buckers
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| posted on 8/9/05 at 04:15 PM |
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Twin Choke Weber
Hi,
I suspect my twin choke weber carb on my pinto 2.0 is playing up. Drives fine until I demand full power, then it delivers it fine, but as soon as you
reduce power, it misfires like hell. It chucks out black smoke, and is a real struggle to keep the engine running, on however many cylinders. Nursed
it home on several occasions. Is it possibly the second half of the carb sticking open. I have taken it apart and it looks ok, but I don't
really know what I'm looking at......
Any ideas?
Buckers
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britishtrident
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| posted on 8/9/05 at 04:17 PM |
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Could it be a crankcase breather problem, when you lift off it is sucking in a very large slug of oil.
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buckers
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| posted on 8/9/05 at 04:30 PM |
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How would I be able to tell if its sucking the oil in? Oil consumption doesn't appear to have increased.
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nick205
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| posted on 8/9/05 at 04:34 PM |
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If there's black smoke it suggests an oil problem somewhere. Have you got the crankcase breather valve (underneath the inlet manifold) connect
to the inlet manifold?
Nick
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buckers
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| posted on 8/9/05 at 05:18 PM |
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There is a pipe which connects in a sililar location to the one you describe, which appears to be a loose push fit, at the engine end. It can easily
be pulled out. The other end does, I think, go to the inlet manifold.
Will examine a bit more when it stops chucking it down.
regards
Buckers
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Bob C
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| posted on 8/9/05 at 08:29 PM |
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I thought oil gave grey smoke & running rich black... ???
Bob
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MikeRJ
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| posted on 8/9/05 at 09:16 PM |
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quote:
Originally posted by Bob C
I thought oil gave grey smoke & running rich black... ???
Bob
Over fueling is certainly black, oil gives a blue ish smoke.
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NS Dev
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| posted on 8/9/05 at 09:25 PM |
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correct.
black smoke is not normally oil!
You are overfuelling as you suspected.
What carb is it? You want a "32-36 DGAV" marked on the side of the carb (or a 38 dgas but that's unlikely)
If you don't have these you probably have a vacuum secondary carb from a sierra (where the second throttle butterfly is opened by a vacuum
canister on the side of the carb)
If so, get a 32-36 dgav, they are better beyond words!!!!!!
the vac sec isn't worth pratting about with, bin it and get a dgav and it'll be fine.
If it already is one, check that the float needle valves are sealing and the float levels are ok and the floats are not holed and sinking. most common
cause of flooding is too much fuel in the chamber. If you put a kink in the fuel pump feed pipe (assuming mech pump) when it is running crap and it
clears then it's flooding the chamber for one of the above reasons.
try that lot and then come back
[Edited on 8/9/05 by NS Dev]
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buckers
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| posted on 9/9/05 at 01:29 PM |
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Hi,
Checked on the carb that's already fitted and misbehavin'. It's a 32 34 DMTL, and I have posted piccys in my archive.
Is the 32 36 DGAV a direct swap for mine. (Haven't a clue what the difference is!!)Seen prices from around £60 for secondhand.
What could this 32 36 have been on in a former life, could it literally be anything, which I presume would then require new "jets"
inside.
Will carry out running checks when it stops chucking it down........(no roof on car yet...........)
Cheers
Buckers
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NS Dev
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| posted on 9/9/05 at 02:31 PM |
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Hmm, not sure but it looks like a mechanical secondary carb, the one you have now.
Worth checking the other items next before changing it then.
Not 100% sure whether it's a direct swap. There were 2 different pinto-weber manifolds and I think yours might be the smaller one, but I'm
not sure I have to say.
A 32-36 dgav was fitted to early 2.0 sierras, 1.6 and 2.0 cortinas and 1.6 and 2.0 capris, amongst other things.
You should be looking at around £50 for one complete with pinto manifold I would say, less without the manifold.
If you find a carb cheap then get it, 50/50 it may or may not fit your manifold!!!!
check the rest on your std carb first though
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