740 brakes affecting idle?
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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there is a cold start problem with the car,dependant on engine variant. |
Thank you guys, i checked and the vacuum is still there after the engine is turned off, even when left sitting over night so we know its not the check valve in this case...
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. I've noticed theres no 'engine light' does that mean theres no onboard diagnostics or fuel injection computer, or is this a purely mechanical system? Sorry for so many questions, this is my first volvo :-) |
Fairly normal for slightly rough idle when cold on these engines, any hot start issues?
No electronics for the injection on these engines, other than the cold start injector. |
hi fella - my B200e runs very happily on unleaded with no problems - Volvos were designed for Unleaded very early on so highly likely you can use premium unleaded - though of course they do prefer to run on the higher octane stuff and mine runs a lot happier on v-power - no issues other than that. Might save you a pretty penny and be easier to get hold of....
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first thing I would do is change the injector seals as these tend to leak and draw air causing poor idle,then the co will need adjusting after.
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No hot start issues whatsoever....its a bit of a strange one..... i'm now suspecting the idle air control valve...(auxillary air valve) |
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