Pontiac 400
Posted: Wed Jun 01, 2011 11:15 am
My brother-in-law bought a 78 Firebird with a 1966 400 motor in it, not that it matters.
As far as what has been done to it, who know's except for what we can visually see. It does have a different cam with a noticable sound to it, and it does have an Edelbrock intake and I think it's a Holley 600cfm carb.
I noticed that when he had it running, it stunk with richness, so the kid that had it prior to him had this car all scewed up so I went to adjust the idle mixture screws and didn't have too much luck.
I always thought rule of thumb was, turn them in all the way and back out 1 to 1-1/2 turns and you should be in the ballpark
Well when I turn the screws in the engine stumbles and I back it out, maybe 1/2 to 3/4 turn and the engine appears to be at it's highest point. If I go out anymore then that the engines runs rough.
Does this sound right?
Also when you go to drop this thing into gear, in park, the car idles around 1000rpm and when you pull it into gear, the car snaps and drops down to around 600/ 700rpm.
Could this be a carb issue as well? I've heard that if the car is too rich or lean (?) it will cause this.....
Any help would be appreciated and Chris, feel free to chime in buddy because this is a Pontiac we're talking about.
Thanks
As far as what has been done to it, who know's except for what we can visually see. It does have a different cam with a noticable sound to it, and it does have an Edelbrock intake and I think it's a Holley 600cfm carb.
I noticed that when he had it running, it stunk with richness, so the kid that had it prior to him had this car all scewed up so I went to adjust the idle mixture screws and didn't have too much luck.
I always thought rule of thumb was, turn them in all the way and back out 1 to 1-1/2 turns and you should be in the ballpark
Well when I turn the screws in the engine stumbles and I back it out, maybe 1/2 to 3/4 turn and the engine appears to be at it's highest point. If I go out anymore then that the engines runs rough.
Does this sound right?
Also when you go to drop this thing into gear, in park, the car idles around 1000rpm and when you pull it into gear, the car snaps and drops down to around 600/ 700rpm.
Could this be a carb issue as well? I've heard that if the car is too rich or lean (?) it will cause this.....
Any help would be appreciated and Chris, feel free to chime in buddy because this is a Pontiac we're talking about.
Thanks