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68autobug

VW Guru
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Posts: 2,108
Reply with quote  #1 
My 1600 single port engine is missing and having small backfires in the muffler..  Car just goes Ok at about 1500rpm
that doesn't mean going normally... but can go at that speed without too much backfiring and missing...
Spark seems to be OK.. it starts and idles not too bad.
I am using an electric fuel pump with pressure at .02 kg/cm2
which I'm not sure how much pressure that is..
so flooding??? or  fuel starvation??
I'm thinking too much fuel or air leakage
probably too much?
I'm going to take the carby off and check it...

Lee in Australia




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- helping keep air cooled Volkswagens alive in Australia and around the world --
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68autobug

VW Guru
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Posts: 2,108
Reply with quote  #2 
Well,
I have taken the carburetor off and it looks fine... also took the inlet manifold off and replaced the gaskets etc.
I went to time the engine with a strobe timing light on number one cylinder as usual, but the light didn't flash as it should?  only now & then and when it did flash the engine went OK,
otherwise it was missing firing on No 1 cylinder. I pulled the spark plug out and cleaned it and also
did fit another coil.,and put the plug back in and tested all the leads and coil.. everything was OK.. wiped the inside of the distributor cap with CRC cleaner.
engine still starts first go, but at idle is missing badly on number 1 cylinder but is OK when I moved the distributor so the engine revs a bit more.. also it now revs fine but not at idle..

I then found by tightening the distributor clamp, the engine fires great, no missing ???  so what has caused the problem??
why has the clamp made so much difference ??
the dizzy is an SVDA from aircooled.net and about 3 years old and done less than 15,000 klms..

LEE in Australia




I  \

I che

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- helping keep air cooled Volkswagens alive in Australia and around the world --
I have been on here since 20th February 2004
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68autobug

VW Guru
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Posts: 2,108
Reply with quote  #3 
You aren't going to believe this

it was the spark plug for number one cylinder.. only 2 months old..
only done about 3,000klms..

I took the pertronix out of My SVDA dissy and put new cap,new rotor, new points and condensor plus a used bosch spark plug...

Now I've put the pertronix back in the Dissy, its idling Ok and drives OK but I don't know if it will go over 80 KMH..??

when I tried to tune the distributor all the advance i was getting was about 20 degrees BTDC..  maximum... instead of the 40 degrees I got before..

I must have done something to the distributor..??

Maybe the pertronix magnetic piece is touching the sensor..
I did put them close as I could... maybe they are touching??
or a screw is too long??  I seem to drop those extra short screws...
and replace them with longer ones??

:LEE




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- helping keep air cooled Volkswagens alive in Australia and around the world --
I have been on here since 20th February 2004
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bob

VW Enthusiast
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Posts: 38
Reply with quote  #4 
Hi Lee

I had the same problem, found out the distributor was the problem, Inside the distributor there are springs that hold weights that control the advance, if one spring loosens, rusts or breaks it affects how the engine runs. I put in a new 009 distributor and never looked back.
I also had a problem with my 1600 dual port with back fires, at the time I was using a 34 pic 3 carb and went to a 31 pic 3 for better fuel economy instead.
One of the re occuring problems I have now is sometimes the engine does not start right away, only to look down the throat of the carb to see fuel leaking down when I shut it off. This problem is due to the pot metal around the check valve where the fuel comes in to the carb, I usually have to put teflon tape on the threads of the check valve and the gasket. The pot metal of the carb expands with heat and age. 

Bob 
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