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Re: Air Bleed Valves (archive)
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Posted by ian M635 UK on October 15, 2001 at 04:34:52:

In Reply to: Re: AIr Bleed Valves posted by Rod... on October 14, 2001 at 03:43:54:


When I did mine I had to get a COMBINED CO2 reading at the exhaust outlet as mine does not have individual port bolts for each cylinder. CO2 reading AFTER cleaning the air bleed valves was about 2%. Prior to cleaning C02 was 4.35% - way too high. My car has no 02 sensor nor cat - pleasures of a Euro unrestricted car. I went through the route of spark plugs (old ones were OK) leads (3 were very poor) idle control valve (mine is a MECHANICAL device - again OK)before embarking on the bleed valves. Remember my bleed holes were very badly clogged up. You can check yours without removing them if you remove the air box (20minute job) and then shine a tourch down the bleed valve holes prior to the throttle plate. If they are clean then your poor idle is likely to be something else. If they are clogged up then this is likely to be the cause as you state your caps are there - this means no-one has touched them before.

Happy to discuss further so email if required.

Best of luck

Ian

O.K. I'm an Idiot. How do you get the air bleed valves (needle valves?) out so you can clean the air bleed ckt.? I've broken one of the little yellow caps trying to fugure out how to get them out. I'm trying to perform a procedure that Ian mentioned for smoother idling when engine how.
Thanks.

If you are attempting to remove the caps on the air balance screws, the only way to remove the caps is to break them.
They are tamper resistant caps.
You will need to buy new caps.
Have you used a vacuum gauge to determine if the throttle bodies are unbalanced?
Once you go down the road of adjusting the balance screws you will want a gas analyzer to check the CO at each cylinder. That is what the ports(bolts) are for on the header.
Good Luck...
Poor Idle!!
Is your engine running closed loop at idle?
Have you set the open loop idle speed?
Have you replaced your plugs within 15K miles?
Have you tested your injuctors to make sure none of them leak and that they have reasonabily balanced. flow.




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