Just won't stay running.

sandawg · Posted: Tue Dec 12, 2017 5:13 pm Post subject: Re: Just won't stay running.

OK, Here is my final opinion on this issue. I am convinced that the carb is the issue. It did the same thing with the old later model smog sensitive carburetor that was on the motor.
There is absolutely nothing left that isn't according to specs for the motor. If carb is on the fast idle cam it runs fine and accelerates just fine and it will idle. If it comes off the cam it stalls. If I put a feeler gauge under the throttle pedal it runs. The idle is not affected by the adjustment on the idle screw in the side of the 34 pict-3. If anybody has another solution then "git er done". I'm ready to take it to a vw mechanic now as my 57+ years of being a back yard mechanic have met it's end as far as figuring this one out. Mad

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LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

satterley_sr · Posted: Tue Dec 12, 2017 5:36 pm Post subject: Re: Just won't stay running.

Unscrew the idle jet about 1/8 to 1/4 turn. You might have to re-adjust your idle mixture. The purists will give me grief but it works
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DDC racing

sandawg · Posted: Tue Dec 12, 2017 5:59 pm Post subject: Re: Just won't stay running.

I will try it! Funny, I just changed out the main and idle jets today. Thank You. I'm also going to do a complete intake leak scenario......again.
_________________
LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

sandawg · Posted: Tue Dec 12, 2017 6:18 pm Post subject: Re: Just won't stay running.

The purest should take another look at your recommendation. I just tried what you said and it idles just fine now. After all I've gone thorough the last few weeks I would endure a week in the worst mosquito time of the year in Mi., in the nude to show you my appreciation for this. Now I will warm it up and attempt to adjust the idle properly tomorrow.
Thanks for the help again! Very Happy

_________________
LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

joemama · Posted: Tue Dec 12, 2017 7:14 pm Post subject: Re: Just won't stay running.

What does loosening the jet do?

modok · Posted: Tue Dec 12, 2017 7:29 pm Post subject: Re: Just won't stay running.

Makes it act like BIG jet.
For whatever reason, the thing's just plain LEAN, Can't get enough fuel to idle. You unscrew the jet and it's like going from a size 50 jet to a 100 or so

usually, the source of the problem is a hidden carburetor passage is plugged, or there is a vac leak. Most vac leaks are easy to find but a bent valve or a hole in the head or manifold can be hard to find, and still counts as a vac leak. Power balance test might be clue, if it is even on all four or not.

boxkiteflyer · Posted: Tue Dec 12, 2017 8:04 pm Post subject: Re: Just won't stay running.

Make sure there isn't crap in the fuel line or somewhere as Modok suggested. A 'bolus' of crap gets pulled toward carb (along with some fuel) then obstructs wherever. Engine quits so pump quits pumping, crap backs away and floats upstream toward tank. Rinse and repeat. It was a problem for me... once.

satterley_sr · Posted: Tue Dec 12, 2017 8:54 pm Post subject: Re: Just won't stay running.

I know it is covering up some hidden blockage or wear by unseating the idle jet but they don't seem to run overly rich. Carb cleaner and even ultrasonic does not seem to clear it. If you are lucky, after running for awhile the flow of fuel will clear the blockage and you can re-set the idle jet back in.
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DDC racing

sandawg · Posted: Tue Dec 12, 2017 9:24 pm Post subject: Re: Just won't stay running.

One puzzling thing I found yesterday was the vacuum at the carb. read 30. Never saw that hi of a vacuum reading before. FYI 2 and 4 read 120 compression and 1 and 3 read 95-100. A clue here?
_________________
LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

modok · Posted: Wed Dec 13, 2017 2:04 am Post subject: Re: Just won't stay running.

trace the circuits, and see if they all connect and go where they are supposed to go.. See where the air goes? See where th fuel goes?
Chinese carburetor, is that trustworthy? IMO heck no

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sandawg · Posted: Wed Dec 13, 2017 2:14 pm Post subject: Re: Just won't stay running.

In case all else fails how big a motor can I go with the existing Carb. 34 pict-3 with a dual port manifold?
Might want to just buy new motor rather than screwing with this one.
_________________
LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

FreeBug · Posted: Wed Dec 13, 2017 2:38 pm Post subject: Re: Just won't stay running.

Are you going to put the SAME carb on a different engine and expect different results?

sandawg · Posted: Wed Dec 13, 2017 2:56 pm Post subject: Re: Just won't stay running.

I 'm just curious in case it turns out to be a problem with the motor and not the carb as pointed out by another post.
_________________
LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

sandawg · Posted: Thu Dec 14, 2017 7:37 pm Post subject: Re: Just won't stay running.

No input on vacuum reading?
_________________
LIFE'S JOURNEY TO THE GRAVE SHOULDN'T BE WITH THE INTENTION OF ARRIVING
IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE,
THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY SHOUTING,
HOLY SH*T.....WHAT A RIDE !

nsracing · Posted: Fri Dec 15, 2017 9:36 pm Post subject: Re: Just won't stay running.

Onceler · Posted: Fri Dec 15, 2017 9:48 pm Post subject: Re: Just won't stay running.

Compression check? I always start there with an unknown engine
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1972 Karmann Ghia

sandawg · Posted: Sat Dec 16, 2017 11:15 am Post subject: Re: Just won't stay running.

sandawg · Posted: Sat Dec 16, 2017 11:29 am Post subject: Re: Just won't stay running.

hobbybob517 · Posted: Sat Dec 16, 2017 11:32 am Post subject: Re: Just won't stay running.

Did you test the compression with the engine warmed up?
full throttle?

Also instead of changing the engine, you could simply change the carb.
hope you get this thing figured out soon , i know what it feels like to have unfinished tuning buisness going thru the mind Razz

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Bob Brugge · Posted: Sat Dec 16, 2017 12:12 pm Post subject: Re: Just won't stay running.

I'm surprised no one has asked this. Did you clean the new carb before you installed it? A plugged carb is going to still act like a plugged carb whether it is new or old. They are not plug 'n' play.
comp should be with in 10% hi to low? so 120-12=102. 95 is a little weak, probably runnable for a while still.
The way I think of timing is this. It takes X amount of time for the current to go from the dist cap to the plug gap. That time can be measured in crankshaft degrees of rotation. you want the points to fire Before tdc so the piston is in the right spot when the spark gets there.
Happy tuning.
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Keep on Dubbin'!


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