slow startup?

[dstan]

Hi y'all

So, before I started monkeying with the timing, replacing the vac advance, what have you, the car would start pretty durnd well. The number of cranks would be irregular. Some times almost instantly. Sometimes maybe 5 or 7. I think the timing was at 3.7 and that the vac advance was non-functional, and that the jet was melted in half. But it would always start up in a strong way.

Now, after replacing the spark plugs, wires, cap, rotor, vac advance (which now is functioning properly), pcv valve, pcv vent tube, other crankcase tube, the jet, whathaveyou, set the timing to 7.5 (though the phenomena i'm about to describe was the same at 5.0) ---- now, the thing starts, but it seems to struggle a bit to do so. No more are there the 2 turn starts. No more does it emphatically jump to idle. Now, it cranks usually for 4 seconds or so, and then kindof struggles for a second to get going. Usually I help it get there by hitting the gas pedal to rev it a bit once I get the sense that it is starting to go.

Anyone else experienced such a change? Any suggestions? Could it just be the sea foam in the gas tank!? Runs fine...?

[takza]

Have you looked at the auto choke? You can take the top off the air cleaner COLD...set the choke and make sure it is closed...and so forth. Use carb cleaner to free it up...then some light oil.

[Petros]

With a carb engine, changes in engine temp, air temp, moisture, etc. effect how easy the car starts. The timing advance makes it a bit harder to start too, especially when cold. But after it runs for 30 or more seconds it is of little consequence, and the advanced timing will result in better power and economy.

The interface at the spark with the fuel air mixture is very unstable when cold, and the spark will not reliably ignite the mixture. When the engine warms up, there is more fuel vapor in the mix, and ignition is more reliable. The emissions also go off the scale when it is cold, and one of the reasons all manufacturers were forced to go to EFI, you get a better vaporization of the fuel when it is cold, and better control of the mixture. EFI deliver lower emissions in all driving conditions, better performance, and better economy too. And it has proven to be more reliable as well. A good reason to use it.

[Pearson]

Could someone tell me where the 2 hoses of the distribuitor advance goes? i changed my carburator and with vaccum conected its 10 degrees, i wanna know where there should be coneccted and if i dont what will happened?

[Petros]

If you plug the vac lines there is little consequence of not using them. If your vac advance is still operational, you need to connect them so at part throttle cruise (as in steady state hwy driving), it advances the spark to improve economy a bit. But if your diaphragm is bad (which is usually the case if it is just as old as the car), it just becomes another vacuum leak.

take the cap off and suck hard on the port that is on the end of the advance, if it rotates the mounting plate to advance the spark, it is good. If you can suck air through the diaphragm, it is shot. See the vac diagram posted in repair guides section for correct connection, you want them in the correct order. Some years have slightly different distributor vac advance or retard.

[Pearson]

If you plug the vac lines there is little consequence of not using them. If your vac advance is still operational, you need to connect them so at part throttle cruise (as in steady state hwy driving), it advances the spark to improve economy a bit. But if your diaphragm is bad (which is usually the case if it is just as old as the car), it just becomes another vacuum leak.

take the cap off and suck hard on the port that is on the end of the advance, if it rotates the mounting plate to advance the spark, it is good. If you can suck air through the diaphragm, it is shot. See the vac diagram posted in repair guides section for correct connection, you want them in the correct order. Some years have slightly different distributor vac advance or retard.

Thanks for your answer PETROS, lets see when i rebuilded the motor few months ago , i also repair the diaphragm so i suposed it is working, right now i have one of the vac lines going into the carburator and the other one is just not plug because i dont know where does it goes reading the manual it says that one is for advance and the other one for altitude compensation, so i just connected teh vac advance, right now i have no pimpimg problem but it feels like it doesnt develop all the power, last week i cheeked the timing and it was 10° but if i set it to 13 or more i get that pimpimg sound, so im just running the car like this to see how many kilometers do i get from gasoline. Im using 90 oct fuel. Im using 10w40 magnatec oil and it seems to work fine.