misfire

bikecrazy Casual Dubber

24 posts · joined Sep 2010 · 9 Mar 2011, 4:12 pm

#830021

ive got a misfire on the beetle 1600 twin port ive replaced dissy cap leads plugs it seems to idle ok but as soon as you give it some revs it pops and farts and carries on

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 9 Mar 2011, 5:01 pm

#830031

Hi
check the carby isn't leaking...
or any black smoke near one of the 4 exhaust ports or heater boxes or where the exhaust fits onto the muffler...

also check the rubber boots on the inlet manifold.... and the
heater up riser pipes going under the carburetor manifold for leaks...

also check Your Distributor rotor to see how much play is in the distributor shaft... in case its moving round..

air leaks really make a VW engine play up....

distributor cap located on the dissy correct...

wipe around the coil terminals with methylated spirits
I also do inside My dissy caps too...

Best of luck

LEE

it could also be the accelerator pump diaphram in the carby...

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 9 Mar 2011, 5:18 pm

#830037

Is it a new developement? as in the car was driving fine and just started doing it? or something you're trying to get running thats been laid up/pulled apart?

Pull the aircleaner off and look down the throat while giving the throttle a pump.
Make sure the discharge tube of the accelerator pump shoots a jet of fuel down the throat.

bikecrazy Casual Dubber

24 posts · joined Sep 2010 · 9 Mar 2011, 5:53 pm

#830044

carby is fine
inlets are fine
was running ok then started playing up which i when i tested plug leads and replaced the two that tested bad

bikecrazy Casual Dubber

24 posts · joined Sep 2010 · 9 Mar 2011, 7:11 pm

#830061

ok update runs fine and revs fine when cold only plays up when it gets warm

DubbyFan Wolfsburg Wizard

518 posts · joined Nov 2010 · 13 Mar 2011, 6:09 am

#830508

Mate maybe you have her sorted by now, just my ten cents worth, coil or something that some people don't often check because they don't often play up, ballast resistor off the coil.
(If it is a ballast resistor coil that is?)

dubai Seriously Crusin Dubber

161 posts · joined Oct 2009 · 16 Mar 2011, 9:15 pm

#831003

I might be wrong but could you have the firing order wrong? check that the leads are in the right place?
and your timing

Thanks

bikecrazy Casual Dubber

24 posts · joined Sep 2010 · 13 Apr 2011, 9:28 pm

#835616

thanks for yourhelp guys wht fixed it was geting it out on the road and really driving it 🙂 damn carbon

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 14 Apr 2011, 11:01 am

#835675

bikecrazy wrote:ok update runs fine and revs fine when cold only plays up when it gets warm

Would have just been a piece of crap blocking the idle jet doing that.
They run sweet till the auto choke starts to open.

If its running fine now hopefully it's dislodged and carried on its way.

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 14 Apr 2011, 12:13 pm

#835685

GOOD LUCK

LEE

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---