SPITTING CARB - 914-6 all stock, Need assistance - please see latest post to this thread Options

[ctc911ctc]

1970 - 914-6 All stock

Got the car off the rack after a 1 year clean up documented here:

http://www.914world.com/bbs2/index.php?sho...3371&st=100

- tightened the lugs, check one more time for leaks.......

Car started first try, backed out of the driveway and went around the block

Drive strong.....very strong......

#2 cyl-carb is still 'spitting' definitely not backfiring. Chasing this through my trusty guide:

https://www.performanceoriented.com/special-procedures-1

See "notes" section

Seems that when I performed the Lean Best Idle procedure #2 failed during the procedure......the diagnosis within the document states that either the path in that carb #2 is blocked or the jet is the wrong size - my bet is a clog......though the carbs were very clean when I got the car.

There is a little noise from the right side, that in a 914-2L 4Cyl would be considered quiet, my hope is that it is not valve noise and may be exhaust leaking......did I tighten the heater manifold small nuts????? dry.gif

Carb advice sought from those that have chased a SPITTING Carb

[ctc911ctc]

UPDATE!!!!!!!


Teeners!

Your assistance in the past was very helpful, I am looking for a bit more guidance.

I have the car back together, it runs, shifts well and is a delight to drive – however it is very hard to start.

I have good compression in all cylinders with new wires, plugs, rebuilt distributor. See note below for details.

I am centering on looking at the carbs – I had them off, they were very new looking and clean. I calibrated as per the Weber specs (checking the jets, pathways, leveling of the floats, etc).

The accel pumps at each barrel are operational,

STARTING CHALLENGES

When I start the car, I pump the accelerator twice, pull the cold start accelerator handle and turn the key. The car immediately fires and then dies. I have to do this 5-10 times. The car then begins to improve and I am able to, by pumping the gas, get the engine running. When it is first running it “spits” but there are no backfires. After a couple of minutes it is as if a switch is thrown and the engine start running well. The RPMs goes from 1K to 3K. I push the starting accelerator handle back down and then the engine runs pretty good.

There is a suspicion that it is running very lean when cold (air leaks) and that when warm the leaks are minimized due to heat and the steel expanding. I have triple checked all bolts and gaskets. I leveled the headers and put a straight edge against the cam box which bolts to the headers, etc. Today I smoke tested and there seem to be no leaks below the carbs or on the carb shafts.

Today I also removed all of the jets and triple checked for debris....very clean.....

My sense of this is that the idle circuit is perhaps clogged or some other carb anomolie is treating me poorly.

Any guidance or direction would be terrific.

I believe the next step for me is to send them to Carl at Klassikats: https://www.youtube.com/@klassikats



Oh, here is a the numbers from earlier this summer: