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jtheshowstoppper 01-21-2013 07:15 PM

wont idle in gear
 
ok my dad has a 68 c10 rebuilt the 283 to stock except for the cam its beefer.has headers now edelbrock intake and carb 1405 i can get it to idle fine in park but once in gear it dies checked for leaks and found none advanced the timing didnt help even double checked the timing still nothing hooked vacuum gauge not even close to what it should be at. last thing i can think of is maybe carb is to big im stumped

lhmurphy 01-21-2013 07:33 PM

Quote:

Originally Posted by jtheshowstoppper (Post 1637443)
ok my dad has a 68 c10 rebuilt the 283 to stock except for the cam its beefer.has headers now edelbrock intake and carb 1405 i can get it to idle fine in park but once in gear it dies checked for leaks and found none advanced the timing didnt help even double checked the timing still nothing hooked vacuum gauge not even close to what it should be at. last thing i can think of is maybe carb is to big im stumped

Did you try adjusting your idle speed screw? And did you check for vacuum leaks?

jtheshowstoppper 01-21-2013 07:35 PM

yeah if i adjust and raise the rpms it drops alot in gear but will barely idel in gear its a bit better but not really

jtheshowstoppper 01-21-2013 07:39 PM

im thinking maybe timing tab is off but when i line it up at 0 pistion feels all the way up

scholman 01-21-2013 07:46 PM

jtheshowstoppper,

Here is how I adjust carburetor on my chevy.

Set RPM to 800 RPM
Set timing to 12degrees advanced(that is for my truck)
with the vacuum advance disconnected and plugged.
Re attach the vacuum lines.
Then start adjusting the carburetor by screwing the mixture screws in one at a time until you can see the RPM drop 50 to 100 RPM. This makes the mixture "lean". Now adjust the mixture screws out until you achieve the highest RPM as you can for each of the two mixture screws. By this time the engine will be running too high an RPM so adjust the idle speed screw until you achieve the 800 RPM.
I think this will do the trick

Scholman

jtheshowstoppper 01-21-2013 07:49 PM

ill try that tomorrow

cdminter59 01-21-2013 09:32 PM

wont idle in gear
 
Make sure you don't have any vacuum leaks around the intake flange and carburetor base. If you have a long duration camshaft set the initial timing at 16*- 20*. Then you will have to adjust the mechanical timing to make up the difference to 36* at 3000 rpms. What is the camshaft's part number? Another reason the truck will not idle in gear is the torque converter is too tight. Find out the basic operating range of the camshaft. Say the basic operating range is 2000-6000 you will need a 2500-3000 stall converter. Here is an article on setting up the HEI distributor and your timing curve. http://www.crankshaftcoalition.com/w...EI_distributor

jtheshowstoppper 01-22-2013 09:28 AM

checked for leaks everywhere i could think of i had same problem in my impala it was cause my timing was off. came isnt big at all just a entry level edelbrock cam.

jtheshowstoppper 01-28-2013 01:38 PM

so I turned down idle plugged vacuum gauge in only got to 15hg timing set to 12degress if I advance my timing all the way to where it touches manifold and turn idle up then I get 20hg I'm stuck

Custom10 01-28-2013 03:44 PM

Some good points already, torx convertors that are too tight for the cam will cause a big drop in idle rpm when trans is put in gear from park.

What are cam specs?

Recheck TDC and the timing tab marker and the damper 0 mark align when #1piston is at true TDC compression stroke, maybe you timing is way off but it looks OK with light due to misalignment of marks.

Fuel pressure 5 - 5.5 psi no more?

1405 is 600 cfm, not too big, do the idle mixture screws actually cause and effect on the idle quality/rpm? how about on the idle vacuum wg"?

When on the road how does the thing run? does it run OK other than idle issue?

GMC boogie 01-28-2013 05:55 PM

You may have the valves too tight. 1/2 turn past zero lash when on the base circle of the cam.

jtheshowstoppper 01-29-2013 06:04 PM

fuel pressure is good double checked the lash seem ok nothing i do is working tdc is straight up or at 2:30 dad put after market timing tab on it and 0 is at 2:30

jtheshowstoppper 01-29-2013 06:06 PM

Quote:

Originally Posted by jtheshowstoppper (Post 1640243)
fuel pressure is good double checked the lash seem ok nothing i do is working tdc is straight up or at 2:30 dad put after market timing tab on it and 0 is at 2:30

Maybe cam is to big my dad lost spec sheet

jtheshowstoppper 01-30-2013 05:03 PM

originally the 283 had oil tube but he switched to eldelbrock manifold that doesnt have tube anymore and he just put a cap on the rear breather next to distributor

jtheshowstoppper 02-03-2013 12:19 AM

anybody else? stumped thinking about installing a stock cam


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