[T3] Cold idle Problem

SCS Crewcab scscrewcab at bellsouth.net
Wed Jul 20 20:55:57 PDT 2011


OK, but, if it's caused by either of these problems, wouldn't it also 
run lousy when I revved it up? Is there anything on the Type 3 FI system 
that performs the same function of the choke on a carbed car?


On 7/20/2011 11:16 PM, Jim Adney wrote:
> On 20 Jul 2011 at 22:06, SCS Crewcab wrote:
>
>> I got my '71 FI Fastback running. I plugged the holes in the gas tank
>> with epoxy paste and squirted carb cleaner in the ports of the fuel pump
>> and kept reversing polarity until it freed up. It's running pretty good
>> for being parked for 3 years. Kind of amazed it cranked at all. Anyway,
>> I've had a nagging problem ever since I got this car. When I start it
>> when the engine's cold and let it idle, it either shuts off or idles
>> like it's about to shut off. If I rev it up a few times or just hold the
>> pedal down about a quarter of the way, after about 15-20 seconds, it
>> will idle normally. I've tried all the obvious things like timing,
>> plugs, plug wires, idle setting, etc. It's no big deal, I'm just
>> wondering what's causing it.
> Two possibilities come to mind.
>
> The first is that the fuel ring gets air in it after being parked
> hot, and you're just waiting until all the bubbles are gone. The test
> for that is to park it when hot, restart it a few hours later and let
> it run for just the few seconds it takes to settle down, then leave
> it alone until the next morning. If it starts and runs nicely the
> next morning, the fix is to install a switch that will let you run
> the pump for a few seconds before starting, to fill the fuel ring.
> All my cars have this switch. I sell a kit to fix this for $10-11,
> depending on whether it's AT or MT.
>
> The second is that it's running rich on startup and that floods a
> cylinder. The engine won't run smoothly until that cylinder is
> flushed out and starts firing again. I've had cars which did this and
> I just got around it by driving it up the street then taking my foot
> off the gas and letting the road wheels turn the engine for a few
> revolutions. This empties the cylinders and gives each of them a
> fresh start. If that's the problem, the engine will run smoothly
> after you do a little of this engine braking.
>
> You can try both tests and decide which problem you have. You may
> also have both.
>



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