What causes an air cooled engine to backfire?
Backfiring through the carburetor is often caused by improper ignition timing, crossed spark plug wires, or an intake valve that is stuck open. This condition is often caused by leakage of air into the intake manifold, resulting in a lean fuel-to-air mixture.
How do you adjust a Solex 34 PICT 3?
Go back to the Volume Screw and adjust it slowly for the fastest idle. It should not be much outside the range of 2-3 turns (½ turn in/out from the 2.5 basic setting). Then turn it very slowly IN until the revs drop by about 30rpm.
What should be the temperature of an air cooled VW?
180-210: peachy. 210-250: you can probably live with it; many busses w/ type4 engines get that hot under load in the summer. (For a beetle, I’d be concerned, though.) 250-280: something is wrong and must soon be fixed; however, the viscosity of a good synthetic oil should still be fine.
What causes a VW aircooled engine to detonate?
This engine can be prone to detonation, which can be aggravated by lean mixture and hot spots in the cylinder. I would check out timing as well. If that is not the issue, then I would be looking at the spark intensity (voltage) with a spark tester (that is adjustable to give voltage indications).
How does a 67 beetle start when cold?
Hello, my 67 beetle starts very easily when cold but if i drive it and it warms up, it is then very hard to start. Im about positive its flooded when I shut it down. I smell gas- it seems to also have the classic sysmptoms of being flooded. after I let it sit and cool down it will start right back up. The after market fuel pump pressure is 3 PSI.
Why does my VW engine back fire when hot?
When it is warm it has no power you can barely pull away, it also back fires extremely bad while accelerating. The owner seems to think the engine has recently been rebuilt.