new cam/running rough [Archive] - Chevelle Tech

: new cam/running rough


61dragon
Jun 8th, 03, 3:25 AM
Hi everyone,

Maybe someone can help me figure out my car. 70 BB Chevelle and put a new cam and timing chain/gears.

I tried to run her but she runs very rough. I think it might be a timing problem. She runs rough and seems to have a tendency to spurt small gas droplets out of the carberator when I give it gas.

Here's the funny thing. When I put a timing light on the balancer, I notice the timing mark is very high, nearly at the 12 o-clock mark. When I try and turn down the distributor so I can bring down the timing mark, the engine dies.

Am I missing something?

Clueless.... :confused:

Miggy
Jun 8th, 03, 8:46 AM
Well, when ever I have done this in the past, people remind me to "retrace your steps". Assuming that she ran great before you made this latest change and the real hard to re-check stuff got enough of your attention when you were changing it "like making sure your marks on the timing gears were perfectly aligned and the cam lobe grease is well applied, and you got oil up there asap, and the rocker clearance is enough to let it run". Make sure you got the wires back in the correct firing order. Bring er back to top dead center and see where the damper and distributor rotor are. (With the valve cover off you can verify you are on the power stroke, not 180 off.)

Double check the valve lash. Solids or hyd? I have tried the twist-the-pushrod-while-you-snug-in-the-rockerarm method and find that I overtightened it. Now I just use the "jiggle" method.

The old pontiacs, were notorious for timing gear issue. Right around 50k miles. They had the plastic covering on the timing gears, used to spit fuel back out when that gear is bad cause the timing was so far out.

Good luck
Miggy
69 Chevelle HT, just want to get er running so me and da wife can go to Sonic and back.(without having to PUSH IT. graemlins/waving.gif