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Hot starting problem

Having trouble with my 76 LX Torana not starting when its hot. It doesn run hot, just won't start at operating temp. I've heard suggestions like vaporised fuel in the carby, problems with the condenser in the distributor and maby a crack in the head leading to a loss of compression. Has anyone had a problem like this?

Also, What is the general consensus about lead replacement petrol? Are there any fuel additives worth using?

Thanks,

Philip.
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is it hard to start or wont start at all?

i had a similar problem that turned out to be a leaky float valve in the carby which leaked fuel into the engine after it was shut off and flooded it. it was usually ok if shut off for long enough otherwise it would be really hard to start.

hope this is helpful.

neil

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i have the same prob with my lx, i think what happens is the fuel evaporates due to the heat in the engine bay and because the fuel line runs along the rocker cover. i find that if you put your foot on the accelorator it kicks over first go.

you done anything to your lx? im thinkin of modifying mine a bit, need some ideas

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I havn done anything to mine, its a stock 173 at the moment. I have a set of headers to fit, but cant afford the insurance (under 25 yrs). I'm thinking of getting hold of a slightly worked 202 sometime.'

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I had a similar Prob. with a HZ sedan I had and I fixed it by refitting the heat shield that someone had previously removed from under the Carby. Hope this is of some assist.

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the heat shield is for cold starts, it helps get the engine up to operating temp quicker. the valve on mine used to stick and hot air was fed in even when the engine was up to temp. probly better off getting rid of it. or well maybe not if it helped tribey.

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Thanks for the help, Ill check those out.'

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Yep sounds like needle and seat fuel leaking back through fuel pump.

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I have the same problem but running LPG. It starts and runs fine when its started cold but runs really rough when started hot, need the choke on full or else it stalls. I've tried staring it with the LPG switched off for 5 seconds then switching it on to rule out flooding. Really hard to get out of carparks and not good for the transmission. Could it be a mixture problem?
Seems to fix itself if i put it in neutral after i've been driving for a while, let it stall, then start it again.
I've changed all the electrical components.
I cant run it on petrol.
Please help

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I've never owned an LPG car but have known a few that have & what i was told at TAFE engineering was that you should start your car with petrol & run it for a couple of mins before changing to lpg. Also before turning your motor off you should change to petrol. When hot your motor heats the carb (heatsink) & because lpg is vapour it basically runs the carb dry. So being hot & dry makes it hard to start until enough lpg makes it past a very hot carb to the motor. By using petrol before shutoff cools the carb & helps with heatsink probs, also gives the car immediate fuel in the floatbowl to start up with.
You say you can't run petrol in your car, well to my understanding & this explanation, you need petrol to remedy your problem.
'63'64 bloody good years for 2 doors

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Thanks, that sounds like a good explanation, i want it to run on petrol anyway so i will fix the carbie and give it a go.

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