help
 

ok car slows down 3 tenths changed trans and converter no change leaked motor down no problems compression also good changed coil and plugs no change valve springs are fine checked power and ground at msd box no problem changed msd box no change. please send me down the right path. vehicle is 340 low compression engine thanks

Re: help
 

also checked fuel pump and pressure and changed fuel no change

Re: help
 

Brake dragging? Sucked intake gasket? Changed fuel? (I ran out of my Sunoco blue this weekend, bought VP 110 at the track and lost .15!) :eek: Secondaries opening?

Try replacing the diaphragm in the regulator. I've heard of them doing the 'gas can test' just fine, but still not working properly downtrack under a load.

Re: help
 

Throttle cable adjustment, opening all the way? Try swapping the whole carb as that could eliminate a few potential possiblities. Bolts tight?

Is it through the whole range, launch (60' & converter flash) to finish (mph)? How much is the weather different between the last good run and when the problem showed up? Anything different with the air filter, filter base, etc.? Same weight?

How old are the plug wires, cap & rotor?
Batteries & alternator putting out good voltage to everything?
Check battery terminals for corrosion.

Distributor leads tight? I had a wire start wiggling out of the plastic connector, shut the motor off and wouldn't restart. But it could cause an intermittant miss down track.

Sounds like it has to be something simple.

Re: help
 

thottle is opening all the way and so is door its slow all the way through down across the ticket doesent miss a beat just feels flat batterys test fine cap rotor brand new wires about a year old i checked dist leads clean and tight and they ohm good

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Checked oil for metal.Might be wearing cam lobes?

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By chance are you running a clutch fan for cooling?

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Check the balancer and ensure that the outer ring hasn't spun on the inner hub. If thats happened, it obviously would show incorrect ignition timing. I got burned on that one many years ago.

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Could it be a bad timing chain ?
Ours slowed down .15 in a week with no changes. Nothoing else seemed unusual until the timing chain broke. When the mess was cleaned up and timing chain replaced it was all back to normal.

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no clutch for cooling fan i just ripped the timing cover off looks fine as far as the cam lobes lash was fine cam looks like new also has shubecks checking dist leads now