talltony
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 posted on 26/3/07 at 11:31 AM |
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Pinto problems
Hi Everyone,
Yet again I'm having a few problems with my 2.0 pinto. Without going through the thick and thin of it all, the car was off the road for a 2
month period, I got it all okay, and then I came across a problem in that the engine would not idle. Previously it was set to 900rpm, and then somehow
it disappeared!
I don't know how this happened, all I can think of was that once a mate used the lever on the carbs (Weber twin 40s) to rev the engine.
What I did was adjust a little screw above this lever which did the trick and the engine now idles.
Now I have a problem that the engine doesn't run smoothly. It stutters slightly when pressing the loud pedal to the floor, and also seems to be
using more petrol. The most concerning thing is that when I turned the ignition off the engine continued turning over for a few seconds, sounding
rather dreadful. Then there was a final little 'pop' from the exhaust and it stopped. Any ideas? Is it overfueling?
I've also noticed that the exhaust is popping and banging more frequently and more violently upon liftoff than it used to.
Is it a simple case of the carbs need retuning? If so, where would be the best place in the York area?
Thanks for all the help 
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Mr Whippy
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| posted on 26/3/07 at 11:34 AM |
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At lease one of the jets sounds blocked and I'd check that fuel is squirting out the accelerator jets as that will cause hesitation. Have you
got a good new fuel filter on?
its not over fueling, its actually running too lean and getting very hot, thats why it can keep running without a spark
[Edited on 26/3/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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talltony
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| posted on 26/3/07 at 11:42 AM |
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Wow, I love this place. Cheers Mr Whippy, I will check the accelerator jets.
Without wanting to sound completely unknowledgeable, which indeed I am, where are they and what do I do?
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grassracer
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| posted on 26/3/07 at 11:48 AM |
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For tuning/ set up in your area...don't go past Bogg Bros at East Lutton near Malton, they did a cracking job on the 45s on my grasser last time
I was there
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Mr Whippy
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| posted on 26/3/07 at 12:00 PM |
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The Webbers have quite a lot of jets so don't just randomly remove them and don't stick things into the holes, as even a scratch will
change their performance. Like I said it sounds like more than one things blocked. To clear the mixture jet at the base of the carb (usually has a
spring coiled round it) start the car and wind it out say about 5 turns and blip the throttle then screw it back by the same amount. This should let
any dirt get past the needle. For the accelerator look down the carb, there's a bent tube in each of the barrels. Move the throttle linkage and
you should see it squirt fuel from the end of each pipe. If not then that's the one that’s blocked. Cleaning them is tricky and best done by
blasting compressed air down them. Your best to buy a manual for these carbs, as regular cleaning is a fact of life...
Fame is when your old car is plastered all over the internet
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cadebytiger
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| posted on 26/3/07 at 12:33 PM |
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How often are we talking? i have had mine running for a while now and have never cleaned them out.
I do have slight hesitation if i boot it hard sometimes.
I seem to remember also being able to stall the car if i boot the throttle full from idle with no load. I thought this was just a carb thing?!?!
Where can you get a manual from?
Rup
[Edited on 26/3/07 by cadebytiger]
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DIY Si
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| posted on 26/3/07 at 12:37 PM |
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Sounds like your accelerator jets are under sized slightly. I think Haynes do a Webber set up and tuning book.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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cadebytiger
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| posted on 26/3/07 at 12:40 PM |
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it was set up on a rolling road before i had it.
i cannot remember who by but i think they were quite well respected.
Could they be blocked?
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DIY Si
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| posted on 26/3/07 at 12:44 PM |
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Possibly. They are supposed to be the hardest part of setting up webbers, as being a fair bit out makes no real difference. Being undersized is easier
to spot than beign over. Under (or partly blocked) gives hesitation on booting it. Oversized mainly just uses more fuel.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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talltony
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| posted on 26/3/07 at 12:47 PM |
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Would the car be okay to drive for 35-40 miles? This would allow me to drive as far as Malton? I'm a little concerned that its running lean, I
guess this would do some damage long term.
Failing that, could some kind person point me in the right direction of the sorting this out. Mr Whippy - when you say I need to look down the barrel
for the bent tube that squirts fuel, is that a case of removing the filters and peering inside? And I presume that the mixture jet adjuster is
external and at the base of each barrel adjacent to the inlet manifold? Sorry for being a completely inept mechanic, I am learning quick!
Is there a website I can refer to that anyone knows of?
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cadebytiger
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| posted on 26/3/07 at 12:47 PM |
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oh right ic.
Normally if you boot it i guess you should get a real kick because you get a squirt of fuel.
