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Having just returned from a fabulous trip over to Applecross and Torridon in my Roadster with wall to wall sunshine and plenty of heat (like having a hairdryer blowing at us the whole time!) I encountered a problem which I need some advice about…
I have the Fiat twin-cam 2.0 with the single original Weber 34 ADF250
Driving up the Bealach na Ba which I think is the highest public road in the UK at 2,100’+ in 23*C the car performed flawlessly but I was watching the water temperature going up and up. It almost reached 100*C. We parked up at the top and opened the bonnet side to let the cool breeze help cool it down – all the while the fan was whirring away too. After stretching our legs we came back, closed the bonnet and then drove down the hill. The water temperature was now down to a respectable 75/80 however the engine was clearly unhappy and almost felt as though it was starving for a richer fuel mixture as it would cut out when idling – which meant passing places were awkward as I’d constantly stall and have to restart again. It wouldn’t idle happily and would struggle to keep alive but usually it’d just cut out.
I figured the Carb might need a mixture screw tweak – but it is in such an awkward position right near the engine bay louvre side that I couldn’t possibly get a screwdriver into the channel to reach the screw deeper within. So the only option was to adjust the throttle lever stop screw until it would remain running, higher tick over (1000) but running at least. Nonetheless, even when running along at 10-30mph it just doesn’t feel happy and is pretty rough. Above 30 it was fine.
We got back home and she’s parked in the garage awaiting surgery… I’d be surprised if it really needs a mixture tweak because prior to the hot hill ascent, it has been perfect – starts every time, runs smooth and no rough idling at all.
So, knowing virtually nothing about Carb dismantling & repair I’m hesitant to start an overhaul – but the spondulicks are in short supply and this hot sunny summer weather won’t last forever.. So I turn my request for your advice… What would you suspect is the trouble and do you have a link to a web page showing step by step details / pictures of its repair.. – I’m better when I can watch / see another doing it than just attempting blindly on my own…!
I have the Fiat twin-cam 2.0 with the single original Weber 34 ADF250
Driving up the Bealach na Ba which I think is the highest public road in the UK at 2,100’+ in 23*C the car performed flawlessly but I was watching the water temperature going up and up. It almost reached 100*C. We parked up at the top and opened the bonnet side to let the cool breeze help cool it down – all the while the fan was whirring away too. After stretching our legs we came back, closed the bonnet and then drove down the hill. The water temperature was now down to a respectable 75/80 however the engine was clearly unhappy and almost felt as though it was starving for a richer fuel mixture as it would cut out when idling – which meant passing places were awkward as I’d constantly stall and have to restart again. It wouldn’t idle happily and would struggle to keep alive but usually it’d just cut out.
I figured the Carb might need a mixture screw tweak – but it is in such an awkward position right near the engine bay louvre side that I couldn’t possibly get a screwdriver into the channel to reach the screw deeper within. So the only option was to adjust the throttle lever stop screw until it would remain running, higher tick over (1000) but running at least. Nonetheless, even when running along at 10-30mph it just doesn’t feel happy and is pretty rough. Above 30 it was fine.
We got back home and she’s parked in the garage awaiting surgery… I’d be surprised if it really needs a mixture tweak because prior to the hot hill ascent, it has been perfect – starts every time, runs smooth and no rough idling at all.
So, knowing virtually nothing about Carb dismantling & repair I’m hesitant to start an overhaul – but the spondulicks are in short supply and this hot sunny summer weather won’t last forever.. So I turn my request for your advice… What would you suspect is the trouble and do you have a link to a web page showing step by step details / pictures of its repair.. – I’m better when I can watch / see another doing it than just attempting blindly on my own…!
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