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VVWC :: View topic - 1974 AH 1600cc engine just not running right
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1974 AH 1600cc engine just not running right
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donandrobin
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PostPosted: Sat Aug 18, 2012 6:51 pm    Post subject: 1974 AH 1600cc engine just not running right Reply with quote

I've got a 74 super beetle with the AH 1600c engine (not fuel injection)... and it keeps wanting to stall when driving it, when you come to a stop.

It's been doing it since I got it not too long ago, and I've replaced the coil, wires, plugs, rotor, cap, oil... (coil gets really hot too, not sure if I need a resistor for it). Have 009 distributor. Only things not replaced is the points and the condenser... when it's cold it runs great but after it's warm it starts to sputter and pulse to higher and lower rpms and then die when idling. Driving it is otherwise ok.

Timing is 7.5 before TDC and the timing was done at 900rpm (or as close as possible)... again, when cold no problem, but once it's warm...

Could it be an air leak? I've checked all the plugs on the carb and none of them let air through. (anyone know where to get those plastic covers by the way? i have little hoses with screws in them).

It's tough to pull the e-brake and give it has everytime I come to a stop!

Don
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Clay
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PostPosted: Sat Aug 18, 2012 7:33 pm    Post subject: Reply with quote

Blow out all the jets in the carb? There's one on the right side of the 34 pict3's that will cause the engine to stall when idling if it's plugged.
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donandrobin
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PostPosted: Sat Aug 18, 2012 8:37 pm    Post subject: Reply with quote

No I haven't... can you narrow down where that jet is and I'll give it a shot in the morning.

Thanks!

Don
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silas
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PostPosted: Sat Aug 18, 2012 9:38 pm    Post subject: Reply with quote

edit, misread your post
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Clay
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PostPosted: Sat Aug 18, 2012 9:45 pm    Post subject: Reply with quote

http://www.vw-resource.com/carb_41.html

Item 34, Pilot Jet

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Clay
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PostPosted: Sat Sep 01, 2012 7:51 am    Post subject: Reply with quote

Did you find the problem?
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donandrobin
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PostPosted: Sat Sep 01, 2012 9:08 am    Post subject: Reply with quote

Not yet, been working on sanding and painting it... if you have a few minutes, you should drop by! Smile
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Clay
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PostPosted: Sat Sep 01, 2012 10:25 pm    Post subject: Reply with quote

I'd love to, but I'm out in Ottawa these days!

Looks like it's coming along nicely though Smile

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hawthorne
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PostPosted: Wed Sep 05, 2012 10:56 am    Post subject: Reply with quote

although in this warm weather i wouldnt think this would be it but... is your pre-heat tube on your intake heating up and not totally clogged? the intake could be iceing up. and giving the carb/jets a clean like mentioned would be a good idea too.
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donandrobin
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PostPosted: Wed Sep 05, 2012 6:51 pm    Post subject: Reply with quote

Thanks for the tip... I'm going to spend tomorrow morning figuring it out. Hope it's something simple.

Appreciate all the help!!!!
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donandrobin
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PostPosted: Mon Apr 14, 2014 8:16 pm    Post subject: Reply with quote

Just a quick update to give this thread closure - I installed a new stock OEM carb I got from Chris, and I've never seen my bug run so well. It starts every time (still a little hesitation, am I supposed to give it a pump of the gas pedal if it's cold or should it just start? My 73 bus just starts instantly every time...), and most importantly, does not stall at stops AT ALL. It just keeps running... it's almost surreal, I'm used to feathering the gas pedal to keep it running for the first 20 minutes or so of driving.

I think I may try out the electronic ignition, I've read that helps with starting and overall performance. Correct me if I'm wrong.
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Clay
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PostPosted: Mon Apr 14, 2014 8:29 pm    Post subject: Reply with quote

A pump of the gas pedal will reposition your choke so the engine warms up properly...
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donandrobin
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PostPosted: Mon Apr 14, 2014 8:30 pm    Post subject: Reply with quote

Hi Clay, ok, that's what I thought. It sure runs great now!!
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68IIIbuggy
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PostPosted: Tue Apr 15, 2014 8:18 am    Post subject: Reply with quote

It's amazing what a difference a new carb can make. After I put one on my bus a couple of years ago it made me realize how most of the starting/running issues I've had with Vws over the years have been caused by 40 year old worn out carbs. I fired my bus up yesterday for the first time in a couple of months. It fired up instantly, and idled perfectly from cold.
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Busaddict
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PostPosted: Tue Apr 15, 2014 9:49 am    Post subject: Reply with quote

"It's amazing what a difference a new carb can make."

Yes, having carbs professionally rebuilt with new bushings made a huge difference for my buses. Several years on they're still top notch. Quick starts.
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