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davida

inconsistent idle

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I just installed a new weber 38 and I am having trouble getting it to idle properly. After installing a rebuilt tii distributor, blue coil, and new 38 I took the car to a professional for the final tuning. He adjusted timing and traded out some jets, and the car seemed good for the first day. Now, when I come to a stop it will idle at about 1300 rpm's, if it is a long stop it will drop to 1000 rpm's, and then finally about 500 rpm's. With the cam that I have 500 seems too low. When I adjust the speed screw I have the same problem, it just starts at about 1500 rpm's and works its way down. I have put in brand new plugs one step hotter than the W7DC, and checked the linkage to see if it was binding. Any other suggestions?

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For the first several days the choke was not hooked up at all, I just hooked it up yesterday, with no change. The timing is set at 18 Degrees.

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Read "ignition coils myths busted" on the front page then throw your blue coil in the garbage. Going back to my original coil with the 38 helped tremendously. Good luck.

Chris J

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revisit the ignition timing - set with ball mark in inspection hole at 1500 rpm

revisit your valve clearance COLD - set to 0.007"

revisit carb idle jets - remove and blast out with carb spray cleaner

adjust idle mixture, and idle speed, make sure the throttle linkage is permitting the throttle plate to close

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Is setting the timing using the ball in the hole method still the best way to set the timing? With a different carb, different cam, and a tii distributor, would that still be accurate? My mechanic set the timing at 18 degrees, should I adjust this? I always assumed if it was a timing issue I would have a consistent problem.

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Is there a way to check or adjust this without removing the distributor?

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Check timing again, it seems too far advanced at idle. You should get about 29 degrees from the front pulley or about 30-32 at the ball on the flywheel with the tii distributor at 2900rpm or so.

Also check for a vacuum leaks, check the four nuts that hold the carb to the manifold, they could need a little tightening.

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Thanks, I'll check for vacuum leaks, and I guess I should invest in a good timing light.

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