t25 misfire

[umgum]

i have a 1980 1600 Aircooled T3

we set off the other day to goto vwextravaganzer i filled up at asda with low sulphur petrol

we got 5 miles into the journey and the van started to misfire

i have changed plugs,leads,dizzy cap and rotor arm

drained most of the fuel and put normal unleaded in it but it is still misfireing any ideas please

[VWCamperfan]

Sounds to me like a partial blackage in the carb. Just for a quick job, take off the air filter inlet to the top of the carb, start the engine and open the throttle so the engine go to high revs. When at high revs, put your hand over the top of the carb to make a seal and to prevent air from getting in, then release the accellerator. You will feel a vaccuum on your hand, this is normal but hopefully it will suck out any blockages in the carb. Only takes 5 mins but may save time if it works.

[umgum]

thanks will give it a try tomoz

[umgum]

ok tried that it stalled the engine seems a bit better but still not right

[VWCamperfan]

Yeah, it does stall it, floods the engine... You think you've broken it for a while! If it seems better then it could well be a blockage in the carb. May need a strip down and clean including jets and emulsion tubes (the brass bits!).

[umgum]

could be my first carb strip down

[dalmationman]

Supermarket petrol is sometimes crap.

Drain and refill with good fuel.
Check your fuel filters are clean.
Take the air filter off and blow into the carb wth compressed air.

If that doesnt work, then do the carb stripdown and clean.

Check your fuel tank for holes, rust and rubbish . Also check the filler neck for holes, the ruber perishes sometimes and water thrown up from the front wheels goes into the filler eck, into the tank and then into the carb etc etc.

[umgum]

no compression in one of the chambers
so it`s engine out