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82_CUTTINGEVERYTHIN 02-25-2013 08:17 PM

my car idles high
my car idles high when i drive it .. sometime it idles perfect and sometime it goes high .. any suggestions ?? - chevy 350, headers, 4 barrel carb, cam -

DoubleVision 02-25-2013 08:28 PM

Check the mechanical advance in the distributor, if it's developed a sticky spot, it can stick with the timing advanced a ways causing a high idle.
Also check for excessively worn primary throttle shafts on the carb.

82_CUTTINGEVERYTHIN 02-25-2013 09:07 PM

mechanical advance ? .. the wires to the spark plugs or are there other wires to the distributor ??

cadillacdave1 02-25-2013 09:45 PM

Also check the return springs on the carb throttle. If the spring is weak or binding on something it can also cause a high idle.

poncho62 02-26-2013 04:24 AM

The mechanical advance is the springs and weights inside the distributor......

Also check for cracked or broken vacuum lines.

beertracker 03-10-2013 10:42 AM

If the carb is a q-jet check the power piston spring. If the spring is too strong it will raise the primary jets at idle. More on this in cliff's book.

Make sure the secondary throttle plates are fully closed at idle. The secondary plates are closed by a coil spring on the secondary shaft. Just rebend the spring so more force is applied to the shaft. This is the problem I had on my q-jet & it took a long time to find it. :eek:

82_CUTTINGEVERYTHIN 03-27-2013 06:48 PM

Thanks to all the comments ..... I fixed the problem ...

RWENUTS 03-27-2013 07:18 PM

What was it?

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