Slight hiccup when cold.
Discussion
Was just wondering if anyone could shed any light on a very slight problem I have. My car has a hiccup at bery slight throttle openings when engine is still warming up. By slight throttle openings I mean pottering in traffic between 20 and 40 mph for example and it only does it when car is still warming up, its fine when it gets up to normal running temp. Also when you give it some juice it picks up straight away with no problem it is only when I am hardly touching the hot pedal. I dont think its anything serious but if anyone has any ideas on how to cure this irritation would be pleased to hear them.
Cheers,
Carl.
Cheers,
Carl.
That's the only problem you have?
Fuelling of engines durimg warm-up is extremely difficult to get absolutely right, and if it was me, I'd be happy that it runs ok the rest of the time. I think that the only cars I have ever had that have run properly before they were warm, were all diesels.
My S runs like a dog when it's cold, although it's fine if I leave it for a minute or two before driving off.
It was a lot worse, until I replaced the Idle Speed Control Valve and the throttle pot. Assuming you're talking about an S (your profile suggests you don't have one yet) then if you really want to play with it, then you could clean out the ISCV (remove it and wash out with carb cleaner, including the drillings from the valve through the throttle body), clean the connectors to that and to the throttle pot, and also (because it may be a caused by the change over from idle air bleed to main throttle opening) wash down the throttle butterflies and spindles. Watch for air leaks round the throttle butterfly spindles where they pass through the throttle body (drip some Redex on the outside and see if it's sucked in) which would weaken the mixture at very small throttle openings.
Personally, if it runs fine when warm, I'd leave it alone.
>> Edited by tvrgit on Thursday 14th July 21:12
Fuelling of engines durimg warm-up is extremely difficult to get absolutely right, and if it was me, I'd be happy that it runs ok the rest of the time. I think that the only cars I have ever had that have run properly before they were warm, were all diesels.
My S runs like a dog when it's cold, although it's fine if I leave it for a minute or two before driving off.
It was a lot worse, until I replaced the Idle Speed Control Valve and the throttle pot. Assuming you're talking about an S (your profile suggests you don't have one yet) then if you really want to play with it, then you could clean out the ISCV (remove it and wash out with carb cleaner, including the drillings from the valve through the throttle body), clean the connectors to that and to the throttle pot, and also (because it may be a caused by the change over from idle air bleed to main throttle opening) wash down the throttle butterflies and spindles. Watch for air leaks round the throttle butterfly spindles where they pass through the throttle body (drip some Redex on the outside and see if it's sucked in) which would weaken the mixture at very small throttle openings.
Personally, if it runs fine when warm, I'd leave it alone.
>> Edited by tvrgit on Thursday 14th July 21:12
Yep mine did that, but when I sorted out the mixture it stopped, I know the ECU sorts out the mixture and you shouldn't play about with it but when you supply a German Ford Scorpio engine and then put a South African Ford Taunus ECU in it, don't tell me it is all perfect and the old Ford mechamics all know how to get past the ECU and sort it out anyway.
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