Idles in park dies in drive

[Jonesy]

Here is what is happening... The truck idles fine when it is in park at about 1000 rpm, but if I put it in drive or reverse it hits about 550 and then just dies. Timing is set at 14 intial all in at 34 by around 2000 rpm. Checked for vac* leaks and there are none and I have played around with the timing and idle screw and have gotten nowhere. Any suggestons?

Here is the setup

350

air gap intake

670 street avenger

comp cam 282hr cam 1.6rr

vortec heads with a little work done

[alz]

Get a vacuum gauge and watch it when you put it in gear, is your cam timing correct ? How about your converter,is it locked up? All these things will do the same thing....just a start for ya.. http://www.s10v8.com/images/smilies/icon_wink.gif

[Jonesy]

Cam was degreed in. But I will have to check the converter. Thanks for the quick reply.

[OTHCUSTOMS]

i had that same problem...because i have such a big cam(600 roller) and combined with the converter(4500 stahl). i cant run at idel 1000, i had to boost it up to 1600 in park. in drive i idle at 900-1000. to me sounds like you need to do the same or get a bigger converter. if i was to get a bigger converter i was told i could run a lower idle in park. just too much work to drop trans again.

[Scotty_S-15]

A long shot, but maybe you\'ll get lucky and this is the problem.

......... If you\'re using the vacuum advance and have it hooked to manifold vacuum as opposed to ported vacuum, the following can happen. In neutral, enough vacuum is available to pull in the vacuum advance, which depending on other factors, can raise the idle substantially, and you\'ve adjusted your carb idle speed accordingly. BUT, pull it into gear, the RPMs drop enough to drop the vacuum substantially, which of course allows the vacuum advance to cease, which can further drop the idle substantially, and it stalls. Kind of like a snowball effect.

................. Were it me, as an experiment, I\'d disconnect the vacuum advance, set the idle speed again, and set initial advance without the vacuum to your 14 degrees, then fine tune the idle speed again. Then pull it into gear, and see if that does anything.

................... Again, a long shot, but an easy fix.





Oh yeah, another easy fix which works once in a while: Have you adjusted your idle mixture in gear? Or just give the screws an extra 1/4 or half turn and see what that does.