Does a situation ever exist where the timming changes quickly and the fueling is not able to keep up? Or is this why you have accel jets ??
Thanks for the help!
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Mr Whippy
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| posted on 26/3/07 at 12:50 PM |
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handy link...
http://scripts.cgispy.com/forums/forum.cgi?action=index&cat=Weber_Chat&user=WebconUKLtd
[Edited on 26/3/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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cadebytiger
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| posted on 26/3/07 at 12:57 PM |
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Don't know if this helps too. Taken from the tigerownersclub
http://www.tigerownersclub.co.uk/downloads/download_files/selection_and_tuning_of_weber_carbs.pdf
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Mr Whippy
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| posted on 26/3/07 at 01:06 PM |
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I have a fab Webber manual with a huge multi carb temptation on the cover which if I remember correctly is produced by Haynes...
[Edited on 26/3/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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DIY Si
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| posted on 26/3/07 at 01:07 PM |
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Webbers respond to the differing amounts of air flowing through them, which means they take a moment to respond. This is what the accel. jets/pump are
for, to overcome the slight delay. Otherwise they are set preety much by the air demand of the engine, and therefore by rpm (roughly). If set
correctly the timing and fueling will match at all rpm points, with the accel jets takign care of any sudden throttle openings. This however is much
harder than it sounds, as the jets only come in certain sizes, so it can be hard to match all the way up the rev range. My mini was like this. My
local place had to use their strongest race jets and still drilled them out a bit to get the fueling right at the top end. A good place will get
close, a very good place should be near spot on. Hence why it costs a fair bit to get done properly.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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Mr Whippy
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| posted on 26/3/07 at 01:09 PM |
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all conventional carbs excluding piston type like vv or su etc require the accel jets and boy do you notice when their blocked
Fame is when your old car is plastered all over the internet
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Macbeast
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| posted on 26/3/07 at 01:14 PM |
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Just to confuse the issue....
Are we sure it's not the float's stuck after 2 month lay off causing overfuelling and carbon deposits causing the run-on?
A quick look at the spark plugs would settle the matter.
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talltony
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| posted on 26/3/07 at 01:32 PM |
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Macbeast, do tell more...
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Mr Whippy
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| posted on 26/3/07 at 01:46 PM |
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doubt its that as if the floats stuck then fuel will be pouring out the float chamber vent pipe
Fame is when your old car is plastered all over the internet
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talltony
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| posted on 26/3/07 at 02:12 PM |
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quote:
Originally posted by Mr Whippy
doubt its that as if the floats stuck then fuel will be pouring out the float chamber vent pipe
What does that mean
The girlfriend did comment on a slight wiff of petrol when I drove up in it. I checked everything I could think of, found no leakage or further smell.
Do I presume that I'm just worrying about nothing?
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Angel Acevedo
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| posted on 26/3/07 at 02:18 PM |
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The banging upon acceleration is more likely caused by timing or distributor problems.
You should make sure your timing is OK before tackling the carbs.
IMHO.
Beware of what you wish.. for it may come true....
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Mr Whippy
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| posted on 26/3/07 at 02:28 PM |
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quote:
Originally posted by talltony
quote:
Originally posted by Mr Whippy
doubt its that as if the floats stuck then fuel will be pouring out the float chamber vent pipe
What does that mean
The girlfriend did comment on a slight wiff of petrol when I drove up in it. I checked everything I could think of, found no leakage or further smell.
Do I presume that I'm just worrying about nothing?
well just as it sounds the fuel pump continues to pump fuel through the carbs so petrol gets everywhere, happened to my Allegro poo did it pong and
when I looked on the road there was a trail of fuel behind the car. Could have been a Back to the Future spectacular 
[Edited on 26/3/07 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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DarrenW
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| posted on 26/3/07 at 03:07 PM |
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There are some good articles on here under the tech articles section.
http://www.redlineweber.com/
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talltony
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| posted on 26/3/07 at 03:27 PM |
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quote:
Originally posted by Mr Whippy
well just as it sounds the fuel pump continues to pump fuel through the carbs so petrol gets everywhere, happened to my Allegro poo did it pong and
when I looked on the road there was a trail of fuel behind the car. Could have been a Back to the Future spectacular
[Edited on 26/3/07 by Mr Whippy]
Lol, I think it is fair to say thats not the problem then!
I will look at the jets then, that article from the Tiger website looks spot on for at least improving things. Thanks cadebytiger.
I will also have a look at the timing again. I did change the belt not so long ago, maybe I didn't do as good a job as I thought I did. It
seemed a bit easy to once I worked it out...
Thanks for your help everyone
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