the car back. Before taking it back, I checked out all the vacuum hoses and fittings. All looked good. The car still had a bad idle. Cleaned out IAC motor. Still rough. Tried new tank of gas. Still rough. Finally took it back to the ind. tech., he opened the hood and ran through all the hoses. Ends up that two hoses going to the solenoid that sits on top of the radiator were reversed. Idles silky smooth now. Lesson I learned is that before replacing hoses and the like, MAKE SURE all vacuum hoses are routed to their proper destination. A purple and two yellow lines go to the solenoids on top of the radiator. The tech explained to me that if the light yellow and dark yellow hoses are reversed, you'll get a rough idle. I think it was the light yellow/white hose on the bottom and dark yellow on top. Pehaps this will help someone. Good luck!
--
'94 854 N/A.







<< < > >>



©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.