bad idle 440, please help

440anator · Sep 5th, 2009, 20:34

hey there

im jus wondering does anyone know how to fix or whats the cause of my erratic idle on volvo 440 1.7 carb, because when I'm driving along an i have pushed the choke all the way in the revs drop below 1000 rpm an it keeps makin the noise as if its gonna conk out i read in a haynes manual something about an idle screw? so i checked an i dont have one lol so these are my questions

can you buy "idle screws"? if so where please?

How would i fix the erractic/bad idle?

also i read somewhere on the forum about cleaning something near the carburaetor?

and lastly (sorry for all the questions lol) when i hav pushed the choke all the way in for eg on the motorway it keeps poppin out? why ?

thanks for taking time to read this

ahal · Sep 5th, 2009, 21:41

Idle control valve? Volvo do a good spray cleaner ( dear though ) ... apart from rising temp. erratic idle must be the most posted Volvo 440 matter lol ... I'll see what I can find

Eh, just a thought ... could the cable just be stiff? I found exactly the same as you're saying having not started my 460 for about a year!

ahal · Sep 5th, 2009, 21:49

http://www.volvoforums.org.uk/showth...440+rough+idle

http://www.volvoforums.org.uk/showth...440+rough+idle

http://www.volvoforums.org.uk/showth...440+rough+idle

http://www.volvoforums.org.uk/showth...440+rough+idle

I don't think this is a 440 engine, but re: cleaning the idle control valve ( I know there's a 400 series one ... somewhere ) : http://www.volvoforums.org.uk/showth...ing+idle+valve

GTMaster · Sep 6th, 2009, 18:27

I don't think the carb version has the same idle control valve as the efi version.

carb.1.jpg

Here is where you can change the idle.

ahal · Sep 6th, 2009, 18:40

Very good I didn't go through each thread before I posted.

GTMaster · Sep 6th, 2009, 19:06

I'd first check the following: whether turning the idle control screw changes the idle, the flap before the air filter is in the correct position and whether the idle control valve opens or not.

2_20_29__18.jpg
Top picture shows at what temp. must the flap move
2_20_29__23.jpg
Third picture from top shows the idle control jet
2_20_29__29.jpg
Shows how to change the idle and CO

440anator · Sep 6th, 2009, 20:26

thanks guys but i cant seem to find the screw? i mean the idle screw, can u buy them sumwer? mine must hav been taken out

GTMaster · Sep 7th, 2009, 21:53

You could try asking for one separately but i'd doubt you'll get one. Try a scrapyard and ask for just the screw off a used carb. Hope they wouldn't charge you for the whole carb though...

440anator · Sep 8th, 2009, 19:12

hi
it turns out ther is an idle screw was jus covered in gunk lol
so i'll give her a clean this weekend an see how she goes btw can i ask wen im adjustin the idle, do i have the engine running with the choke all the way in?

thanks again guys

GTMaster · Sep 8th, 2009, 22:27

Yes, you can only adjust the idle when the running engine is warm and when the choke is pushed in.
I found it surprising that you said there wasn't an idle control screw: i was thinking how on earth would it be working at all

Sep 5th, 2009, 20:34	#1
440anator rookie Last Online: Apr 29th, 2015 18:57 Join Date: Apr 2009 Location: n ireland =] is be wer it at	bad idle 440, please help hey there im jus wondering does anyone know how to fix or whats the cause of my erratic idle on volvo 440 1.7 carb, because when I'm driving along an i have pushed the choke all the way in the revs drop below 1000 rpm an it keeps makin the noise as if its gonna conk out i read in a haynes manual something about an idle screw? so i checked an i dont have one lol so these are my questions can you buy "idle screws"? if so where please? How would i fix the erractic/bad idle? also i read somewhere on the forum about cleaning something near the carburaetor? and lastly (sorry for all the questions lol) when i hav pushed the choke all the way in for eg on the motorway it keeps poppin out? why ? thanks for taking time to read this __________________ Have you ever seen a Volvo with tha butterfly doors

Sep 5th, 2009, 21:41	#2
ahal Master Member Last Online: May 30th, 2015 05:21 Join Date: Nov 2004 Location: Wicklow	Idle control valve? Volvo do a good spray cleaner ( dear though ) ... apart from rising temp. erratic idle must be the most posted Volvo 440 matter lol ... I'll see what I can find Eh, just a thought ... could the cable just be stiff? I found exactly the same as you're saying having not started my 460 for about a year! __________________ www.volvo400.com Last edited by ahal; Sep 5th, 2009 at 21:51.

Sep 5th, 2009, 21:49	#3
ahal Master Member Last Online: May 30th, 2015 05:21 Join Date: Nov 2004 Location: Wicklow	http://www.volvoforums.org.uk/showth...440+rough+idle http://www.volvoforums.org.uk/showth...440+rough+idle http://www.volvoforums.org.uk/showth...440+rough+idle http://www.volvoforums.org.uk/showth...440+rough+idle I don't think this is a 440 engine, but re: cleaning the idle control valve ( I know there's a 400 series one ... somewhere ) : http://www.volvoforums.org.uk/showth...ing+idle+valve __________________ www.volvo400.com

Sep 6th, 2009, 18:40	#5
ahal Master Member Last Online: May 30th, 2015 05:21 Join Date: Nov 2004 Location: Wicklow	Very good I didn't go through each thread before I posted. __________________ www.volvo400.com

Sep 6th, 2009, 20:26	#7
440anator rookie Last Online: Apr 29th, 2015 18:57 Join Date: Apr 2009 Location: n ireland =] is be wer it at	thanks guys but i cant seem to find the screw? i mean the idle screw, can u buy them sumwer? mine must hav been taken out __________________ Have you ever seen a Volvo with tha butterfly doors

Sep 6th, 2009, 18:27	#4
GTMaster Senior Member Last Online: Nov 7th, 2016 22:32 Join Date: Sep 2008 Location: Melbourne	I don't think the carb version has the same idle control valve as the efi version. carb.1.jpg Here is where you can change the idle.

Sep 7th, 2009, 21:53	#8
GTMaster Senior Member Last Online: Nov 7th, 2016 22:32 Join Date: Sep 2008 Location: Melbourne	You could try asking for one separately but i'd doubt you'll get one. Try a scrapyard and ask for just the screw off a used carb. Hope they wouldn't charge you for the whole carb though...

Sep 8th, 2009, 19:12	#9
440anator rookie Last Online: Apr 29th, 2015 18:57 Join Date: Apr 2009 Location: n ireland =] is be wer it at	hi it turns out ther is an idle screw was jus covered in gunk lol so i'll give her a clean this weekend an see how she goes btw can i ask wen im adjustin the idle, do i have the engine running with the choke all the way in? thanks again guys __________________ Have you ever seen a Volvo with tha butterfly doors

Sep 8th, 2009, 22:27	#10
GTMaster Senior Member Last Online: Nov 7th, 2016 22:32 Join Date: Sep 2008 Location: Melbourne	Yes, you can only adjust the idle when the running engine is warm and when the choke is pushed in. I found it surprising that you said there wasn't an idle control screw: i was thinking how on earth would it be working at all

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