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740 brakes affecting idle?

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Old Jun 27th, 2010, 23:35   #11
grass hopper
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Are these easy to do? i mean i'm generally a little knowledgeable of cars, i change oil, filters and plugs, glow plugs, bulbs etc, most easily manageable tasks. Where can i get injector seal kits from?
very easy,with a little twist pull up on the injector (not the pipe)and it will pop out there is a large O ring that slides on,and there's also a small one in the plastic housing were the injector fitted,remove the bolt and twist this out and the seal will be visible.

the mixture/co will need resetting afterwards when the engine is hot,then try again from cold,the seals should be available from Volvo.
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Old Jun 28th, 2010, 00:39   #12
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the engine is the 'B200E' (2.0 , continuous injection, with no catalytic converter, it runs on lead replacement petrol, but would be nice if i could get hold of real leaded fuel.
This engine can run on unleaded without any problems. It will already have hardened valve seats and with no ignition adjustment required.

I am assuming it is a 1988 740 from your user name.
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Old Jun 30th, 2010, 15:17   #13
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very easy,with a little twist pull up on the injector (not the pipe)and it will pop out there is a large O ring that slides on,and there's also a small one in the plastic housing were the injector fitted,remove the bolt and twist this out and the seal will be visible.

the mixture/co will need resetting afterwards when the engine is hot,then try again from cold,the seals should be available from Volvo.

Great stuff, i'll look into getting a set of injector seals for it, how is the CO/Mixture adjusted? Is this something to do with the large black plastic screw protruding from the throttle housing? is this something i can do myself?
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Old Jun 30th, 2010, 15:18   #14
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This engine can run on unleaded without any problems. It will already have hardened valve seats and with no ignition adjustment required.

I am assuming it is a 1988 740 from your user name.
yes, its a 1988 model
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Old Jun 30th, 2010, 16:01   #15
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Great stuff, i'll look into getting a set of injector seals for it, how is the CO/Mixture adjusted? Is this something to do with the large black plastic screw protruding from the throttle housing? is this something i can do myself?
the large plastic screw is to alter the idle speed only,you will need a garage with a co machine to correctly set the mixture.
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Old Jun 30th, 2010, 19:30   #16
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pumping the brake pedal will obviously affect tickover as each pump lets air into the inlet manifold which will affect the mixture,by the sound of things yours is running rich on tickover if the chugging is better when you pump the pedal

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hello all,

I've noticed that when my car is cold it will idle up and down at 500 rpm and 'chug' once warmed up it will run perfect...however i've noticed if i pump the brake pedal quickly on idle that same chugging returns and i assume when brake vacuum rebuilds again, the idle smooths out once again.....should there be a non return valve on the vacuum pipe between the manifold and the master cylinder?
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