idling issue

[AUC-05L]

hi people.

about a month ago i got rid of the horrid stock carb on my 1.6L and replaced it with a 32/36 weber. it ran awsome! a few days ago i noticed that after driving it for a while when the engine reaches operating temp, the idle is all over the place.

normally it idled around 1000rpm, now it jumps from 1000, to 250 and then back up and then its prone to fall to 250 and stay there. this only happens after a 20min drive before then its fine.

it still drives the same as before, nice and smooth thru all gears, revs smoothely, its just an idling issue.

for some reason i have a feeling it might be ignition related but let me know what you guys think. after all, im new to 4 bangers!

most ignition parts have been replaced, everything but the points and condensor.

this is my daily so i'd prefer to solve this issue fairly soon as its very annoying.

also whats the best way to set the float level on a weber, mines OK but when turing right and deccelerating sharply it has a tendancy to stall. i have fiddled with it but cant quite get it, maybe theres a trick to it???

cheers
john

[Peter Jones]

Check that the carb is still bolted down.

Sounds stupid but mine rattled loose.

Symptoms you describe are usually caused by vacuum leaks.

With the stall on turning it's pretty much the nature of the beast when it comes to those webers on a MK1 because they're mounted at 90° to what they were on the Cortina they came off. Every one has issues with fast corners and these carbs.


Pete

[AUC-05L]

fair engough about the weber. i will check for vaccume leaks and see if the problem persists....

thanks pete.

[AUC-05L]

checked for vaccume leaks and couldnt find anything wrong, any other ideas??

[pepperwhite]

maybe check again! they can be pretty sneaky..

[AUC-05L]

OK, i checked all the vaccume lines, manifolds, carb to manifold with no luck.

now, the idle drop seems to be much more consistent and it stays at 300rpm, doesnt fluctuate anymore, the car feels a bit more jerky to drive at lower rpm's. im starting to think its a fuel issue. the funny thing is that when it dropped to 300rpm i turned the idle screw to make it idle a 1000rpm, then the next time i drove it it was back to 300 rpm! how does that work.

the carb im running is a 32/36 weber on a Passat manifold. new fuel filter which is nice and clean. any other suggestions???

cheers
john

[AUC-05L]

put in new points, and the problem appears solved......cheers, now to fiqure out how to stop the fuel surge in the weber.....maybe a electric pump to up the pressure a bit? any thoughts?

[Peter Jones]

put in new points, and the problem appears solved......cheers, now to fiqure out how to stop the fuel surge in the weber.....maybe a electric pump to up the pressure a bit? any thoughts?

I once spoke to a carby shop about this issue, he seemed to think it could be minimised with float settings.

I'm not sure with these if it's too much fuel or too little fuel that's the problem.

I suspect it's too much just thinking about it. Might be that the float level needs to be set lower.

Pete

[16v_kid]

just try put in electric ignition.... The same thing was doing to my golf till i got this in it.....