340 Too Rich - Page 2

Clan · Jan 22nd, 2009, 09:52

[QUOTE=340_Chris;452489]Yes, when the throttle was pressed the fuel came out of the jets in a thin stream - which I assume is how it's supposed to be yes?

QUOTE]

Yes thats ok then :-)

pettaw · Jan 25th, 2009, 12:10

If you find its running very much too rich all the time, it may well be the float chamber flooding, or level set too high. I'm sorry I don't have the correct spec to hand, but it should be in any workshop manual.

This is a 1.4 right? OK the float arm should be gently touching the ball bearing/damper on the needle, gently closing the needle, rather than pressing it hard. The best way I've found is to get a drill bit that's the specified width and run that underneath the float to gauge the gap rather than trying to judge it by eye.

340_Chris · Jan 27th, 2009, 14:21

Thanks for the extra help guys. I'm afraid that things have gone from bad to worse :-(

Shortly after leaning the mixture off I did a long drive (about 120 miles on the motorway) and everything seemed fine. The return journey, however, was rather different. I was forced to stop every 35 miles or so to clean off the plugs because they were getting so sooty (bear in mind I was sticking to between 65 and 70 MPH - so not ragging it or anything). It looks like it's definately running far too rich all the time now so I'm going to have to resort to the trains for a couple of weeks :-/

I've managed to source a spare carb at a scrappy and so it would probably be prudent to refurbish it - does anyone know where I can get a kit for the weber carb from?

Many thanks.

Chris

Chris_C · Jan 27th, 2009, 16:55

Rather than copy all the info out, I'm going to linky you to a helpful thread on V3M!

http://www.volvo300mania.com/forum-u...php?f=6&t=6203

foggyjames · Jan 29th, 2009, 22:38

I was gonna say....for a quick fix, just swap out the carb while you rebuild the original at your leisure. That's almost certainly the cause of your problem.

cheers

James

pettaw · Jan 31st, 2009, 00:20

Even quicker, and completely free, is to check that float height.....its absolutely crucial to the running mixture.....

340_Chris · Feb 6th, 2009, 19:05

Hello again everybody. I've got a second-hand carb which is currently lying in a bath of WD40.

I gave it a very quick look over the other day and was a bit puzzled by the butterflys on the bottom of it. One opens freely when you engage the throttle (which I presume is the primary one) but there's another which doesn't move at all - whichever part of the throttle/choke I move around. Is this correct or is this second butterfly supposed to move too?

Cheers.

Chris

p.s. I've had the refurb kit through so I can crack on with doing the original carb in the meantime.

Clan · Feb 6th, 2009, 19:19

the secondary larger throttle should start to open about 60 % of full throttle then at the full stroke of the throttle lever on the carb both should be fully open .. You DO have a weber 32 DIR Variant? Should be stamped on the edge of the lower mounting flange ...

340_Chris · Feb 6th, 2009, 19:28

That's right - it says 32DIR104.

The two throttle valves look the same size. The primary one opens about 80 % but the secondary one doesn't open at all. It looks like the shaft going through the secondary one is connected to some kind of diaphragm by a thin shaft.

340_Chris · Feb 6th, 2009, 19:37

In the photo the top throttle valve is opening but the lower one isn't. Am I getting confused about which bit is which?

Jan 22nd, 2009, 09:52	#11
Clan Experienced Member Last Online: Yesterday 23:20 Join Date: Jun 2007 Location: L/H side	[QUOTE=340_Chris;452489]Yes, when the throttle was pressed the fuel came out of the jets in a thin stream - which I assume is how it's supposed to be yes? QUOTE] Yes thats ok then :-) __________________ My comments are only based on my opinions and vast experience .

