[Healeys] #174 has a running problem

[Oudesluys]

Blocked fuel tank ventilation?
Kees Oudesluijs


Michael Salter schreef op 16-7-2015 om 20:32:
> I have done the following;
>
> STEPS TAKEN TO FIND RUNNING PROBLEM
>
> This car has an original cap, original wires, original NA8 spark 
> plugs, original black coil, original fuel pump. I am determined not to 
> change any of these original parts unless I can confirm definitely 
> that that item is the source of the problems…it a concours issue!!
>
> After many short trips 10 – 15 miles etc... the engine started to run 
> very badly after 35 odd miles of a longer test drive on a warm but not 
> hot day after travelling over a few hundred meters of rough road under 
> construction eventually stopping completely as I tried to climb a 
> hill. Sounded to be running on 2 cylinders at times. Backfiring 
> through exhaust… no throttle response.
>
> Cranked but would not start..Appeared to have spark at the coil wire..
>
> Affer cooling started out again…after 20 odd miles stopped with the 
> same symptoms… pulling choke seemed to make no difference.
>
> Could not hear fuelpump ticking but had fuel pressure at the front 
> carb……good spark at coil wire…spark at plugs looked thin …Changed the 
> condenser and the rotor and it started reluctantly and ran well for 
> about 15 miles then stopped again….same symptoms….changed rotor…ran 
> for 2 miles same symptoms…
>
> Found “3 cut” washers under the carb float chamber struts which I 
> think could be sealing off the vent slots for the float chambers…
>
> Next day, today, I headed out for another extended drive and the car 
> ran perfectly on a similar day for 36 miles then repeated the problem 
> after 36 miles and I just managed to nurse it home another 11 
> miles….it actually died as I approached our driveway and I coasted in 
> with the ignition turned off.Nothing would make it start.
>
> Tested the coil 4.6 ohms with no short to ground. Took off the float 
> chamber lids and both were full to the correct level. The engine 
> cranked but would just not start..
>
> After checking everything I could think of I believe that I have found 
> the problem but I don’t have time to do another 36 mile test before 
> loading the car to take to Enclave…
>
> What do you think I found?
>
>
> Michael..
>
> -- 
> /If you can't fix it with a hammer, you've got an electrical problem./
>
>
>
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