Hi,
I hope someone can give me an idea on this. Background: 92 RS with a stroked 454, Team G Intake, MSD 85551 distributor, MSD 6A box, MSD Blaster 2 coil, Holley modified 850 double pumper. I list these items becuase I think my problem lies in them. This is what happens. I start the car and can drive at "normal side street speeds", but as soon as I get on it the car takes off than basically quits. I think the carb is jacked up and it is flooding the motor out once I get on it. I think once the RPMs drop the cylinders just fill up with fuel and the car dies. Does this sound reasonable? I am waiting on a new 750 vac sec to come in the mail. I just don't want to be completely disappointed if I put the new holley on and it does the same thing. Anyone have any thoughts?

Thanks!
Phil

 

what size cam do you have and what is the actual motor displacement?
What size stall are you running or is it a stick?
What rpm are you ideling the motor at? Radical race motors heed to idle higher than stock, my 327 idles at 2600 rpm the power band is from 4000 to 8200 rpms.

did the carb set for any period of time? it my be gummed up?

more info please

later and

GB

rick

 

Cam is 260/268 Dur and .670/.625 lift
Its a 513
300 Stall
Idles about 1000rpm, it idls fine. It can sit at an idle for hours, the only time is screws up is if I take it for a drive and put some pressure on the motor. Then it takes off but as soon as I get off the pedal is starts puttering and stalls.
The carb is not gummed up, it has a fresh rebuild. And there wasn't any gunk on the inside.

Thanks!
Phil

 

Although this maybe off topic I hope you get everything on track and throw some nice detailed pictures up of your BBC swap.

 

I myself would take a look at the possibility of it being a vacuum leak.

 

ok Phil
these questions that you have answered


I forgot to ask did you pull a spark plug right away to see if it is flooded, or fouled?

are you running at least 11 to 1 compression for your motor?

are you using a vacume distributor? if so what kind and has it been calibrated to you motor weights and springs ect?

/Also someone metioned a vacume leak good starting point. Make sure you are useing the proper ports on the carb for vacume advanced if equiped.
Also do the intake manifold vacume test.

just for fun bump the idle up 600 rpms to see what happens. that combo will not be very street frendly with an auto tranny.

let us know

thanks

rick

 

I forgot to ask did you pull a spark plug right away to see if it is flooded, or fouled?

Yes when I had the HEI system on there the plugs were fouling, but not anymore.

are you running at least 11 to 1 compression for your motor?
11:1 is the ratio yes

are you using a vacume distributor? if so what kind and has it been calibrated to you motor weights and springs ect?
No, I have the MSD 85551 distributor with the mechanical advance

/Also someone metioned a vacume leak good starting point. Make sure you are useing the proper ports on the carb for vacume advanced if equiped.
Also do the intake manifold vacume test.
Will check the intake but I tried spraying fluid around it and no change in idle. Also, all the ports on the carb are blocked.

just for fun bump the idle up 600 rpms to see what happens. that combo will not be very street frendly with an auto tranny.
I will try to raise the idle and see what happens

I really appreciate all the help!
Thanks,
Phil

 

set the timming by ear have someone get in put ingear while running adjust and test throttel responce periodicly while adjusting get best result this way

 

Phil

i thought about this at work and here is where I would start

is there a power valve in the carb, (you will need one if you want to keep it on the street), or has it been removed? Also before increasing the idle time the motor and check the vacume for the proper power valve size, and make sure that it is the correst one.

later

rick

 

The carb has the power vavle. Here is what happened as of yesterday. The timing is set. The car starts "turn key". It idles perfectly, sounds great. Driving the car: runs great, nice hard shift going from 1st to second. Shifts at about 2200rpm (15 or so MPH). However, once I get going about 40 MPH the motor starts to mildly surge. The RPMs hit about 2000 and it sounds like it starts to sputter. Then the RPMs start bouncing between 2100ish and 1900ish. When I give it more gas the motor starts to die. If I feather the gas and then floor it the RPMs jump like the car is going to continue to run and then it stalls out. At least my battery isn't dead anymore and I can start it right back up. When the car starts up again it runs fine until I hit that 40MPH area. I am really thinking this carb is jacked up, but if anyone has any other ideas I would be willing to give them a shot. I tried spraying carb cleaner around the carb to see if the idle changed any and it didn't so I don't think there is a leak around the carb.... Anymore ideas?????

Thanks for everyone's help so far!!
Phil

 

what is base timming set at?

 

and also
I bet that is supose to be a 3000 stall not 300 right?
if so your motor is shifting before you get into the powerband.
I think you should be reving out to 5500 rpms to 6200 with that cam.
was the cam broke in before you had all these issues?

I am leaning toward carb and distributor problems. What size jets are in your carb? tell us the intinal timming please and let us know were it is at, at tip in. maybe delay the tip in I personaly would use a speed deamond carb or an 850 holley just my 2 cents
one more thing--is the modulater on the tranny hooded up and taylored to your motor combo?
later
and

GB

rick

 

I really appreciate all the time you all have put into trying to help me.
Much appreciation,
Phil

 

maybe it's a little too much carb?

 

Well, the car runs great!!! The carb must have been jacked up. I rebuilt a 750 vac secondary and put it on there. Car fired right up which was a good thing. I took it for a ride here on Fort Riley. Dodged the Military Police cats and she ran great.
Rick,
Really appreciate all your help. As far as the stall converter. I think you are right. It's flashing so I am pretty sure she ain't big enough. That project will have to wait a little while though. The bank closed on me (aka my wife).

Thanks! and i will put some pics up as soon as I download the digital camera.
Phil

 

If it drives fine when you drive it nicely, then wants to die when you stomp the loud pedal, then I'll bet you anything its leaning out really bad, causing the hesitation/stalling.

Check your accelerator pump linkages (primary and secondary) and make sure all the adjustments are within specs. Then check your accelerator pump cams... make sure they are set properly, and are the proper ones for what you are doing.

 

a simple thing too check is if you have plug wires crossed exe... 2and 4 1and 3 ect gl all i can think off

 

Here is pic number one...

 

pic number 2....

 

this one shows how STUPIDLY close my fan pulley is to my electric fan....

 

pretty much the entire engine compartment.

 

the entire car....and no my hood (Iroc Daytona) does not fit anymore. Gonna have to modify.......

 

looks like mine except t top and a lot better condition what package is the ground effects i got same curios what pack i got identical only stock no t tops and same rims

 

Dude... that carb is NOT a double pumper. Its a vacuum secondary, dual feed.

 

I know....
It had a double pumper.

Phil