Jan 27th, 2009, 14:21	#13
340_Chris New Member Last Online: Dec 3rd, 2014 17:25 Join Date: Jan 2009 Location: Malvern	Bad Times Thanks for the extra help guys. I'm afraid that things have gone from bad to worse :-( Shortly after leaning the mixture off I did a long drive (about 120 miles on the motorway) and everything seemed fine. The return journey, however, was rather different. I was forced to stop every 35 miles or so to clean off the plugs because they were getting so sooty (bear in mind I was sticking to between 65 and 70 MPH - so not ragging it or anything). It looks like it's definately running far too rich all the time now so I'm going to have to resort to the trains for a couple of weeks :-/ I've managed to source a spare carb at a scrappy and so it would probably be prudent to refurbish it - does anyone know where I can get a kit for the weber carb from? Many thanks. Chris

Jan 27th, 2009, 16:55	#14
Chris_C Gopher Last Online: Oct 12th, 2023 15:31 Join Date: Dec 2003 Location: Southampton or Isle of Wight View Photos By: Chris_C	Rather than copy all the info out, I'm going to linky you to a helpful thread on V3M! http://www.volvo300mania.com/forum-u...php?f=6&t=6203 __________________ 2003 S60 D5 SE 1989 340GL - Fake - Gallery Project Thread - Spare parts car turned motorsport plaything. 8 more valves, 277 more cc's Previously, a lot of various 300s

Jan 29th, 2009, 22:38	#15
foggyjames 300 Register Keeper Last Online: Yesterday 11:06 Join Date: Dec 2001 Location: Nottingham	I was gonna say....for a quick fix, just swap out the carb while you rebuild the original at your leisure. That's almost certainly the cause of your problem. cheers James __________________ VOC 300-series Register Keeper '13 V70 D4 SE Lux '89 740 Turbo Intercooler '88 360 Turbo Intercooler '84 360 GLT '81 343 GLS R-Sport '79 343 DL '70 164

Feb 6th, 2009, 19:05	#17
340_Chris New Member Last Online: Dec 3rd, 2014 17:25 Join Date: Jan 2009 Location: Malvern	Scrappy Carb Hello again everybody. I've got a second-hand carb which is currently lying in a bath of WD40. I gave it a very quick look over the other day and was a bit puzzled by the butterflys on the bottom of it. One opens freely when you engage the throttle (which I presume is the primary one) but there's another which doesn't move at all - whichever part of the throttle/choke I move around. Is this correct or is this second butterfly supposed to move too? Cheers. Chris p.s. I've had the refurb kit through so I can crack on with doing the original carb in the meantime.

Jan 25th, 2009, 12:10	#12
pettaw Forum Support Team Last Online: Jul 23rd, 2023 15:29 Join Date: Jan 1970 Location: Glasgow, London	If you find its running very much too rich all the time, it may well be the float chamber flooding, or level set too high. I'm sorry I don't have the correct spec to hand, but it should be in any workshop manual. This is a 1.4 right? OK the float arm should be gently touching the ball bearing/damper on the needle, gently closing the needle, rather than pressing it hard. The best way I've found is to get a drill bit that's the specified width and run that underneath the float to gauge the gap rather than trying to judge it by eye.

Jan 31st, 2009, 00:20	#16
pettaw Forum Support Team Last Online: Jul 23rd, 2023 15:29 Join Date: Jan 1970 Location: Glasgow, London	Even quicker, and completely free, is to check that float height.....its absolutely crucial to the running mixture.....

Feb 6th, 2009, 19:19	#18
Clan Experienced Member Last Online: Yesterday 23:20 Join Date: Jun 2007 Location: L/H side	the secondary larger throttle should start to open about 60 % of full throttle then at the full stroke of the throttle lever on the carb both should be fully open .. You DO have a weber 32 DIR Variant? Should be stamped on the edge of the lower mounting flange ... __________________ My comments are only based on my opinions and vast experience .

Feb 6th, 2009, 19:28	#19
340_Chris New Member Last Online: Dec 3rd, 2014 17:25 Join Date: Jan 2009 Location: Malvern	That's right - it says 32DIR104. The two throttle valves look the same size. The primary one opens about 80 % but the secondary one doesn't open at all. It looks like the shaft going through the secondary one is connected to some kind of diaphragm by a thin shaft.

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