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Joe  Barfield
Joe Barfield, Master High-Tech
Category: Car
Satisfied Customers: 1354
Experience:  Transmission Tech - Management Master Winner 3rd place Entire US Southeast region #1 after masters
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1994 Mitsubishi Lancer: you accelerate..hesitates..kit..carb

Customer Question

Re: 1994 Mitsubishi Lancer carburetor engine.
Problem: When you accelerate hard in 1st 2nd and to a lesser amount 3rd the engine hesitates and judders with associated pinging.
My initial thoughts were the acceleration pump, so have put a pump kit through the whole carb. The problem is still there. The accelerator pump is working as you can see petrol entering the throat when accelerator activated. It almost seems the Suction Piston may be oscillating within its bore varying the fuel mixture. Should this have some type of dampening? Any suggestions?
Submitted: 7 years ago.
Category: Car
Expert:  Joe Barfield replied 7 years ago.
Hello, Have you tried closeing the choke at a idle to see if engine speeds up or tries to die ?....Thanks Joey
Customer: replied 7 years ago.

Hi Joe

There is no choke in this unit as it is fitted with a Cold Start Compensator.

After further investigation I believe all it needs is a good tune up to re-adjust the main power jet position relative to the suction piston needle.


Expert:  Joe Barfield replied 7 years ago.
Hi, So if you place your hand over the carb does the rpm increase ?
Customer: replied 7 years ago.


Just dies.


Expert:  Joe Barfield replied 7 years ago.
Well thats a good sign for sure vaccum leaks.......Sounds like your on the right path....
Customer: replied 7 years ago.
I resolved the issue myself
Expert:  Joe Barfield replied 7 years ago.
Take Care