87 cab project - First job the Carby,,

[pi22a]

Gday all,,

Finally got myself a Mk1 to play with - 1987 cabriolet 1.8lt 5sp man, pretty good condition but its coughing and spluttering (on deceleration) and runs on after shut down. Has a standard carby / air filter and I'm debating changng to a weber setup or keeping it stock (will be a daily driver so not really concerned with performance).

Anyone got some advice to stop it running on after shut down? (still waiting on a manual I got off the net). Help greatly appreciated,,

I've read a few threads on adaptors / webers and still have to work out what is the best weber carby to use. Would prefer one with auto choke that is good for city driving,, and ideas?

Otherwise I'll stick with the standard carby and do my best,,,

And yes I'm looking for new mags,,, the 3 spoke ones really suck!!

Cheers for help
Daaaave

[syncro]

Try 98 fuel to stop the run on.

[The_Hawk]

Try 98 fuel to stop the run on.

And some octane boost as well. Something to hopefully clean up any carbon buildup in the cylinders which can cause run on.

[pi22a]

Ah thanks for the tip, will give 98 & boost a go,,

[brackie]

I'm not familiar with the carby on that car (diesels don't have them ) but it'll probably have a cutoff solenoid to prevent running on. Check it's working.

[Tulyar]

Are you currently running a Pierburg 2E2 Carb?

If so how do the engine revs sit throughout cold start up until engine warm? Do they sit for any prolonged period over say 1200rpm?

In addition is there any evidence that the engine is running slightly rich (sooty plugs etc)?

[pi22a]

I put 98 & octane boost in and there was instant improvement, still runs on a bit but not too badly.

Auto choke has been disconnected, no manual choke so cold start is pretty hard, idle is around 8-900 after warm up. I'll have a look at the plugs in a sec but it still gurgles on decelaration (no backfire thankfully) so probably running rich, need to check timing too (waiting for manual) & cutoff solenoid (once I find it,,)

Carby is the pierberg, not sure which one though (will get a pic later)

cheers
daaave

[Tulyar]

If its a 2E2 it will be stamped "2E" on the upper side of the casing.

The fact that the auto choke is disconnected points to choking problems. Slightly rich running would point to the waxstat holding the choke on slightly. They probably thought it was the autochoke that was defective when it was in fact the waxstat! Put a new waxstat on and reconnect the autochoke and it may actually work properly! Its fooled many an experienced mechanic. The autochocke is otherwise reasonably reliable - if you remove the autochoke cover assembly there is a bimetallic strip in there with a bit of curly wire - its really fragile and breaks really really easily - if its intact I'll lay money the autochoke is ok.

Over run and rough running on deceleration are classic 2E2 waxstat symptoms.

Its not a reliable treatment but Ive reset a couple by dropping them in a pan of boiling water treated with anti boil mix. If you are going to replace it it might be worth a shot but get the water really hot. The waxstat is very easy to remove - you unscrew the two screws and it should with gentle pursuasion pull out, if its a 1987 car it should have been replaced at least twice in 20 years.

[roccodingo]

Dave, I have just stripped 2 cabrio's if your in need of any spares.

PM me if need be