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stevecarrcross
Alfasud
Joined: 25 Aug 2013
Posts: 28
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 Posted: Tue Sep 24, 2013 9:35 am Post subject: any ideas |
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Ok
Have Compression with the finger test?
waiting for my official tester to come so i can do a proper test (what would you expect)
have fuel
have spark
but when i remove the lead the engine doesnt miss fire unlike with the other three cylinders
running twin 45's (is it poss flooding the engine with fuel on that one cylinder?
any ideas
Steve |
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Oggie
Green Cloverleaf
Joined: 06 Mar 2008
Posts: 811
Location: Whitehill
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| Posted: Tue Sep 24, 2013 8:09 pm Post subject: |
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Blocked idle valve, quite common among the webber carbs. Are you using twin 45 Idf's on a 1300cc engine? seems perhaps a tad too big unless you have re-jetted to suit.
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PHAT 33 |
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Brit01
Gold Cloverleaf
Joined: 24 May 2010
Posts: 665
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| Posted: Tue Sep 24, 2013 9:10 pm Post subject: |
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compression finger test??
Literally?
even 50 psi would blow your finger off the hole and 50 psi will not fire.
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S2 33 1988 1.7 QV
Dellorto DRLA40 (32mm venturi) |
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eagle3
Alfa 33
Joined: 11 Nov 2007
Posts: 402
Location: France
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| Posted: Wed Sep 25, 2013 4:59 am Post subject: |
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| Oggie wrote: |
| Blocked idle valve, quite common among the webber carbs. Are you using twin 45 Idf's on a 1300cc engine? seems perhaps a tad too big unless you have re-jetted to suit. |
I think they're Dellortos but yes not original.
Not quite sure what you mean by
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| but when i remove the lead the engine doesnt miss fire unlike with the other three cylinders |
I would check compressions(could be one timing belt(usually right bank) one or two teeth out of sync) and ignition timing first. Firing order 1 3 2 4. If that's ok probably a carb issue.
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Alfa33 QO 1984
Alfa33 1.3i.e. 1994 |
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stevecarrcross
Alfasud
Joined: 25 Aug 2013
Posts: 28
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| Posted: Wed Sep 25, 2013 6:36 am Post subject: |
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When I remove each lead individually the engine drops as its only firing on the other three cylinders with the faulty one there is no change in engine note hence mowing its not firing,
I think the engine has had work done on it as like you say 45's would be far too big
Waiting for compression tester to arrive |
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stevecarrcross
Alfasud
Joined: 25 Aug 2013
Posts: 28
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| Posted: Wed Sep 25, 2013 6:37 am Post subject: |
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| Ps it's the cylinder closest to oil filler back left if looking from gearbox |
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johnboy
16 Valve
Joined: 26 Jun 2003
Posts: 1061
Location: margate U.K
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| Posted: Wed Sep 25, 2013 7:01 am Post subject: |
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Morning
If there's no change in revs when you pull the lead , then there's on spark or fuel! Recheck your lead and plug
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stevecarrcross
Alfasud
Joined: 25 Aug 2013
Posts: 28
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| Posted: Wed Sep 25, 2013 7:57 am Post subject: |
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have checked spark, and its good and strong
and plug is wet when you take it out,
im thinking too much fuel is just flooding the spark out |
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johnboy
16 Valve
Joined: 26 Jun 2003
Posts: 1061
Location: margate U.K
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| Posted: Wed Sep 25, 2013 8:44 am Post subject: |
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Very strange  Have you tryed turning the jets in a tiny amount?
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WODA WE NEED? MORE POWER!!
Alfa gt jtdm blackline
1990 S2 16v veloce sleeping!
2002 ts gtv the wifes now
1997 seadoo gsx 800
1999 freestyle superjet |
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Brit01
Gold Cloverleaf
Joined: 24 May 2010
Posts: 665
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| Posted: Wed Sep 25, 2013 2:34 pm Post subject: |
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sounds similar to my recent issue.
When I checked compression it was very low so it was not firing properly. Had fuel and a good spark.
Have you changed the spark plug?
When its running what do you see down the barrel? fuel is coming out?
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S2 33 1988 1.7 QV
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eagle3
Alfa 33
Joined: 11 Nov 2007
Posts: 402
Location: France
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| Posted: Wed Sep 25, 2013 4:07 pm Post subject: |
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It could still be the timing belt. Won't know until compression test.
If the belt's out by a tooth the compression on one of the two will be appreciably lower. The other one on that bank may still have enough compression to fire.
I wouldn't mess with the carbs until compression and ignition has been checked.
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Alfa33 1.3i.e. 1994 |
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Thu Sep 26, 2013 1:38 am Post subject: |
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Hi
Years ago a 33 I know of had the timing belts replaced by a dealer with one bank being 1 tooth out. Ran remarkably well.
As to the carbs, that does sound a bit big. Car jetting (that I could find) is listed here:-
http://www.alfa-pages.co.uk/carbjet.php
All the best
Keith
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JeremyC
Gold Cloverleaf
Joined: 06 Sep 2008
Posts: 583
Location: Petersfield, Hampshire
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| Posted: Thu Sep 26, 2013 8:20 am Post subject: |
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Yes when Adie Hawkins did my belts he found that one of them was out by a tooth and it ran fine. It had either slipped or been built like this at the factory!
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eagle3
Alfa 33
Joined: 11 Nov 2007
Posts: 402
Location: France
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| Posted: Thu Sep 26, 2013 8:53 am Post subject: |
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Ok. Two teeth maybe? 
There must be some difference in compression surely.
If the carb was flooding you'd expect both cylinders to be affected no?
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Thu Sep 26, 2013 12:57 pm Post subject: |
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Hi
If the belt were out it would affect both cylinders on that bank. Go too far out and it will bend the valves.
I must admit with the carbed engines whenever I had a misfire of any kind I tended to swap the plugs, distributor cap, rotor arm and HT leads before bothering to look anywhere else (had a misfire with the Maserati once and went to do the same until I found out a distributor cap was around £250, and a rotor arm a further £95  ).
All the best
Keith
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eagle3
Alfa 33
Joined: 11 Nov 2007
Posts: 402
Location: France
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| Posted: Thu Sep 26, 2013 1:35 pm Post subject: |
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| Admin wrote: |
Hi
If the belt were out it would affect both cylinders on that bank. Go too far out and it will bend the valves.
All the best
Keith |
Yes of course the pistons will eventually touch the valves. Both cylinders are affected but one more than the other.
Look here. French forum but hopefully you'll get the jist. Two teeth out but no damage done apparently. Note compressions. http://www.carb.fr/forum/viewtopic.php?f=34&t=10827
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Admin
Site Admin
Joined: 19 Feb 2003
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Location: Stafford, UK
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| Posted: Thu Sep 26, 2013 5:22 pm Post subject: |
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Hi
It shouldn't affect one cylinder more than the other. They both should suffer the same ill effects.
All the best
Keith
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