Volvo RWD 700 Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 6/2010 700 INDEX

[<<]  [>>]


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

turnign on heater causes rough idle 700 1991

posted by  msunkenb on  Thu Sep 20 08:40 CST 2007
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Wed Dec 3 15:44 CST 2008
[RELATED]

I have a 91 740 turbo and have noticed that when i turn on the heater/defroster it causes a poor idle.

when the heater is off the car idles very well. i have recently replaced most of the vacuum lines, the valve cover gasket, plugs(ngk) cap and rotor (bosch) and the wires (bogicord [sic]), air filter (mann)and i have also removed and cleaned the throttle body and the AMM.

i've owned it for about a year and it is a daily driver, it is running better now than it has to date.

the only issue is when i turn on the heater the idle starts to bounce between 600 and 900 and will somtimes drop below 500. when its off its a pretty solid 750.

does anyone have any idea about this? i am thinking it could be the voltage regulator on the altenator which is original or possiblya lousy connection fo the ground straps?

i do need a new blower motor as it makes a fair amoutn of noise.

thanks for the help

mike s






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New turnign on heater causes rough idle [700][1991]
posted by  msunkenb  on Thu Sep 20 08:40 CST 2007 >


<< < > >>



©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.