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cbig1969

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My 1972 3-speed manual Plymouth 340 Duster has the following issues,

1 - Why do all my lights shut completely off when I hit the high beams?

2 - Why does my car fire right up from a cold start but take forever to start when it's warm.
 
Long crank on hot start is usually a fuel boiling or leaking issue. Make sure you have the thick insulator gasket under the carb. If your passenger exhaust manifold still has the EFE valve in it make sure it is not stuck closed or partially so causing excess intake manifold heat from the crossover. If it is a Holley carb it could be a leaking power valve. A more detailed description of the engine and fuel system would help.
 
mguner said:
Long crank on hot start is usually a fuel boiling or leaking issue. Make sure you have the thick insulator gasket under the carb. If your passenger exhaust manifold still has the EFE valve in it make sure it is not stuck closed or partially so causing excess intake manifold heat from the crossover. If it is a Holley carb it could be a leaking power valve. A more detailed description of the engine and fuel system would help.
Click to expand...
It is a 1972 340 4-barrel, 3-speed manual, original engine and trans
 
cbig1969 said:
It is a 1972 340 4-barrel, 3-speed manual, original engine and trans
Click to expand...


If you have electronic ign, check the reluctor gap in the distributor and get it to .007"/.008" with a non-metallic brass feeler gauge.

I had a new one that was .030" and it would start cold, not hot. After adjusting the reluctor gap, never had a starting issue again....
 
cbig1969 said:
My 1972 3-speed manual Plymouth 340 Duster has the following issues,

1 - Why do all my lights shut completely off when I hit the high beams?
Click to expand...

I would try changing the foot dimmer switch first, they are not that expensive and if that doesn't fix it, then you need to look at the wiring.
 
cbig1969 said:
It is a 1972 340 4-barrel, 3-speed manual, original engine and trans
Click to expand...

Yeah I read that part. I have so many Mopars I can't remember what the build sheet says they came with and most aren't "original" in that regard anyway so.... Thermoquad, AVS, Holley?
 
krazykuda said:
If you have electronic ign, check the reluctor gap in the distributor and get it to .007"/.008" with a non-metallic brass feeler gauge.

I had a new one that was .030" and it would start cold, not hot. After adjusting the reluctor gap, never had a starting issue again....
Click to expand...

I'll try this first
 
So if it is a Thermoquad the well seals may be leaking down and you have a flooded condition. Does is smell of gas when the starting issue occurs or puff black smoke?
 
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