351V6 Engine Question???

[AndrewJoey]

Originally Posted by 66Submarine

Is it just at high engine speeds, or under load?

To start off, clean or replace the points and set the dwell to spec, then check/set the timing. (Disconnect vacuum advance when you do, also make sure it's working while you're at it.) Make sure the plugs are gapped correctly. Something like .030-.035"; new plugs will be something like .055" for later HEI a lot of times, and with that big of a gap with points the engine will run poorly, or barely run at all. A bad condenser will cause ignition problems ranging from poor starting to not running at all, might try a new one, too. (Always should keep a spare condenser in the truck anyway, IMO) Check the rotor and cap and clean them up or replace them. Coils seem to last forever, so that would be at the end of my list, but could also obviously cause problems.

I like to let the engine warm up to operating temp, lean the idle out until it misses/runs poorly, then richen it up until it runs smoothly again. Another way I have used is to set for peak RPM, then leaning it out for a little RPM drop. The objective for me being to be just rich of running poorly. That's the way I set things up, going for economy.

I don't use a choke, so I set hot idle to about 700RPM. That way, by the time I get to the first stop the engine will be warm enough to idle by itself. Spec idle speed for manual trans should be 450-550RPM or something like that.

Hope this ramble helps

Higher engine speeds only.
Totally helps thankyou! I may need to get help from a friend to figure out some of what you said, but I have a place to start now.
Posted via Mobile Device