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  #121 (permalink)  
Old 04-22-2012, 08:04 AM
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Malc - a couple more 'throw outs' - have you tried another carb? With you shoving a rag down the secondaries and having it run, albeit still not good, almost makes me wonder if you don't have an internally cracked/broken and into the vacuum passages, hence the odd vacuum readings. Cracks on an aluminum Edelbrock or Carter are pretty easy, Holleys, pot metal, harder Also - a GM normally uses manifold vacuum for distributor advance, not ported(above the throttle plates). A Chevy will not run well with the wrong advance arrangement (yes, I know that MSD specifies ported)

Dave W

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  #122 (permalink)  
Old 04-22-2012, 09:52 AM
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Iīve run it without the gas cap, also with a line from a 10 litre can to the fuel pump.
No cats.
I donīt usually run the fuel pump thatīs on there now, it delivers up to 8psi,
the other one that I removed delivers 6.5psi.
This morning the fuel pressure gauge needle was at 7 when the car shut down, it falls back to zero after a short time.

My everyday carb a 750 Speed Demon is on there, but I have tried it with my 650 Speed Demon as well.

My vac takeoff for the dist. is where itīs always been, the front port on the carb and itīs never been a problem.
I also cranked the kerb idle screw to lift the rpms but that didīnt work either.

Might do a Richard Pryor on it....................shoot the..expletive deleted.
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  #123 (permalink)  
Old 04-22-2012, 10:27 AM
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Quote:
Originally Posted by malc
Might do a Richard Pryor on it....................shoot the..expletive deleted.
Good grief - don't do that. What else are we 'diagnosing' from 4500 miles and across a big pond

I would still try another carb, if available - Demons do seem have their negatives according to a couple buddies that have trashed theirs to return to Holleys.
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  #124 (permalink)  
Old 04-22-2012, 12:46 PM
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refuse

something we have noticed is the small triangle shape foam air filters will come apart sucking the foam in the carbs.(edelbrock) causing idling problems. also put a new 750 double pumper on a 454 we built and found theres some carbs out there with problems in the metal. called holley they took numbers and sent me a new one.....
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  #125 (permalink)  
Old 04-22-2012, 06:14 PM
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Malc,
The fuel pump is not your problem.
There are only a few things that cause an engine not to idle.
1- many cylinders misfiling
2- large vacuum leak
3- dirty idle circuit in carb
4- flooding in carb
5- open secondaries in carb
6- wrong timing, either from the ignition or from the crank to cam
You must check each of these thoroughly do not assume.
Did you say that you put a towel over the carb and it tried to idle, check
your secondary throttle plates they must be completely closed at idle.
Please check these things and give a report I hate to see you go through all
this it is very fustrating i know.
Thanks, Scot
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  #126 (permalink)  
Old 04-23-2012, 12:19 PM
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EUPHORIA
MY MOTOR RUNS, ITīS FIXED.


MISERY
My own stupid mistake and my refusal to believe I had done what turned out to be such a basic mistake.
Everything Iīd done Iīd checked, except this, not once had I done it but it appears I was using a backup with the same problem and thinking because they both gave the same results they couldīnt be the source.
I got the tip through a PM, donīt know why he didīnt post it up here in this miserable tale of mechanical woe.
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  #127 (permalink)  
Old 04-23-2012, 12:22 PM
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Ah, now you all want to know what I did.

USED THE WRONG BLOODY CARB BASE GASKET.................
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  #128 (permalink)  
Old 04-23-2012, 12:41 PM
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Quote:
Originally Posted by malc
Ah, now you all want to know what I did.

USED THE WRONG BLOODY CARB BASE GASKET.................

A mega VACUUM leak !!!!!!

Chalk it all up to a learning experience (or many)

Congratulations
(now all we need is someone else to 'work with' {against?} )

Dave W
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  #129 (permalink)  
Old 04-23-2012, 12:44 PM
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Dam I feel for you man! Lot of time and $$$ spent to learn that lesson.

Hope the rest of the year goes your way
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  #130 (permalink)  
Old 04-23-2012, 12:49 PM
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Quote:
Originally Posted by stich626
how about your base gasket.. (carb to intake)
if intake has egr and plate is that gasket good, my edle intake has the port for an egr and it's blocked off with a plate, and it was sucking air..

also are you running an HEI or a seperate coil.. if you hook the coil up backwards it not idle with a msd box. it'll run but like crapola
Stitch was the first to hit it back the beginning of March
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  #131 (permalink)  
Old 04-23-2012, 01:16 PM
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Sucks to go thru all that aggravation but its good for guys reading this thread.

Thanks for following thru and posting the cure. A lot of guys wouldn't do so.
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  #132 (permalink)  
Old 04-23-2012, 01:40 PM
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Not the carb to intake gasket, the throttle body gasket, I installed the Holley
not the BG gasket.
The Holley gasket has a different hole layout and blocks the BG carbīs idle circuit.
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  #133 (permalink)  
Old 04-23-2012, 01:42 PM
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Quote:
Originally Posted by 123pugsy
Sucks to go thru all that aggravation but its good for guys reading this thread.

Thanks for following thru and posting the cure. A lot of guys wouldn't do so.
Had to, too many people had contributed and I was feeling so bad for all of you putting forward ideas that I seemed to be kicking out of play.

Appreciate all input from everyone.
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  #134 (permalink)  
Old 04-23-2012, 01:59 PM
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At least you found the problem and have it fixed.
Now go for a nice ride
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  #135 (permalink)  
Old 04-23-2012, 02:06 PM
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Got to get itīs annual "roadworthyness test" booked.
Month late and hardly any miles on it since the last one.
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