Engine: 2.1 Carb B21A: - Rough idle (which one doesn't!!)

Scott Stephen · Sep 26th, 2006, 22:01

Hi all

My '75 244 has the Stromberg CD175 carb fitted. Off idle she runs like a dream, at idle it's very lumpy. The car did this when i got it and i have replaced every single ignition component, replaced fuel pump and filter, inlet, exhaust and head gasket all new, timing set for unleaded (no pinking evident) and stripped and rebuilt the carb....to no avail. I know that from experience that getting a carb'd Volvo to run A1 is a task and a half but i'd like a more pleasant idle. Can anyone help???????????

thanks

Mike_Brace · Sep 26th, 2006, 22:25

When rebuilding carb did you check butterfly spindle for wear - this can let air past. Has it got the anti-diesel solenoid on it? This if faulty can restrict idling.

Mike

Scott Stephen · Sep 27th, 2006, 22:00

hi, what does this solonoid look like and where would it be????

i cant recall seeing a solonoid

brynorpheus · Oct 4th, 2006, 00:38

i think you will find there is a rubber diaphram in the carb that splits, causing your problem, i had this on a 1979 240. known problem with carbs, just check i have the right carb. for this fault.
john

alsner · Oct 4th, 2006, 01:05

I'm pretty sure I had a SAAB 900 with one of those carbs, it had a rough idle that I couldn't cure, eventually the diaphram split totally causing failure on the A30. Replaced diaphram and the idle was sorted out at the same time. Could be wrong as it was 10 odd years ago now..

Ali

Sep 26th, 2006, 22:01	#1
Scott Stephen Senior Member Last Online: Apr 2nd, 2012 10:32 Join Date: Nov 2001 Location: aberdeen View Photos By: Scott Stephen	Rough idle (which one doesn't!!) Hi all My '75 244 has the Stromberg CD175 carb fitted. Off idle she runs like a dream, at idle it's very lumpy. The car did this when i got it and i have replaced every single ignition component, replaced fuel pump and filter, inlet, exhaust and head gasket all new, timing set for unleaded (no pinking evident) and stripped and rebuilt the carb....to no avail. I know that from experience that getting a carb'd Volvo to run A1 is a task and a half but i'd like a more pleasant idle. Can anyone help??????????? thanks __________________ Volvo 244 (BREAKING),240,850 + Rover 800 Vitesse + Reliant SuperRobin!!!!

Sep 26th, 2006, 22:25	#2
Mike_Brace Former contributor Last Online: May 15th, 2024 09:52 Join Date: Dec 2004 Location: Rhosgoch, Anglesey	When rebuilding carb did you check butterfly spindle for wear - this can let air past. Has it got the anti-diesel solenoid on it? This if faulty can restrict idling. Mike __________________ A Volvo is for life not just for Christmas!

Sep 27th, 2006, 22:00	#3
Scott Stephen Senior Member Last Online: Apr 2nd, 2012 10:32 Join Date: Nov 2001 Location: aberdeen View Photos By: Scott Stephen	hi, what does this solonoid look like and where would it be???? i cant recall seeing a solonoid __________________ Volvo 244 (BREAKING),240,850 + Rover 800 Vitesse + Reliant SuperRobin!!!!

Oct 4th, 2006, 01:05	#5
alsner In Volvo limbo Last Online: Aug 4th, 2013 03:26 Join Date: Feb 2006 Location: At home View Photos By: alsner	I'm pretty sure I had a SAAB 900 with one of those carbs, it had a rough idle that I couldn't cure, eventually the diaphram split totally causing failure on the A30. Replaced diaphram and the idle was sorted out at the same time. Could be wrong as it was 10 odd years ago now.. Ali __________________ Volvo History 1990 745 GLE (10 months) 1989 745 Turbo (16 months) I will return to the fold when the time is right. *It's Just a Ride* Bill Hicks

Oct 4th, 2006, 00:38	#4
brynorpheus BRYNORPHEUS Last Online: Apr 18th, 2022 13:45 Join Date: Aug 2006 Location: brynmawr gwent	i think you will find there is a rubber diaphram in the carb that splits, causing your problem, i had this on a 1979 240. known problem with carbs, just check i have the right carb. for this fault. john

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