6 replies to this topic

[benmuncey]

Hello, I have a 1992 British Open Classic Mini which usually drives great.  However, when starting the vehicle from cold I experience a loss of power when revving the engine whilst stationary (the revs drop right down to the point where it would stall).  Perhaps worth noting that when starting it idles very low (approx. 500rpm) which I usually correct by applying a little choke until the engine has warmed up- is this normal?  Once there is some heat in the engine it operates normally, idles at about 1000rpm and experiences no loss of power when accelerating.

 

Hopefully I've explained the problem clearly but happy to elaborate if more information is required.  Thanks in advance, Ben.

[FlyingScot]

I'm lost... You know you are supposed to use the choke when starting from cold? As apart from enriching the mixture a cam presses on the throttle connection on the carb.

When I had carbed minis - choke out full, start engine and gradually push in as it warms up, or am I missing something?

FS

Edited by FlyingScot, 11 September 2015 - 04:11 PM.

[dyshipfakta]

... That's what the choke is for.

[Tamworthbay]

... That's what the choke is for.

and hanging your handbag off of course, assuming you have one, cough, anyway let's be kind as these cars are not like modern ones so hopefully it's just a simple matter of a bit more choke or at worst a bit of a retune.

[chrisxr2]

Good actual grief. Try reading the owner's manual.

[FlyingScot]

Guys maybe the OP doesn't have an owners manual (it's an old car) and if you have only driven modern boxes the choke could be a new experience to them as Clive has pointed out.

FS

[Wim Fournier]

Well, I think you have 'false' air when the engine is still cold. Check if the nuts of the inlet and outlet duts to the head are really 'light'. Also the nuts that secure the  carb to the inlet manifold. When the engine is at operating temperature, the tightness of these connections is tighter than when cold.

When you have a carb, check if the axle that bears the throttle in the cadb's mouth sits tight in the carburettor body. At low rpm the air leak here is relatively much bigger than at cruising rpm.