Author Topic: Petering out / Stalling at junctions  (Read 231 times)

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Steam

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Petering out / Stalling at junctions
« on: October 23, 2020, 11:39:08 AM »
This is an intermittent, annoyingly persistant fault that seems to come and go.
Approaching junctions or when coming to a stop the engine will peter out and stall. It then takes a couple of cranks to start and seems to have low idle rpm before recovering. If revved after starting it seems to miss somewhat before coming good.
The engine runs well and pulls well in all other respects.
Anyone got any ideas, it is doing my head in.
Cheers, Dave

Halfpint

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Re: Petering out / Stalling at junctions
« Reply #1 on: October 23, 2020, 11:44:52 AM »
Sounds like fuel/carbie related.
Dash pot oil too heavy?
Vac leak around a gasket?
Vac or mech advance sticky.

Do you have a spare carby you could try ( So you dont mess around with the current carbie set up).
HP
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Steam

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Re: Petering out / Stalling at junctions
« Reply #2 on: October 23, 2020, 05:12:33 PM »
Thanks Tony,
I did a vac leak test over the whole manifold, adv etc but found nothing.
Would advance problems also show while trying to test in shed etc because I cannot get it to fault ither than when driving.
I HATE IMTERMITTENT FAULTS. >:(
Just had to put that out there 8)
Cheers, Dave

Halfpint

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Re: Petering out / Stalling at junctions
« Reply #3 on: October 24, 2020, 11:32:51 PM »

I HATE IMTERMITTENT FAULTS. >:(


Im sure we are all hearing that  ;)

Ok, so what else could do it? ie: show these/this particular symptom?

HP
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Drakman

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Re: Petering out / Stalling at junctions
« Reply #4 on: October 25, 2020, 07:45:18 AM »
Hi Steam,

Is the dash pot sticking or perhaps the throttle shaft a bit tight, when it gets hot it allows the throttle to go fully home?

I concur, I hate intermittent problems.

Dave

Steam

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Re: Petering out / Stalling at junctions
« Reply #5 on: October 25, 2020, 08:08:48 AM »
Thanks all for suggestions.
I now believe it to be carb icing having thought about what actually is happening both before and when it stalls.
I am yet to prove it but have made some mods to try to prevent it, ie temporary pipe from the air spout pointed near the ex manifold.
Cheers, Dave

Steam

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Re: Petering out / Stalling at junctions
« Reply #6 on: October 25, 2020, 12:44:30 PM »


This was the mod I made for hot air
Don t know why I bothered.
Did not fix problem andd made it run like a bag of nails.
To quote the worlds fastest Indian, whose bloody stupid idea was that anyway?? :o

So not carb icing but we did manage to make it do it a few times. Revs drop low to cut out and when it starts after a couple of cranks have to rev it to get the idle back to normal.




Cheers, Dave

Pete Power

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Re: Petering out / Stalling at junctions
« Reply #7 on: October 29, 2020, 04:47:21 PM »
check the fuel bowl is not loose
Happy Mokin
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Pete

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Steam

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Re: Petering out / Stalling at junctions
« Reply #8 on: October 29, 2020, 05:17:13 PM »
check the fuel bowl is not loose

Thanks Pete I will check
Do you mean loose as in tthe bolt that holds it to the carbie?

I checked the vac advamce and it is working correctly.
Cheers, Dave

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Re: Petering out / Stalling at junctions
« Reply #9 on: October 31, 2020, 11:51:40 AM »
Hope you are getting to the bottom of this.


Does behaviour go away if you are in neutral? Just thinking low idle and over zealous clutch can put a bit of pressure on thrusts - taking engine just below idle rpms?   Cheers Darryl

Steam

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Re: Petering out / Stalling at junctions
« Reply #10 on: October 31, 2020, 04:48:50 PM »
Hope you are getting to the bottom of this.


Does behaviour go away if you are in neutral? Just thinking low idle and over zealous clutch can put a bit of pressure on thrusts - taking engine just below idle rpms?   Cheers Darryl

Spot on Darryl, I think.
I have just come in from the shed, and the clutch is indeed dropping the revs, seems somewhat erratic though. Sometimes it will drop 250 rpm others 100 rpm and but most times not at all.
While the idle rpm is not particularly low we have noted over the last 2 weeks or so that the condition is more likely to show while the engine is still warming up.
Adding to the condition is the fast idle was inoperative due to the screw being backed right off so with what I thought was choke 3/4 in so off the mixture enrich but still on the fast idle was not the case.
Will not get chance to test until next weekemd though but we are pretty sure it will be greatly improved if not fixed totally.
Thanks to all.
Cheers Dave.
Cheers, Dave

Pete Power

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Re: Petering out / Stalling at junctions
« Reply #11 on: November 02, 2020, 04:52:08 PM »
Yes the bolt that hold the bowl to the carby.
Happy Mokin
Regards
Pete

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"Just because you're breathing doesn't mean you're alive!"