2.0 Aircooled backfiring when cold

[morzov]

Got a bit of a problem with my T25. Runs fine when warm but backfires and judders when cold. Have recently changed leads , plugs, dizzy cap and rotor arm.

I'm wondering whether this is likely to be an electrical or carb problem.

Be grateful for any suggestions.

Cheers

[billybigspud]

has your thermostat failed and the van is in the fail safe position with the flaps? wouldnt cause all your probs but it can make it awkward to warm up.

[morzov]

No don't think so - I recently fixed the thermostat

[billybigspud]

was it running fine before you changed the bits?

[morzov]

I've only just changed dizzy cap and rotor -other things were changed few months back. But no it had the same problems prior to the latest changes

[Footprint]

Electric chokes functioning/set right? Central idle system enrichment device working?

Possibly low float height failing to provide sufficient fuel level? But if it runs Ok at high speed that's rather less likely.

[john1]

has your thermostat failed

Where is this guys?

[billybigspud]

has your thermostat failed

Where is this guys?

click here for all you need to know.

http://www.ratwell.com/technical/Thermostats.html" onclick="window.open(this.href);return false;

[john1]

has your thermostat failed

Where is this guys?

click here for all you need to know.

http://www.ratwell.com/technical/Thermostats.html" onclick="window.open(this.href);return false;

Thanks Billybigsud,,, I never knew that.

[morzov]

Thanks for all the replies. In the end it was one of the vacuum pipes that fits onto the top of the airbox - the end had split. Its amazing what a difference this can make.

I drove the van from Bristol to Manchester and back on Weds and it went fine.

Incidentally my thermostat had stopped working a while back - the cable had snapped. Just used a bike brake cable to fix it