Stuttering / Cutting out, petrol starvation

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Stuttering / Cutting out, petrol starvation

Post by scimjim » Wed May 16, 2018 9:56 pm

there must be some club members oop north that could have a look?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Stuttering / Cutting out, petrol starvation

Post by Pommy » Fri May 18, 2018 10:00 pm

After 4 months of trying to fix this cutting out problem its time to hand over to the 'professionals', or at least someone who knows what their doing. Does anyone know of a reputable classic friendly garage in or very close to Preston Lancashire, I only have 15 to 20 mins drive time before it cuts out.. Hopefully there is. Pommy


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Stuttering / Cutting out, petrol starvation

Post by Pommy » Sat May 26, 2018 9:54 pm

One last help request before I hand it over to 'A' garage. After the last test run (static), when the engine cut out I managed to take the top of the carb off, as it came off there was a woosh of pressure from the float chamber, can't be sure if the air rushed in or out... The float chamber was about a quarter full of petrol. Is this significant. Pommy


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Stuttering / Cutting out, petrol starvation

Post by rebel alliance » Sat May 26, 2018 11:44 pm

Try changing the rotor arm for a new one..recent post on here suggests they can fail when hot...edit i can't find that post but have a look at the "Distributor Doctor" and why rotors fail..



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Stuttering / Cutting out, petrol starvation

Post by Johniewalshe » Fri Jun 08, 2018 10:42 am

Any update on the issue. I am chasing the same problem on a se6 auto.



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Stuttering / Cutting out, petrol starvation

Post by Pommy » Fri Jun 08, 2018 10:06 pm

John, the car is waiting to go to my local garage, I've run out of ideas, the float chamber seems to be pressurising forcing the needle to cut off fuel, how I don't know. Then again I might be barking up the wrong tree. Fuel is pressure regulated at 3psi. Car performs brilliantly for 20 mins then won't rev and just dies, cools down a little then away again, but only for a bit, makes it hard to get home. Pommy


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Stuttering / Cutting out, petrol starvation

Post by Johniewalshe » Fri Jun 08, 2018 10:44 pm

One of those problems that wreck your head. I need to start checking timing, fuel pressure etc. Mine is fine when driving but plays up if left idling for 10 mins. Once I select drive it dies.
Ill let you know if I find the issue.



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Stuttering / Cutting out, petrol starvation

Post by Johniewalshe » Sat Jun 09, 2018 9:54 pm

Hi,
got mine sorted.
I better pressure after my filter king, I had 2 psi so adjusted to supply 3 psi. Little effect

I also had a misfire when hot. I replaced ballast, coil and points. I used a accuspark blue sports coil. I swaped back to original coil and it runs perfect.
(I am going to open a post to ask for opinions)
Last edited by Johniewalshe on Sat Jun 09, 2018 10:48 pm, edited 1 time in total.



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Stuttering / Cutting out, petrol starvation

Post by Pommy » Sat Jun 09, 2018 10:04 pm

John, glad your sorted, I have done all you have and then some (not a ballast system), will let you know how things go. Pommy


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Stuttering / Cutting out, petrol starvation

Post by scimjim » Sat Jun 09, 2018 10:34 pm

Have you modified it to remove the ballast (eureka wire)?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Stuttering / Cutting out, petrol starvation

Post by Pommy » Sun Jun 10, 2018 9:50 pm

No Jim, never was a ballast system. Pommy


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Stuttering / Cutting out, petrol starvation

Post by scimjim » Sun Jun 10, 2018 10:00 pm

5a is a ballasted system as standard?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Stuttering / Cutting out, petrol starvation

Post by Dennis Nicholas » Mon Jun 11, 2018 10:37 am

Pommy wrote:
Sun Jun 10, 2018 9:50 pm
No Jim, never was a ballast system. Pommy
Pommy. Just to clarify in case you don't know (and for benefit of those new to the black art of "'lectrics"): the 12 volts from the ignition switch goes into the wiring loom in a normal wire and near the other end is joined to a wire which has a higher "resistance" to electricity flow.....that higher resistance bit of wire is called the "eureka" wire and it goes onto the coil. When electricity flows in the ignition circuit to the coil the effect is that the 12V at the beginning becomes about 9 volts at the end of the eureka wire connected to the coil.(i.e. there is a voltage drop across the eureka resistance wire in this cas about 3 volts).....it is thus that the 5 does not have that resistance-wire wound round a white ceramic former which is known as a "ballast" resistor. The 5 thus is a ballasted system but with a hidden eureka wire resistance as opposed to a visible ballast resistor.
Further for newcomers......9volts is thus supplied to the coil for normal running but when the starter is operated the 9 volt supply is opened and instead 12 volts is supplied to the coil via the starter motor switch so that the coil is guaranteed a good operating voltage even though the starter motor is causing the battery output voltage to be lower because of the high flow of electricity the motor is using.

Dennis


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Stuttering / Cutting out, petrol starvation

Post by Pommy » Mon Jun 11, 2018 10:10 pm

Thanks for that, really don't understand any of it. Been using the car for 5 years without any major issues, my current problem started Nov last, not modified any of the electrics, I need it explained how a ballast issue could cause my lack of go but only after 20 mins running, and what I would need to do, ie were is the eureka wire. Pommy


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Stuttering / Cutting out, petrol starvation

Post by scimjim » Mon Jun 11, 2018 11:16 pm

I think the lack of fuel in the carb is almost certainly the root symptom - but a eureka wire breaking down as it heats up could give similar symptoms?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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