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Aircooled Mechanical Tech A Q & A Forum devoted to Aircooled Mechanical Issues. Got a problem? Then ask in here. Please, no 'For Sale' or 'Want To Buy' ads, plugs for your 'business', links to 'for sale' ads or Ebay links to your (or your mate's) auction (use the VZi 'Classifieds' section) - this also includes thinly veiled 'What's My Car Worth?' threads and "Who Can Sell Me A . . ." posts. |
27-03-2020, 03:32 PM
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#1
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Wannabe Chat Slut
Join Date: Nov 2004
Location: Midlands
Posts: 749
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Hot starting difficulty.
Got a slightly odd issue going on with my 1500 s/p Bug:
- Cold starting is perfect - immediately cranks into life and runs fine.
- Drive until the engine is hot - switch off and then the car will start fine immediately.
- Leave it for 5-10 minutes and then the car is really reluctant to start - smells and feels like over-fuelling and it will eventually catch if cranked over long enough.
What I've tried: - Check electric choke working correctly
- Check fuel pump working correctly
- Check fuel is clean, no debris in bowl
- Blow through all jets
- Check float/fuel level
- Check cut-off solenoid it moving
- Correct jets in carb
- Timing etc all correct
Carb is a genuine, refurbed Solex PICT and the car has previously had no issues, but has seen very little use over last 1-2 years.
I've set the fuel level in the bowl actually lower than spec - 15mm - as it just feels like its overfuelling, but it made no difference.
I'm thinking maybe faulty needle valve allowing the carb to over-fill when standing?
Any other ideas?
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27-03-2020, 10:29 PM
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#2
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I really must get out more
VZi Member Sponsor
Join Date: Mar 2007
Location: Black Sticks, Darkest Lancashire
Posts: 6,509
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VW recommended a "technique" for starting a hot engine. Whilst cranking, slowly press the throttle pedal all the way down, and keep it there.
Worth a try before dismantling anything.
__________________
Nothing is foolproof to a sufficiently talented fool
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27-03-2020, 11:19 PM
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#3
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Help! I'm trapped in here
Join Date: May 2002
Location: Thornton, Lancashire, UK.
Posts: 13,428
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One of Moby's pics -

Dave.
__________________
Mk 2 Scirocco 1600 GT new clutch kit
Mk 4 Golf front brake discs & pads new in box (288 mm) - Collect for free - I need the space - PM me.
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28-03-2020, 01:12 PM
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#4
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Help! I'm trapped in here
Join Date: Dec 2001
Location: Sheffield
Posts: 21,303
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It's funny as when I learned to drive, my father taught me to press the pedal once, then half press and hold b4 starting. Guess it's always served me well  tho now redundant with everything modern except my rav4 which needs it too
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28-03-2020, 01:55 PM
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#5
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Wannabe Chat Slut
Join Date: Nov 2004
Location: Midlands
Posts: 749
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Cheers Guys, understand the advice but this is a new condition - prior to being parked up for a while the car has always started easily, hot or cold, and I’m not doing anything different....
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28-03-2020, 02:40 PM
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#6
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I'm not an addict... honest!
VZi Member Sponsor
Join Date: Sep 2008
Location: The Deep South
Posts: 4,707
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CO adjutment?
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28-03-2020, 06:40 PM
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#7
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Wannabe Chat Slut
Join Date: Nov 2004
Location: Midlands
Posts: 749
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Quote:
Originally Posted by Hoosier
CO adjutment?
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Hmmmm...could be. Although the weird thing is the car has to be left a few minutes after running before the issue occurs. If the mixture was way out, sure the choke could mask it when cold starting but as soon as the choke came off I'd expect to start seeing the issue?
Or am I missing something...?
I think I'll order a new needle valve and see what difference that makes...cheap enough, and you never know.
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28-03-2020, 10:23 PM
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#8
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Chat Slapper
Join Date: Sep 2016
Location: Cambs
Posts: 353
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Quote:
Originally Posted by Blue72
Got a slightly odd issue going on with my 1500 s/p Bug:
- Cold starting is perfect - immediately cranks into life and runs fine.
- Drive until the engine is hot - switch off and then the car will start fine immediately.
- Leave it for 5-10 minutes and then the car is really reluctant to start - smells and feels like over-fuelling and it will eventually catch if cranked over long enough.
What I've tried: - Check electric choke working correctly
- Check fuel pump working correctly
- Check fuel is clean, no debris in bowl
- Blow through all jets
- Check float/fuel level
- Check cut-off solenoid it moving
- Correct jets in carb
- Timing etc all correct
Carb is a genuine, refurbed Solex PICT and the car has previously had no issues, but has seen very little use over last 1-2 years.
I've set the fuel level in the bowl actually lower than spec - 15mm - as it just feels like its overfuelling, but it made no difference.
I'm thinking maybe faulty needle valve allowing the carb to over-fill when standing?
Any other ideas?
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Have you tried unplugging choke;
had this on our 1200 was told to do; fit a non return valve on fuel line and a cork gasket under carb, never understood how this changed things but it worked. 
Also always slowly push accelerator to floor on both our aircooleds anyway.
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31-03-2020, 02:28 AM
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#9
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Chat Slapper
Join Date: Nov 2012
Location: Honolulu, Hawaii
Posts: 427
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If none of the above suggestions have worked satisfactorily, you have a start circuit wiring resistance problem or a bad ground. A faulty coil is also a small possibility.
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31-03-2020, 11:37 AM
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#10
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Seasoned Chat Slut
Join Date: Feb 2005
Location: cleveland
Posts: 2,927
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Coil or condenser breaking down
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