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Post Info TOPIC: ENGINE POWER


Poncho Master!

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ENGINE POWER


I GOT A 400 SBC IN MY CAR WHEN ITS IDLING IT ROUGH AND YOU CAN HEAR THE MISS IF I PUT THE TRILLE TO IT AND AND GET IT AT HIGH SPEED IDLE IT SOUNDS LIKE ITS MISSING AND BACK FIRES THROUGH THE TAIL PIPES AND BACK SMOKE COMES OUT OF IT.
WHEN I GO TO DRIVE IT AND PRESS ON THE GAS THERES VERY LITTLE POWER AND IT SHAKES THE WHOLE CAR.
WHEN I TRY TO BACK IT INTO MY DRIVE WAY ON A SLOPE IT BARELY MAKES THE IT INTO THE GARGE.
I PUT NEW PLUGS IN IT CHECKED THE TIMING PUT NEW GAS LINE FILTERS IN IT STILL CAN'T FIND THE PROBLEM ANY BODY GOT ANY IDEAS OUT THERE THANKS MARTY FROM DUNDALK  

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Canadian Poncho Superstar!

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Hey Marty,

Cracked Distributor cap, bad wires, bad coil, vaccum leaks at carb and even the carb all come to mind. When did it start acting up?

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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Polo green metallic & tan  - Bowling Green Kentucky 






Poncho Master!

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I WENT TO ORANGEVILLE CRUISE WED NITE THEN PARKED IT CAUSE I WENT TO CORNWALL OTTAWA THEN TO QUEBEC. WENT TO START TO GO TO ALLISTON LAST CRUISE GOT IT OUT OF MY GARGE WHEN I GOT TO ROAD I STEO ON GAS AND THATS WHEN I NOTICE IT THE POWER WAS GONE IT SEEMS LIKE IT WAS NOT GETTING ENOUGH GAS. I BEEN FOOLING AROUND WITH THIS FOR 2 DAYS NOW.
I WANNA GO TO SHELBURNE FALL FAIR AND CAR SHOW ON SUNDAY BUT LOOKS LIKE ITS NOT GOING TO HAPPEN

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Canadian Poncho Superstar!

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mfleury wrote:

I WANNA GO TO SHELBURNE FALL FAIR AND CAR SHOW ON SUNDAY BUT LOOKS LIKE ITS NOT GOING TO HAPPEN



Think positive, even if you can't drive the Custom Sport you can still go!  You should be able to see if the carb is jetting gasoline or not with the air cleaner off. A distributor cap and new wires are cheap enough to try, just my thoughts.

 



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Ray White, Toronto ON

1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Polo green metallic & tan  - Bowling Green Kentucky 






A Poncho Legend!

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73SC wrote:

mfleury wrote:

I WANNA GO TO SHELBURNE FALL FAIR AND CAR SHOW ON SUNDAY BUT LOOKS LIKE ITS NOT GOING TO HAPPEN



Think positive, even if you can't drive the Custom Sport you can still go!  You should be able to see if the carb is jetting gasoline or not with the air cleaner off. A distributor cap and new wires are cheap enough to try, just my thoughts.

 



I thin Ray is the right track     old cars are fuel and spark    did you buy any gas in a remote spot?

 



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Poncho Master!

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Above ideas are good plus a couple more thoughts are the coil itself also if an auto trans the modulator or vacuum lines to it..

To check your fuel supply and bypass the fuel pump, disconnect the line between the pump and carb and see how it runs on fresh fuel w/ the carb fed by a gravity feed supplied from a can suspended higher than the carb..

Good luck!.
smile.gif

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Poncho Master!

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did all that

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Poncho Master!

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carb getting lots of fuel

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Poncho Master!

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gas is from the dealer at the corner on highway 10 he goes through a lot of gas

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Poncho Master!

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Is there a chance your timing chain could've jumped?.

confused.gif

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Poncho Master!

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maybe but i don't think its the timing chain because it starts at the first klick of the key. i'm going to try your 2 items next that you mention how can you tell if your timing chain jumped a tooth or gear?

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Canadian Poncho Superstar!

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Do you have a vacuum gauge? Put it on a good vacuum source and see what it tells you.

Sounds like ignition issues like point gap or timing? Possibly poor idle mixture screw adjustment? Or accelerator pump in the carb not functioning?

It also could be the needle valve in the carb is sticking open and flooding the carb. Any strong smell of gas (you mentioned black smoke - usually means too much fuel). Try tapping the fuel inlet area - not too hard though - to close the needle valve.

Another possiblilty if you are getting no power and backfiring is that the fuel pump is faulty and is not delivering enough fuel. Can't remember exactly but I think you need 5-8 lbs pressure. If you have 4 or less you will encounter these probelms on acceleration. This can be tested using a vacuum gauge on the fuel inlet line.

Stuck valves or valve timing problems willl also exhibit similar symptoms.

Some things to consider.

-- Edited by gparis7 on Thursday 17th of September 2009 04:39:15 PM

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Poncho Master!

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thanks i decided to leave it alone for the rest bof the day and play with it tommorrow thanks

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