Club126UK
Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: Lewey on December 16, 2005, 12:48:54 AM
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I have always had a bad flat spot on my Bis just after the second choke opens in the carb. As I am very near to driving the thing again (just need a a dizzy- please help someone) I would like to hear your opinions on what it is. My assumption is the accelerator pump/diaphram on the carb. When the engine was running a couple of month back I had taken apart and cleaned the carb with compressed air, checked fuel pump pressure, cleaned and gapped points and fited new plugs, timed the engine using a strobe without vacuum advance, then connected it to check ignition advance against data I have to make sure advance was accurate. I also mucked about with the idle mixture of the carb, deliberatly setting it wrong either way to try to force a change of habit with the flat spot. None of these things worked, however there was a noticable boost in performance overall of course as the engine was in poor tune when I bought the car. The car performs very well overall, easily going 70MPH on the flat (and round some roundabouts).
If it is the diaphram, where can i get one from?
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hi m8, yes i have same problem with the carb on my BIS!! you have to bring throttle backup to keep going!!! i drove it all summer like that!!
your right, i believe it is the pump diaphram! ive heard loads of people with the same prob.
Carb kits are cheap, www.ricambio.co.uk
they did two carbs for the BIS a weber and a polish one, make sure you state which one yours is, as when i got the weber carb kit one of the gaskets wasnt the right shape. I think the diaphram is the same though! i bought a weber version of the carb off ebay to stick on soon, i need ot get it cleaned up!
regards
Chris
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A flat spot on acceleration? That can't be normal... ya mean your BIS accelerates? Mine has no discernable acceleration :lol:
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I only just noticed this slanderous comment! Acceleration is my way of saying:
"As inertia builds, the car is forced along the road at ever greater speeds until it is going a little faster than it was a mile or so ago."
BTW: I have managed to iron out the problem with a slightly richer idle mixture. It may be back, but for now it is better.