Engine Revs Drop When Stopping

[Guest paul091085]

I have a problem with my 2b that occurs when i drive hard then come to a quick halt, ie coming off a motorway onto the sliproad. The engine revs drop rapidly and the car cuts out unless you quickly blip the throttle and catch it. It is rare that i can come to a stop and have the idle settle at 1000rpm which is where i have it set at the moment. If it doesn't cut out, its normally settles at around 750-800 rpm. Does anyone know what might possibly be causing this?

[Guest Stuartl]

Possible leak on inlet manifold. Spray a bit of WD40 all around it with the engine running and see if the engine note changes

[Guest woolly]

one off many could be the carb float levels needle valve not sealing 100% or dirt in the carb. giving a high fuel level under the G of braking

 

woolly

[Joel]

I used to get this all the time with mine - I just put it down to one of those kit car quirks, and learned to live with it, but I'd be interested to hear a solution

[Jamiep]

I had similar problem on mine, would not idle well or cut out whilst slowing down.

Friend of mine spotted this:

There had been a rubber cap there last time we looked and it was sucking air in making the engine run lean, blocked it off again and the car now idles fine and nolonger cuts out.

[Guest musker 04]

hi mate you need to have a good look at the carb and manifold are you ok on this stuff as am only down the road from you and would gladley have a look at it

[Guest paul091085]

Thanks to everyone for the replies and suggestions. Thanks 'Musker 04' for the offer to come have a look, however i have finished uni and am now back living in St Albans(must chabe my details). I ran out of time at the weekend to look at anything so will have a better look this Saturday.

 

Paul

[Guest salty_monk]

Lean running or maybe a blocked filter or dodgy plumbing to the carb so the float bowls are being starved of petrol....

 

I *think* if you have a slow filling carb bowl that would affect it more at idle & low throttle than WOT.

 

Someone better on carbs than me will probably confirm.

 

Dan

[Guest mtechautomotive]

Lean running or maybe a blocked filter or dodgy plumbing to the carb so the float bowls are being starved of petrol....

 

I *think* if you have a slow filling carb bowl that would affect it more at idle & low throttle than WOT.

 

Someone better on carbs than me will probably confirm.

 

Dan

 

 

If it were injection I would say fuel starvation (ie lack of a swirl pot or something) so again yes would say maybe too low a pressure on the pump/flow rate to keep the bowl full? (Carb novice here!!)

 

Matt

[tendoshingan]

Like everyone else said sounds lean, mine was doing this too, quick squirt with wd40 pointed out the problem,

also sounded like I had tweetypie under the bonnet!

[Bob Tucker]

Check the brake servo pipe for leaks & also the 1 way valve