Acceleration 'hole'

[Jeand'aubry]

I'm not so fluent in english but I will try to do my best.

I appologize in advance .

Can someone help me?
I own a 1989 Lotus Esprit Turbo in excellent condition.
I encounter a small problem but very annoying.
When accelerating in first, sometimes in second gear but never in other gears,

there is a small 'hole' during acceleration, less than a second, and then it starts again very well.
The carburettors have been overhauled and well balanced, the ignition and spark plugs are new, the pump is working properly.
Does anyone have an idea?

 

Thanks for your help.

Jean

[jonwat]

3 hours ago, Jeand'aubry said:

When accelerating in first, sometimes in second gear but never in other gears,

there is a small 'hole' during acceleration, less than a second, and then it starts again very well.
The carburettors have been overhauled and well balanced, the ignition and spark plugs are new, the pump is working properly.
Does anyone have an idea?

It does sound like a carb problem, maybe the float heights are not correctly set or possibly the accelerator pumps are not delivering the correct amount of fuel when the pedal is pressed.

The procedures for checking the float heights & how to check & adjust the accelerator pumps is detailed in the manual.  when  you say the pump is working correctly do you mean the fuel pump or the accelerator pumps? 😀

[Jeand'aubry]

John,

We measured the fuel pressure after the regulator. it is correct.
Good idea, the height of the floats.

It seems to me that it was correct during reassembly.

I'll check.

How to check the accelerator pumps?

Cheers

[MikeJ]

Some cars have a flat spot around 2300 revs I increased idle jet size from 40 to 42 to sort it

[Jeand'aubry]

Thanks, if the proposal to check the floats level is not working, I will try your solution.

 

Best regards

[jonwat]

12 hours ago, Jeand'aubry said:

How to check the accelerator pumps?

You have to squirt them into a container & measure the amount. it's in the manual. 

[Lotus5509]

An '89 turbo with carbs ? Only in Europe I guess ? 

[Jeand'aubry]

No, I know some Esprit turbo with carbs.

Thanks to Jonwat, the problem is fixed.

[jonwat]

58 minutes ago, Jeand'aubry said:

Thanks to Jonwat, the problem is fixed.

Good news. what was the problem, floats or accelerator pumps? 

[Jeand'aubry]

Wrong adjustement on float on one carb, basic, each time we must go to basic.

Thanks again