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I thought I had sorted it but theres a problem. Its a Pierburg 1B3 carbed 1043cc engine btw.
The car runs fine when cold but when it warms up the idle seems to drop and eventually it stalls. When it's revved its fine, it just idles very low and stalls. When I rev the engine there is a hissing noise coming from the idle speed boost valve and when it drops to idle the hissing stops, and it goes strange again. I'm not sure what noise it's meant to make and when but I think it might have something to do with the valve.
Anyone have any ideas?
Adam
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Last Edit: Nov 4, 2006 17:32:18 GMT by Adam
1997 TVR Chimaera
2009 Westfield Megabusa
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electronic ignition? check points rotor arm and so on if not
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 once again rocking with 1117cc and 4 gears! |
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 Is the carb mounted on a rubber block base? A lot of watercooled VW's have them and are prone to splitting. While the engine is running rock the carb to see if the hissing increases and the running gets worse.
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The hissing is definately coming from the idle speed boost valve, we can here it, but i'm not sure whether its supposed to be hissing or not and if it isnt, whether it could be causing the problem.
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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SteB
Posted a lot
Posts: 1,408
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Is the carb mounted on a rubber block base? A lot of watercooled VW's have them and are prone to splitting. While the engine is running rock the carb to see if the hissing increases and the running gets worse. Thats where I would start. Also, check every single vacuum hose for splits and perished bits. |
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Surely it wouldn't run fine when cold if it were a carb to manifold gasket problem?
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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air leak
new hoses and rubber block carb sits on
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2001 HONDA CT110 (NOT RCV)
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The thing is the hissing is coming from the unit itself, not the hoses around it, which makes me think its meant to happen.
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1997 TVR Chimaera
2009 Westfield Megabusa
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shouldnt hiss when idling only when revved like if air cleaner off any hissing when not revved is a leak
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2001 HONDA CT110 (NOT RCV)
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Thats exactly how it is, so it's nothing to do with the idle speed boost valve?
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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Idle speed boost valve? Do you mean the solenoid that screws into the carb with electrical connections? Any pics?
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Idle speed boost valve? Do you mean the solenoid that screws into the carb with electrical connections? Any pics? I'll get picture tomorrow probably unless I can find one on t'internet. Thanks Adam |
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1997 TVR Chimaera
2009 Westfield Megabusa
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hmm
those manifoldd to carb gaskets are prone to going, they're basically a metal block dipped in rubber. could also be a vaccum hose, one of mine wasnt on properly and it was hissing a bit and bogging down and allsorts
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v prone to warpage not only on polos
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2001 HONDA CT110 (NOT RCV)
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The manifold gasket is fine because it runs perfectly when cold.
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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I've just been out and fiddled with the hoses going into the valve and it all appears to work.
Next stop, adjust the idle unless anyone else has any other ideas?
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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When cold it idles perfectly.
Choke goes off and it won't idle at all.
When the engines properly warmed up it idles but very lumpily.
Any ideas?
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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I fiddled with the idle adjustment screw a bit more and it seems a bit better, although a little eratic. Now to see what its like when cold!
Adam
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1997 TVR Chimaera
2009 Westfield Megabusa
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Is the carb mounted on a rubber block base? A lot of watercooled VW's have them and are prone to splitting. While the engine is running rock the carb to see if the hissing increases and the running gets worse. 
