| [ Total Views: 822 | Total Replies: 12 | Thread Id: 93107 ] |
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 karmannghia60
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| posted on October 10th, 2011 at 09:16 AM |
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Difficult cold start and running rough
Need help debugging the problem. The engine is an 1880 with a 34PICT carb, standard dizzy with electronic ignition
On most cold mornings, it is difficult to start. I can tell its firing on one or maybe two cylinders so hardly cranking. I have to floor the pedal to
keep it going then after a minute, the other cylinders start kicking in and the revs will pick up. It will take maybe 15 minutes by the time it is
running smoothly
I replaced the spark plugs already. Could it be a bad coil or bad HT leads?
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ratty 63
A.k.a.: Rossco
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| posted on October 10th, 2011 at 09:29 AM |
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Is this something that has just started happening or has it been going on for a while now?
R 
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karmannghia60
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| posted on October 10th, 2011 at 09:34 AM |
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Going on for a while
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chillihilli
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| posted on October 10th, 2011 at 10:24 AM |
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I have limited knowledge but - Have you checked your plugs again? In aviation an engine sometimes ran rough prior to take off. We used to run it up to
2000 rpm then lean out the carb - this causes the cylinder head to heat up and burn off crap on the plug. You are doing a similar thing by flooring it
and warming it up.The engine would then run smoothly. I would check if your plugs are fouled. If so it would point to a carb mixture and/or timing
issue.
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karmannghia60
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| posted on October 10th, 2011 at 11:34 AM |
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It could well be the issue because its running very rich. Mixture screw is jammed so I can't adjust it but I do have a near new 34PICT which I was
planning to use. Will do that first and see
Thanks
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karmannghia60
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| posted on October 10th, 2011 at 12:17 PM |
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By they way, is this was the problem, why would it happen only in the morning?
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stagvee40
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| posted on October 11th, 2011 at 06:28 PM |
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Hmmmmm sounds like your ignition timing is way to advanced. You do know that the marks on the crank pulley are 7.5deg and 10deg, neither is Top dead
centre.
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karmannghia60
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| posted on October 18th, 2011 at 01:47 PM |
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Thanks Mate, yes I am aware of what the marks represents
I replaced the one on the left with the one on the right (near new 34PICT) and its running much better now. However I am getting a small amount of
backfire at idle when the engine is still warming up. Running too lean?
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68AutoBug
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| posted on October 18th, 2011 at 02:43 PM |
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| Quote: | Originally
posted by karmannghia60
Thanks Mate, yes I am aware of what the marks represents
I replaced the one on the left with the one on the right (near new 34PICT) and its running much better now. However I am getting a small amount of
backfire at idle when the engine is still warming up. Running too lean?
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Hi
the carby on the Left has a piece missing o n the top shaft
the carby on The Right has it...
I don't think Your automatic choke was working...
turn the mixture screw in until the engine dies a bit [revs reduced] and unscrew about 1/2 a turn... see how it goes..
have You checked the choke flap?? choke adjustment?
when starting the engine...
You should push the accelerator to floor once..
then take Your foot off the pedal..
this operates the automatic choke....
then turn the key....
it should start and idle fairly high depending on the choke adjustment ...
what distributor are you using??
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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karmannghia60
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| posted on October 18th, 2011 at 03:16 PM |
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Thanks Lee
You are right about the missing part, I never noticed before!
i am running a standard vacuum advanced dizzy
The way I adjusted the mixture is different from what you described. I usually turn the screw till I get to the highest revs them turn it in 1/4 to
1/2 turn
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bajachris88
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| posted on October 18th, 2011 at 03:36 PM |
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what idle jet are you running for your bigger donk?
55 or 60 might not cut it for 1880cc. Mind you i get that kinda rubbish running on my 1600, but is a POS 34 pict 4 that is VERY well aged.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on October 18th, 2011 at 05:02 PM |
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| Quote: | Originally
posted by karmannghia60
Thanks Lee
You are right about the missing part, I never noticed before!
i am running a standard vacuum advanced dizzy
The way I adjusted the mixture is different from what you described. I usually turn the screw till I get to the highest revs them turn it in 1/4 to
1/2 turn
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OK
Yes
screw the screw in until You hear the slightest rev drop
[hesitation] and screw it out about 1/2 a turn...
engine must be hot to do this...
its probably running too rich...
cheers
LEE
PS: I always give it another 1/4 turn out to be sure...
a lean running beetle isn't good...
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Lucky Phil
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| posted on October 18th, 2011 at 05:16 PM |
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I would bet that the mainjet would want to be bigger if you are running a larger 1880 engine too.
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