Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
My rebuilt 84 E4ME, your baseplate. Why not return to idle, only when running?
emarkay:
It's the eBay carb someone sawed off the TV cable end.
You found me a replacement baseplate, and I finally got around to installing it on my car.
The car will not return to idle, staying at about 1400RPM and lower. As you can see in the video linked below, it is sticking only when the engine is running. Off, it returns fine - and I even have a second return spring installed. I checked all the linkages and they have slack.
http://www.youtube.com/watch?v=GPNnNCBdMJA
How much play should there be in the throttle shaft? I noticed a little bit; and occasionally a bit of fuel weeps on the choke side if I pump the throttle, engine off.
What do you suggest to do to diagnose and correct this?
Thanks again
MRK
emarkay:
The only thing I notice among the 3 baseplates I have here is that the secondary linkage on the throttle side, the one that is not shown anywhere for adjustments, allows more secondary opening than the others.
Pushing back towards rear of car, the spring loaded vertical arm on the secondary shaft, with the primary throttle linkage held closed moves about a tenth of an inch. The idle screw is set lower than normal now, and the tab is touching the screw, linkages disconnected, and choke is open on the carb in question.
On the other two it does not move at all.
Now if I crack the throttle blades on the other two, I can get those to have that same gap. This seems to indicate the linkage is messed up - but I have no specs or adjustments for this part.
On these carbs, is the lower idle limit fixed? If I back out the idle adjust screw so there's a space between it and the tab, the idle goes no lower that about 500 - I can not get to to slow and stall.
Still looking, but does anyone else on the board have an idea too?
emarkay:
OK, I need to call Cliff - I found that a full stroke on the throttle, engine off, gets a drip of gasoline from the throttle shaft area under the choke...
emarkay:
Left a message, but here's what I think is the problem:
http://www.youtube.com/watch?v=cwm7Q5BkaHc
Cliff Ruggles:
Got the baseplate in yesterday. The linkage was bent going back to the secondaries. There must be some clearance between the link and lever, which there wasn't. This puts slight pressure on the secondary throttle shaft, holding the plates open until you manually push on the primary shaft and allow them to close.
The outer spring was also bent.
We installed bushings while it was here, and bent the spring and arm back into position, good to go.....Cliff
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