[Healeys] #174 has a running problem

Peter Dzwig pdzwig at summaventures.com
Fri Jul 17 04:39:08 MDT 2015


I should have added that mine ran for almost exactly the same distance (36
miles) on a summer's day and then...

Peter

On 16/07/2015 19:32, Michael Salter wrote:
> 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 fuel  pump 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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-- 

===========================================================
Dr Peter Dzwig				



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