Misfire after parking on an incline

btc-er Commited Dubber

72 posts · joined Jul 2009 · 31 Aug 2011, 4:17 pm

#859711

I've noticed that if I park on the side of a hill or across an incline so that one side of the motor is lower than the other side I get a misfire on the side that was lower for a few minutes after starting. 🙁

Is this common? Any suggestions regarding the possible cause?

1303Steve Scirocco Rare

8,650 posts · joined Aug 2002 · 31 Aug 2011, 5:40 pm

#859723

hi

Your needle and seat in the carb could be leaking and filling the cylinder up with fuel.

Steve

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 31 Aug 2011, 5:49 pm

#859725

+1 /

Happend to me. Check to see if your dipstick smells like fuel too. If you park on a hill and it leaks past the rings it will end up in your sump.

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

phatratpat Fahrvergnugen

958 posts · joined Mar 2005 · 31 Aug 2011, 7:03 pm

#859747

check oil NOW !!...once had a kombi engine detonate on me because of this...not pretty !!🙅

you can get a fuel cut off switch put in the fuel line that will stop the problem............😏

bajachris88 The international telephone dialing code for Antarctica is 6

6,661 posts · joined Apr 2005 · 31 Aug 2011, 8:30 pm

#859760

This is an awesome cut off switch i bought from poland.

One of the cheapest, and its pretty darn good quality. 12v from your coil (if mounted in rear) or 12v from brake light switch wiring for front tank mount and it will open. and of course, close when current stops.

Theres an emergency override too 👍

(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 👍
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta!

btc-er Commited Dubber

72 posts · joined Jul 2009 · 1 Sep 2011, 12:03 pm

#859823

Guy's, you're scaring me! This sounds far more serious than I had imagined. Damn that stupid empi progressive!

bajachris88 wrote:This is an awesome cut off switch i bought from poland.

One of the cheapest, and its pretty darn good quality. 12v from your coil (if mounted in rear) or 12v from brake light switch wiring for front tank mount and it will open. and of course, close when current stops.

Theres an emergency override too 👍

Did you have a link for the cut off you bought?

Lucky Phil Wolfsburg Wizard

480 posts · joined Aug 2010 · 2 Sep 2011, 8:43 pm

#859994

Could also be oil leaking into the cylinders. BMW motorcycles were notorious for it when left on sidestand after a good run.

btc-er Commited Dubber

72 posts · joined Jul 2009 · 3 Sep 2011, 8:41 pm

#860143

Have I got this right... the purpose of the cut off switch is to prevent fuel gravity feeding from the fuel tank into the carby and then into the motor? Does that mean that if I park so that the front is lower than the back I shouldn't see the problem?

If the needle valve was leaking would that mean that I would also be running rich?

Lucky Phil wrote:Could also be oil leaking into the cylinders. BMW motorcycles were notorious for it when left on sidestand after a good run.

Thanks for that Phil. How does the oil leak into the cylinders? And more importantly, how do I fix it?

So far I haven't been able to detect any fuel in the oil. It looks and smells like oil to me. But then, I'm an unreliable witness.

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 · 4 Sep 2011, 4:41 pm

#860230

I parked our Beetle on a steep driveway once, and when leaving the house after a few hours, the motor would not turn over, it was completely full of petrol. Hydro-locked. I drained about 10 litres of fuel/ oil mix out of the sump, and put fresh oil in and was able to get home.

EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 · 4 Sep 2011, 7:47 pm

#860256

btc-er wrote:Have I got this right... the purpose of the cut off switch is to prevent fuel gravity feeding from the fuel tank into the carby and then into the motor? Does that mean that if I park so that the front is lower than the back I shouldn't see the problem?

If the needle valve was leaking would that mean that I would also be running rich?

Lucky Phil wrote:Could also be oil leaking into the cylinders. BMW motorcycles were notorious for it when left on sidestand after a good run.
Thanks for that Phil. How does the oil leak into the cylinders? And more importantly, how do I fix it?

So far I haven't been able to detect any fuel in the oil. It looks and smells like oil to me. But then, I'm an unreliable witness.

Yes - To fix the symptom you should park with the wieght of the fuel downhill. IE: nose down.

That will not fix your leaking Needle and seat though.

Basically it is designed so that as the float bowl of the carby fills the float rises and hits the needle and seat valve. In a perfect world this then stops the flow of petrol.

If your valve is leaking when it is in the closed position and you park on a hill so that the overflow of the float bowl is lower than the source of fuel. The fuel will keep trickling into the float bowl, out of the overflow, down the carby throat, into the manifold, into the cylinders, past the rings into the sump and mix with your oil.

In other words a safety cut off is a good idea. but replace the needle and seat.

Nicko

62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom