First drive running rough, 2.0 weber 40's |
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First drive running rough, 2.0 weber 40's |
skota23 |
Feb 20 2023, 09:10 AM
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#1
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Newbie Group: Members Posts: 35 Joined: 28-November 22 From: Madison, WI Member No.: 26,993 Region Association: Upper MidWest |
Hi Folks,
I was able to take my new to me 914 for a short drive yesterday. The car is a 74 with what I think is the original 2.0. It has Dual weber 40's and what I think is the stock distributor. The cap and rotor look practically new and the plug wire in good condition. It wouldn't start a few weeks ago and I pulled the plugs (NGK 7) and cleaned them, fired right up after that (Never had webers before and I think I flooded the cycling a little pumping the gas pedal thinking it would help start. Other observations. The few times I have started it (usually after sitting over a week) I crank the engine, and give a dab of the gas pedal to get it to fire, usually takes several tries to get. running. After warming up a bit engine goes through revs well. On the drive the engine runs very rough usually between 2-3k its barely pulling. Lots of hesitation and at odd times it pops to live a pulls great. My first thought is to pull the carbs, do a thorough cleaning and check to see what jets are fitted and the condition of the floats. Also planned are a timing check, valve adjust, oil and filter, fuel filter. Is there any other details I can provide for suggestions on how to get things running well? (IMG:style_emoticons/default/poke.gif) Thank you! Steve Attached thumbnail(s) |
nditiz1 |
Feb 21 2023, 01:59 PM
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#2
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Senior Member Group: Members Posts: 1,191 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
I don't believe anyone has mentioned how important sync is. Not only sync between the barrels, but sync between left and right side.
After they have been thoroughly cleaned and rebuilt AND timing, valves, all that is correct you can throw them back on the car. Have the linkage fully disconnected and get the car to idle with the base turn settings of the mixture screws. Once it idles you can start to sync the carbs with the syncrometer. Once you have both sides equal it is time to put the linkage back on and ensure the idle does not change because of this introduction. Both sides should still be set to the same measurements. You can then set the the throttle to different points and check both sides stay in sync. open the throttle to 1800 - 2000, check both sides, 2500 - 3000 check both sides. By doing this you will know your linkage and carbs are in sync through the throttle range. You want to make sure this is correct so you can start to tune the carbs while driving with different jets. |
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