IPD sale Volvo Parts
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

Idle Issue

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

lcc014
Posts: 108
Joined: Mon Jul 05, 2010 5:41 pm
Year and Model: 855, 1995
Location: Boston
Has thanked: 0
Been thanked: 0
United States of America
lcc014

Idle Issue

Post by lcc014 » Tue Apr 16, 2019 2:19 pm

My 1995 855 NA exhibited idle issue since last summer. When I drive the car at low speed such as traffic jam or around city (below 40 mph), and then stop at traffic light. Car would sometimes, idle between 1000 and 850 rpm which is a bit higher than idle speed but below 1k rpm. If I put car in P and step on the gas pedal to rev. up the engine (while waiting for traffic light) to 2k rpm or above, and let go gas pedal, engine would idle back to normal speed ~850 rpm. If I rev. up the engine below 2k rpm, engine would not go back to regular idle speed (850 rpm). This does not happens all the time, only after I drive the car at slow speed for a brief period of time.

Any idea about this idle issue is appreciated.

Thanks,

Ching-Ho Cheng



User avatar
RickHaleParker
Posts: 2730
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 303 times
United States of America
RickHaleParker

Re: Idle Issue

Post by RickHaleParker » Tue Apr 16, 2019 3:05 pm

When was the last time you cleaned out the Idle Air Control valve?


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

lcc014
Posts: 108
Joined: Mon Jul 05, 2010 5:41 pm
Year and Model: 855, 1995
Location: Boston
Has thanked: 0
Been thanked: 0
United States of America
lcc014

Re: Idle Issue

Post by lcc014 » Tue Apr 16, 2019 7:08 pm

That was many years ago, probably more than 10 years. It is still the original IAC valve..... Do we know the size of those 2 metal clamps on each end of this IAC valve ? I was told that do not spray the carb. cleaner into IAC valve with hoses still connected to it. Carb. cleaner bad to those rubber air hoses ??

Thanks,

Ching-Ho Cheng



Post Reply